An Investigation on the Microstructure and Hardness of Martensitic Stainless Steel in Repair Welding Method

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Tehrani, Morteza | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44634 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Kokabi, Amir Hossein; Madah Hoseini, Hamid Reza
Abstract:
Repair welding is one of the important maintenance processes that include build-up welding and surfacing.In this study, investigation of repair welding parameters has been conducted to achieve desired microstructure with the appropriate toughness and minimum residual stress.In this research, local post-weld heat treatment has been performed by Tungsten electrode arc on weld zone. Performing this process with optimum parameters leads to the best heat cycle with the tempered Martensite microstructure. Residual stress of the sample will be reduced. HAZ coarse grains will be refined to finer grains which result in to improved toughness and reduced hardness to the acceptable limit.
Results demonstrate that local post-weld heat treatment does not have a significant change in reducing hardness but affects impact energy
Keywords:
Impact Energy ; Martensite ; Toughness ; Repair Welding ; Tempering

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