Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt maraging steel, 300 grade maraging steel, AerMet 100, AF1410, S53, M54, 300M, 4340M and PremoMet. These were categorized into maraging steels, high alloy secondary hardened steels, and low alloy steels, and were then further researched.  The material with the highest combination of UTS and KIC was M54 followed by AerMet 100; while AF1410 had the highest KIC but a low UTS, and PremoMet had the highest UTS but a low KIC. Maraging steels and HASH steels have a similar price range, while low alloy steels are much cheaper.

Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m^1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt maraging steel, 300 grade maraging steel, AerMet 100, AF1410, S53, M54, 300M, 4340M and PremoMet. These were categorized into maraging steels, high alloy secondary hardened steels, and low alloy steels, and were then further researched. The material with the highest combination of UTS and KIC was M54 followed by AerMet 100; while AF1410 had the highest KIC but a low UTS, and PremoMet had the highest UTS but a low KIC. Maraging steels and HASH steels have a similar price range, while low alloy steels are much cheaper.

Neste trabalho estudou-se as propriedades obtidas em juntas soldadas pelo processo de soldagem a laser do tipo estado sólido de onda contínua guiado por fibra, e os resultados foram comparados com juntas soldadas pelo processo feixe de elétrons. O material utilizado foi o aço maraging 350 - ASTM A 538 Grade C. As soldas realizadas com o processo feixe de elétrons possuem um procedimento de soldagem aprovado. A junta selecionada para a elaboração do trabalho foi do tipo sobreposta com material de base de espessuras diferentes, respectivamente iguais a 1,00 e 0,78 mm. As juntas soldadas foram avaliadas por: ensaio de cisalhamento, dureza Vickers e caracterização microestrutural das diversas regiões das juntas soldadas. Foram realizadas análises por microscopia óptica e microscopia eletrônica de varredura usando espectrometria de energia dispersiva (MEV/EDS). Foi realizado o teste de hipótese como técnica para a análise dos dados provenientes dos ensaios experimentais. Nas juntas soldadas com ambos processos não foi verificada a presença de descontinuidades, poros e depressões na superfície do cordão. Os resultados indicam que as condições usadas em ambos os processos de soldagem foram satisfatórias e possibilitaram a soldagem do aço maraging 350 atendendo aos requisitos necessários. / In this work, the welds made by a continuous wave diode pumped solid state laser guided by fiber were studied and the results were compared with welded joints of electron beam welding. The material used was maraging 350 steel ASTM A 538 Grade C. The welding process performed with electron beam welding has a approved welding procedure. The joint chosen for the preparation of the work was the lap joint type with different thicknesses base material respectively equal to 1,00 and 0,78 mm. The welded joints were evaluated by mechanical tests like shear test, Vickers hardness and microstructural characterization of the various regions of the welded joints. Analyzes were performed by optical microscopy and scanning electron microscopy using energy dispersive spectrometry (SEM/EDS). The hypothesis test technique was done for the analysis of data from experimental tests. For both welding process was not detected in the welded joints the presence of discontinuities, pores and depressions on the weld fillet surface. The results indicate that the conditions used for both welding process were satisfactory and allowed the welding of maraging 350 steel meeting necessary requirements.

