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Strukturní stabilita žárupevných ocelí a jejich svarů / Structural Stability of Creep-Resistant Steels and their WeldmetsŠohaj, Pavel January 2009 (has links)
The structural stability of creep-resistant steels P22, P91 and Eurofer´97 and structural stability of weld joint P22/P91 have been studied. The microstructural changes during annealing at temperatures of 500 – 900°C were examined. The state of equilibrium have been simulated using the ThermoCalc software. The computed results were compared with published data. A good agreement between the simulation and the published data was observed.
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Estudo morfologico e cinetico da nitretacao por plasma pulsado do aco inoxidavel martensitico AISI 420PINEDO, CARLOS E. 09 October 2014 (has links)
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06912.pdf: 10380955 bytes, checksum: 3e22ae9dda613db66c72f121ed37b278 (MD5) / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Estudo morfologico e cinetico da nitretacao por plasma pulsado do aco inoxidavel martensitico AISI 420PINEDO, CARLOS E. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:44:26Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:39Z (GMT). No. of bitstreams: 1
06912.pdf: 10380955 bytes, checksum: 3e22ae9dda613db66c72f121ed37b278 (MD5) / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Creep and Creep-fatigue Deformation Studies in 22V and P91 Creep-strength EnhancedFerritic SteelsWhitt, Harrison Collin 11 July 2019 (has links)
No description available.
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MECHANICAL PROPERTIES AND RADIATION RESPONSE OF NANOSTRUCTURED FERRITIC-MARTENSITIC STEELSZhongxia Shang (9171533) 17 November 2022 (has links)
<p>Structural metallic materials
exposed to energetic particle bombardments often experience various types of
irradiation-induced microstructural damage, thus degrading the mechanical
properties of the materials in form of irradiation hardening and embrittlement.
Nanostructured materials have shown better radiation resistance than their
coarse-grained (CG) counterparts due to the existence of abundant defect sinks,
such as grain boundaries, twin boundaries, and phase boundaries. However,
recently developed nanocrystalline (NC) steels show limited room-temperature
tensile ductility (< 1%), which may become a concern for their future
application for nuclear reactors. The focus of this thesis is to explore the
strength-ductility dilemma in modified 9Cr1Mo (T91) ferritic/martensitic (F/M)
steel processed by thermomechanical treatment (TMT) and surface severe plastic
deformation (SSPD) with an attempt to fabricate strong, ductile and radiation
resistant F/M steels. </p>
<p><b>Carbon partitioning</b>
between the quenched martensite and the other phases (bainitic ferrite or
retained austenite) is critical for enhancing the strength and ductility of T91
steel. The tensile properties of partially tempered (PT) T91 steel can be
tailored through introducing bainitic ferrite with high-density nanoscale
transition carbides and refined lath martensite. In addition, retained
austenite was introduced by increasing the carbon concentration of T91 steel to
0.6 wt.%. The carbon-modified steel processed by quenching partitioning (Q-P)
treatment exhibits an ultrahigh strength, ~ 2 GPa, with a uniform strain of ~
5% due to the existence of coherent carbides, ultrafine martensite and retained
austenite. </p>
<p>Meanwhile, surface mechanical
grinding treatment (SMGT) on T91 steel reveals that introducing <b>gradient
structures</b> on the sample surface contributes to a higher strength and an
improved plasticity than its homogeneously structured counterpart. The
deformation mechanism of the gradient structures was investigated with the
assistance of quasi <i>in situ</i> crystal orientation analyses. Furthermore, <i>ex
situ</i> He ion irradiation on the gradient T91 steel indicates that
radiation-induced damage, such as bubble-induced swelling and irradiation
hardening, were gradually mitigated by grain refinement from the sample surface
to the center, resulting in superior radiation resistance. The results obtained
from this thesis may facilitate the design and fabrication of strong, ductile
and radiation-tolerant F/M steels.</p>
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