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Previous issue date: 2015-06-26 / CAPES / Este estudo analisou a influência da temperatura no tratamento de alívios de tensões, tendo como base o método de deslocamento de pontos coordenados (DPC), e a importância do sentido de soldagem no deslocamento dos pontos coordenados em uma chapa de aço naval (ASTM A-131 de grau AH-36), retangular, de dimensões 200 mm x 65 mm e 14 mm de espessura pelo processo de soldagem GMAW. Nos tratamentos térmicos foram utilizadas temperaturas de 580°C, 630°C e 680°C durante intervalos de tempo restritos e resfriados ao ar. A medição do alívio das tensões residuais foi realizada através do método alternativo de deslocamento de pontos coordenados e validada através da difração de raios-X, que por meio da variação das distâncias dos furos, provocada pelo tratamento térmico, permite medir as tensões residuais pontuais presentes nas juntas. Com a variação das temperaturas ensaiadas obteve-se um perfil de alívio de tensão residual maior utilizando temperaturas de tratamento térmicas mais elevadas. / This study aims to analyze the influence of the temperature in treatment of stress relief used in DCP method (Displacement of Coordinated Point) and the importance of welding direction in displacement of the coordinate points, using a naval steel sheet (ASTM A 131 grade AH36) with rectangular dimensions of 200 mm X 70 mm and 14 mm thick, the GMAW process was performed considering the welding direction after welding different points were previously mapped using a coordinated measurement machine. The residual stresses were carried out through this alternate method considering displacement of coordinated point produced by heat treatment in temperature of 580°C, 630°C and 680°C. Before heat treatment, the residual stresses in previously mapped points were measured by X-Ray diffraction. The results showed that the temperature of heat treatments increase the displacement of the points: higher temperature produced higher displacement and in consequence higher apparent residual stress. X-Ray diffraction showed a good agreement with DCP method in sheet heat treated at 680°C compared to the other temperatures.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufpe.br:123456789/15469 |
| Date | 26 June 2015 |
| Creators | GONÇALVES, Israel Lira |
| Contributors | FERREIRA, Ricardo Artur Sanguinetti |
| Publisher | Universidade Federal de Pernambuco, Programa de Pos Graduacao em Engenharia Mecanica, UFPE, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Breton |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFPE, instname:Universidade Federal de Pernambuco, instacron:UFPE |
| Rights | Attribution-NonCommercial-NoDerivs 3.0 Brazil, http://creativecommons.org/licenses/by-nc-nd/3.0/br/, info:eu-repo/semantics/openAccess |
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