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / AÃos maraging sÃo ligas Ni-Co-Mo-Ti de ultra-alta resistÃncia e vasta aplicaÃÃo que vai desde a indÃstria bÃlica e nuclear atà componentes aeronÃuticos, vasos de pressÃo e a indÃstria esportiva. Atualmente estes aÃos vÃm sendo estudados para utilizaÃÃo em rotores de alta velocidade de motores de histerese. Os aÃos maraging apresentam algumas vantagens em comparaÃÃo a outros tipos de aÃos e ligas, pois apresentam nÃveis de resistÃncia mecÃnica extremamente elevados, excelente conformabilidade no estado solubilizado e grande capacidade de endurecer por envelhecimento. A utilizaÃÃo destes aÃos em motores de histerese à o motivo pelo qual se estudam suas propriedades magnÃticas. Para este fim, o material deve apresentar, alÃm de elevada resistÃncia mecÃnica, caracterÃsticas tÃpicas de materiais magneticamente macios. As propriedades magnÃticas do material sÃo mostradas e discutidas com o objetivo de determinar os melhores tipos de tratamento para utilizaÃÃo do aÃo nas condiÃÃes requeridas. AnÃlises de textura foram realizadas e discutidas com o objetivo de determinar a textura existente no material, bem como sua direÃÃo de fÃcil magnetizaÃÃo. As quantificaÃÃes das fases para as diferentes condiÃÃes de tratamento termomecÃnico foram realizadas por difraÃÃo de raios-X, atravÃs do mÃtodo de comparaÃÃo direta com o objetivo de analisar a influÃncia da austenita na textura, resistÃncia mecÃnica e propriedades magnÃticas do material. Ensaios de dureza foram realizados com o objetivo de analisar as propriedades mecÃnicas do material. As anÃlises revelaram que praticamente todas as amostras possuem os mesmos componentes de textura e a direÃÃo de fÃcil magnetizaÃÃo <100> apresenta-se no plano da chapa rotacionada de 45 em relaÃÃo à direÃÃo de laminaÃÃo. As propriedades magnÃticas medidas mostram que todas as amostras possuem os requisitos mÃnimos para utilizaÃÃo em motores de histerese, sendo as amostras com solubilizaÃÃo intermediÃria as menos indicadas a as amostras resfriadas em nitrogÃnio as mais indicadas para este tipo de aplicaÃÃo. / AÃos maraging sÃo ligas Ni-Co-Mo-Ti de ultra-alta resistÃncia e vasta aplicaÃÃo que vai desde a indÃstria bÃlica e nuclear atà componentes aeronÃuticos, vasos de pressÃo e a indÃstria esportiva. Atualmente estes aÃos vÃm sendo estudados para utilizaÃÃo em rotores de alta velocidade de motores de histerese. Os aÃos maraging apresentam algumas vantagens em comparaÃÃo a outros tipos de aÃos e ligas, pois apresentam nÃveis de resistÃncia mecÃnica extremamente elevados, excelente conformabilidade no estado solubilizado e grande capacidade de endurecer por envelhecimento. A utilizaÃÃo destes aÃos em motores de histerese à o motivo pelo qual se estudam suas propriedades magnÃticas. Para este fim, o material deve apresentar, alÃm de elevada resistÃncia mecÃnica, caracterÃsticas tÃpicas de materiais magneticamente macios. As propriedades magnÃticas do material sÃo mostradas e discutidas com o objetivo de determinar os melhores tipos de tratamento para utilizaÃÃo do aÃo nas condiÃÃes requeridas. AnÃlises de textura foram realizadas e discutidas com o objetivo de determinar a textura existente no material, bem como sua direÃÃo de fÃcil magnetizaÃÃo. As quantificaÃÃes das fases para as diferentes condiÃÃes de tratamento termomecÃnico foram realizadas por difraÃÃo de raios-X, atravÃs do mÃtodo de comparaÃÃo direta com o objetivo de analisar a influÃncia da austenita na textura, resistÃncia mecÃnica e propriedades magnÃticas do material. Ensaios de dureza foram realizados com o objetivo de analisar as propriedades mecÃnicas do material. As anÃlises revelaram que praticamente todas as amostras possuem os mesmos componentes de textura e a direÃÃo de fÃcil magnetizaÃÃo <100> apresenta-se no plano da chapa rotacionada de 45 em relaÃÃo à direÃÃo de laminaÃÃo. As propriedades magnÃticas medidas mostram que todas as amostras possuem os requisitos mÃnimos para utilizaÃÃo em motores de histerese, sendo as amostras com solubilizaÃÃo intermediÃria as menos indicadas a as amostras resfriadas em nitrogÃnio as mais indicadas para este tipo de aplicaÃÃo. / Maraging steels are alloys of Ni-Co-Ti-Mo ultra-high resistance and wide application ranging from the defense industry and nuclear power to aircraft components, pressure vessels and the sports industry. Currently these steels have been studied for use in high speed rotors hysteresis motors. The maraging steel have some advantages compared to other types of steels and alloys, as have levels of extremely high mechanical strength, excellent conformability in the solubilized state and great ability to harden by aging. The use of these steels in hysteresis motors is why we study their magnetic properties. To this end, the material must have, and high mechanical strength characteristics typical of magnetically soft material. The magnetic properties of the material are shown and discussed in order to determine the best types of treatment for use in the steel requirements. Textural analyzes were performed and discussed in order to determine the existing texture in the material, as well as its direction of easy magnetization. The quantification of phases for different conditions of thermomechanical treatment was performed by X-ray diffraction, using the method of direct comparison with the objective of analyzing the influence of austenite texture, mechanical and magnetic properties of the material. Hardness tests were performed to analyze the mechanical properties of the material. The analysis revealed that virtually all samples have the same texture components and the direction of easy magnetization <100> is presented in the plane of the plate rotated 45  relative to the direction of lamination. The magnetic properties measurements show that all samples have the minimum requirements for use in motor hysteresis, and the samples with the least intermediate solubilization indicated the samples cooled in nitrogen the most suitable for this type of application. / Maraging steels are alloys of Ni-Co-Ti-Mo ultra-high resistance and wide application ranging from the defense industry and nuclear power to aircraft components, pressure vessels and the sports industry. Currently these steels have been studied for use in high speed rotors hysteresis motors. The maraging steel have some advantages compared to other types of steels and alloys, as have levels of extremely high mechanical strength, excellent conformability in the solubilized state and great ability to harden by aging. The use of these steels in hysteresis motors is why we study their magnetic properties. To this end, the material must have, and high mechanical strength characteristics typical of magnetically soft material. The magnetic properties of the material are shown and discussed in order to determine the best types of treatment for use in the steel requirements. Textural analyzes were performed and discussed in order to determine the existing texture in the material, as well as its direction of easy magnetization. The quantification of phases for different conditions of thermomechanical treatment was performed by X-ray diffraction, using the method of direct comparison with the objective of analyzing the influence of austenite texture, mechanical and magnetic properties of the material. Hardness tests were performed to analyze the mechanical properties of the material. The analysis revealed that virtually all samples have the same texture components and the direction of easy magnetization <100> is presented in the plane of the plate rotated 45  relative to the direction of lamination. The magnetic properties measurements show that all samples have the minimum requirements for use in motor hysteresis, and the samples with the least intermediate solubilization indicated the samples cooled in nitrogen the most suitable for this type of application.

Submitted by SANDRO LOMBARDO null (sandro_lombardo@hotmail.com) on 2016-01-20T23:30:41Z No. of bitstreams: 1 Corr Final Tese Dout jan 2016 Jorge.pdf: 23312831 bytes, checksum: 6cc19a3de9b693fbea3cce727e0826ad (MD5) / Approved for entry into archive by Sandra Manzano de Almeida (smanzano@marilia.unesp.br) on 2016-01-21T13:06:19Z (GMT) No. of bitstreams: 1 lombardo_s_dr_guara.pdf: 23312831 bytes, checksum: 6cc19a3de9b693fbea3cce727e0826ad (MD5) / Made available in DSpace on 2016-01-21T13:06:19Z (GMT). No. of bitstreams: 1 lombardo_s_dr_guara.pdf: 23312831 bytes, checksum: 6cc19a3de9b693fbea3cce727e0826ad (MD5) Previous issue date: 2015-12-21 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Os aços Maraging são aços de ultra-alta-resistência, tem composição à base de ferro ligado com cerca de 18% de níquel, com limite de esoamento entre 1.400 a 2.500 MPa. Possuem propriedades superiores, tais como a alta ductilidade, boa soldabilidade, tratamento térmico simples sem deformações, boa usinabilidade, alta resistência e resistência ao desgaste. A sua boa tenacidade permiti que suporte tensões repetidas de fadiga por maior tempo, comparado com outros aços de alta resistência. Para o presente trabalho, a partir de diversos testes de solda a laser, aplicação de tratamentos térmicos e tratamento superficial de nitretação a plasma, foram estudadas as propriedades mecânicas através de ensaios de tração, fadiga, impacto, dureza e rugosidade. Foram também analisadas, com auxílio do Microscópio Óptico, as características microstuturais da zona de fusão (ZF), zona térmica afetada (ZTA) pelo calor da solda e camada nitretada. Com o auxílio de um Microscópio Eletrônico de Varredura (MEV) analisou-se o mecanismo da fratura e foram realizadas análises por E.D.S. (Energia Dispersiva de Raios X). Foram realizados vários teste com tempos e temperaturas para se definir a melhor condição de envelhecimento, obteve-se a temperatura de 480°C por 3 horas como satisfatoria. A solda a laser mostrou-se eficaz para a união das chapas, com perda de resistência inferior a 10%, quando comparada com a resistência do aço maraging sem solda. As análises da superfície fraturada mostram que a ruptura dos corpos de prova soldados ocorrereu na região da zona fundida, e possui natureza dúctil, com a formação de dimples, para todas as condições de tratamento térmico, o processo de soldagem e nitretação a plasma não alteraram o tipo de fratura típica dos aços maraging. A vida em fadiga não foi prejudicada pela nitretação, porém, foi observado uma redução da vida em fadiga do material soldado comparado com o material sem solda. Os resultados indicam, que o tratamento térmico de envelhecimento elevou as propriedades mecânicas do aço maraging tanto do material soldado como do nitretetado a plasma, com valores de resistência de aproximadamente 2.000 MPa e alongamento em torno de 8%. / Maraging Steels are ultra-high-strength, that have their composition based on iron alloyed with approximately 18% Nickel, with yield strength between 1.400 to 2.400 MPa. They have superior properties, such as high ductility, good weldability, simple heat treatment without deformation, good machinability, high strength and wear resistance. Their hardness and resistance allow them to supports repeated stress of longer fatigue in comparison with other high strength steels. The maraging steel has a significant cost advantage due to the good workability, predictable and uniform retraction during heat treatment, making this steel be promising. For this work, from various laser welding tests, heat treatment and surface treatment of plasma nitriding, The mechanical properties were studied by means of testing: traction; fatigue; impact; hardness; and roughness. We also analyze, with the aid of optical microscope, the microstructural characteristics of the fusion zone (FZ), the heat affected zone (HAZ) due the welding and by nitrided layer. With the aid of SEM (Scanning Electron Microscope) and EDS (Energy Dispersive Scanning), we analyzed the fractured mechanisms. Several tests were carried out with times and temperatures to determine the best aging condition and the chosen temperature was 480°C for 3 hours. The application of laser welding seems to be effective for joining the plates with loss in the yield strength or tensile strength less than 10%, compared with the strength of maraging steel without welding. The analyses of the fractured surface showed that the rupture of the welded samples occurred in the fused zone region and has ductile nature, with formation of dimples for all heat treatment conditions. The welding and plasma nitriding process have not modified the type of typical fracture of the maraging steel. The life in fatigue was not affected by nitrided, however, they observed a reduction in fatigue life of welded material, compared with no soldering material. The results showed that aging heat treatments increased the mechanical properties of maraging steel both welded and plasma nitrided material, whit strength values about 2.000 MPa and elongation nearly 8%.

Neste trabalho estudou-se as propriedades obtidas em juntas soldadas pelo processo de soldagem a laser do tipo estado sólido de onda contínua guiado por fibra, e os resultados foram comparados com juntas soldadas pelo processo feixe de elétrons. O material utilizado foi o aço maraging 350 - ASTM A 538 Grade C. As soldas realizadas com o processo feixe de elétrons possuem um procedimento de soldagem aprovado. A junta selecionada para a elaboração do trabalho foi do tipo sobreposta com material de base de espessuras diferentes, respectivamente iguais a 1,00 e 0,78 mm. As juntas soldadas foram avaliadas por: ensaio de cisalhamento, dureza Vickers e caracterização microestrutural das diversas regiões das juntas soldadas. Foram realizadas análises por microscopia óptica e microscopia eletrônica de varredura usando espectrometria de energia dispersiva (MEV/EDS). Foi realizado o teste de hipótese como técnica para a análise dos dados provenientes dos ensaios experimentais. Nas juntas soldadas com ambos processos não foi verificada a presença de descontinuidades, poros e depressões na superfície do cordão. Os resultados indicam que as condições usadas em ambos os processos de soldagem foram satisfatórias e possibilitaram a soldagem do aço maraging 350 atendendo aos requisitos necessários. / In this work, the welds made by a continuous wave diode pumped solid state laser guided by fiber were studied and the results were compared with welded joints of electron beam welding. The material used was maraging 350 steel ASTM A 538 Grade C. The welding process performed with electron beam welding has a approved welding procedure. The joint chosen for the preparation of the work was the lap joint type with different thicknesses base material respectively equal to 1,00 and 0,78 mm. The welded joints were evaluated by mechanical tests like shear test, Vickers hardness and microstructural characterization of the various regions of the welded joints. Analyzes were performed by optical microscopy and scanning electron microscopy using energy dispersive spectrometry (SEM/EDS). The hypothesis test technique was done for the analysis of data from experimental tests. For both welding process was not detected in the welded joints the presence of discontinuities, pores and depressions on the weld fillet surface. The results indicate that the conditions used for both welding process were satisfactory and allowed the welding of maraging 350 steel meeting necessary requirements.

Les aciers maraging classiques doivent leurs propriétés mécaniques à une composition chimique contrôlée et à des traitements thermiques adaptés, conduisant à des microstructures de martensite revenue et de précipitation de phases durcissantes (carbures et intermétalliques). Les performances de ce type d’aciers, en constante amélioration, ont donné naissance, au cours de la dernière décade, à une nouvelle nuance, le ML340TM, répondant à des applications spécifiques dans le domaine de l’aéronautique. Bien que la composition chimique soit strictement contrôlée en imposant, entre autres, une très faible teneur d’azote, des nitrures d’aluminium (AlN), de quelques dizaines de microns, peuvent précipiter. La précipitation de ces nitrures peut être à l’origine de la formation de microfissures, dommageables aux propriétés de fatigue. L’amélioration de ces propriétés de fatigue passe incontestablement par une réduction drastique de la taille de ces nitrures. Au cours de cette étude, il est apparu que les paramètres thermiques et thermomécaniques pouvaient avoir une influence sur les grandeurs microstructurales des nitrures d’aluminium : fraction massique, densité surfacique, distributions en taille et spatiale. Cette tâche a été possible grâce à la mise en place d’une méthode automatisée couplant l’analyse d’images à celle de la composition chimique. Cette méthode originale permet ainsi de discriminer, par la taille et par la chimie, les nitrures d’aluminium des autres particules (inclusion, carbures, etc.). Le rôle de certains paramètres du traitement thermique (vitesse de refroidissement, temps et température de maintien isotherme, trempe étagée, trempe intermédiaire) sur les grandeurs microstructurales des nitrures d’aluminium a été clairement identifié. Par ailleurs, l’effet d’une déformation plastique à chaud, dans le domaine austénitique, sur les grandeurs microstructurales des nitrures d’aluminium précipités, a aussi été mis en exergue. In fine, nous avons, dans cette étude, mis en évidence que l’obtention d’une précipitation submicronique de nitrures d’aluminium passe par une conjugaison maîtrisée des différents paramètres des traitements thermiques et thermomécaniques / The mechanical properties of the conventional maraging steels are controlled by the choice of chemical composition and appropriate heat treatment parameters; the latter leading to martensitic microstructure and precipitation hardening phases (carbides and intermetallics). In the last decade, this steel family, that mechanical properties are in steady progress, has enabled the development of a new grade of steel, namely: the ML340TM. The performance of the ML340TM is scheduled to meet applications in the aeronautic domain. Despite a strictly controlled chemical composition, requiring very low nitrogen content, aluminium nitride (AlN) can precipitate with particle size up to few tens of microns. The precipitation of these nitrides could be at the origin of micro-cracks formation, which is responsible of the fatigue properties degradation. Improvement of the fatigue property is undoubtedly related to a drastic reduction of the nitrides size. During this study, it was found that the parameters of thermal and thermo-mechanical treatments might have an influence on microstructural features of aluminium nitrides: mass fraction, surface density, size and spatial distribution. This task was made possible thanks to the introduction of an automated method coupling the image analysis to the chemical composition. This unusual method allows discriminating, by size and by chemistry, aluminium nitrides from the other particles (carbides inclusion, etc.). The role of some of the heat treatment parameters (cooling rate, time and isothermal holding temperature, intermediate and direct quenching) on the microstructural features of aluminium nitrides has been clearly identified. Furthermore, hot plastic deformation, in the austenitic range, has a highlighted effect on the microstructure features of the aluminium nitrides. Ultimately, in this study, we have revealed that getting a submicron aluminium nitride precipitation is subjected to a controlled combination of thermal and thermo-mechanical parameters

Diploma theses is focused on welding experiment of maraging steel by use Yb-YAG laser. Experimet is based on testing of combination steel 11321 and maraging steel. Domex420MC, Domex720MC a QSE380. In theoretical part there are described laser technology of welding, weld defect, maraging steel and inspection of welded joints. In experimental part there are porposed test and made mechanical test of weld as transverse tensile test, bend tests, Erichsen cupping test, Vickers hardness test and makroscopic and microscopic examination of welds. In conclusion there are analysis of the experiment results.

No description available.

Additive manufacturing methods for steel are competing against commercial production in an increasing pace. The geometry freedom together with the high strength and toughness due to extreme cooling rates make this method viable to use for high-performance components. The desirable material properties originate from the ultrafine grain structures. The production is often followed by a post hardening heat treatment to induce precipitation of other phases. The printing process does however bring several challenges such as cracking, pore formation, inclusions, residual stresses and distortions. It is therefore important to be able to predict the properties such as temperature evolution and residual stresses of the resulting part in order to avoid time consuming trial-and-error and unnecessary material waste. In order to link different parts and length scales of the process, the integrated computational materials engineering framework can be used where linkage tools couples results of different length scales. 18Ni300 maraging steel is a material that has been used extensively to produce parts by additive manufacturing, but there is still a wide scope for optimising the process and properties. In this thesis, the integrated computational materials engineering inspired framework is applied to link the process to the microstructure, which dictates the properties. Temperature evolution strongly influences the material properties, residual stresses and distortion in additive manufacturing. Therefore, simulations of temperature evolution for a selective laser melted 18Ni300 maraging steel have been performed by Simufact Additive and linked with the microstructure prediction tools in Thermo-Calc and DICTRA. Various printing parameters have been examined and resulting temperatures, cooling rates, segregations and martensitic start temperatures compared for different locations of the build part. Additionally, residual stresses and distortions were investigated in Simufact. It was found that higher laser energy density caused increased temperatures and cooling rates which generally created larger segregations of alloying elements and lower martensitic start temperatures at the intercellular region. There is however an impact from cooling rate and temperature independent of the energy density which makes energy density not an individual defining parameter for the segregations. By decreasing the baseplate temperature, lower temperatures below the martensitic start temperature were reached, enhancing martensite transformation. Primary dendrite arm spacing calculations were used to validate the cooling rates. The cell size corresponded well to literature of &lt;1 μm. Distortions and residual stresses were very small. The calibration was based according to literature and need experimental values to be validated. The integrated framework demonstrated in this thesis provides an insight into the expected properties of the additively manufactured part which can decrease and replace trial-and-error methods. / dditiva tillverkningsmetoder för stål tävlar mot kommersiell produktion i en ökande takt. Geometrifriheten tillsammans med hög styrka och slagseghet på grund av extrema kylhastigheter gör den här metoden intressant att använda för högpresterande komponenter. De önskvärda materialegenskaperna härstammar från den ultrafina mikrostrukturen. Processen följs ofta av en värmebehandlande härdning för att inducera utskiljningar av andra faser. Printing processen innebär dock flertalet utmaningar som exempelvis sprickbildning, porer, inneslutningar, restspänningar och förvrängningar. Det är därför intressant och viktigt att förutspå egenskaper såsom temperaturutveckling och restspänningar av den slutgiltiga komponenten för att minska tidskrävande ”trial-and-error” och onödigt materialsvin. För att länka ihop olika delar och längdskalor av processen kan ”the integrated computational materials engineering” strukturen användas där länkverktyg kopplar ihop resultat av olika längdskalor. 18Ni300 maraging stål är ett material som har använts till additivt tillverkade produkter i hög utsträckning men det finns fortfarande mycket utrymme för optimering av processen och egenskaperna. I den här avhandlingen, den ”integrated computational materials engineering” inspirerade tillvägagångssättet används för att länka processen med mikrostrukturen, vilken bestämmer egenskaperna. Temperaturutveckling påverkar kraftigt materialegenskaper, restspänningar och deformation vid additiv tillverkning. Förutsägelse av temperatur för ett selektivt lasersmält 18Ni300 stål har därför genomförts i Simufact Additive och länkats med mikrostruktursförutsägande redskapen Thermo-Calc och DICTRA. Olika maskinparametrar har undersökts och efterföljande temperaturer, kylhastigheter, segregeringar och martensitiska starttemperaturer jämförts för olika delar av geometrin. Tilläggningsvis var även restspänningar och deformationer undersökta i Simufact. Det konstaterades att högre energidensitet för lasern orsakade högre temperaturer och kylhastighet vilket generellt skapade mer segregeringar av legeringsämnen och lägre martensitisk starttemperatur i de intercellulära områdena. Det är däremot en gemensam påverkan av kylhastighet och temperatur vilket gör att energidensitet inte är den enskilda bestämmande parametern över segregeringarna. Genom att sänka temperaturen på basplattan uppnåddes lägre temperaturer under den martensitiska starttemperaturen vilket förenklar den martensistiska omvandlingen. Beräkningar av primär dendritisk armlängd användes för att validera kylhastigheterna. Cellstorleken överensstämde bra med litteraturen på &lt;1 μm. Deformationer och restspänningar var väldigt små. Kalibreringarna baserades på litteraturvärden och kräver experimentella värden för att valideras. Den integrerade strukturen  som demonstreras i den här avhandlingen förser en insikt i de förväntade egenskaperna av en additivt tillverkad del vilket kan minska och ersätta ”trial-and-error” metoder.