Effect of welding parameters on the heat-affected zone of AISI409 ferritic stainless steel
来源期刊：International Journal of Minerals Metallurgy and Materials2012年第10期
论文作者：Eslam Ranjbarnodeh Stefanie Hanke Sabine Weiss Alfons Fischer
文章页码：923 - 929
摘 要：One of the main problems during the welding of ferritic stainless steels is severe grain growth within the heat-affected zone（HAZ）.In the present study,the microstructural characteristics of tungsten inert gas（TIG） welded AISI409 ferritic stainless steel were investigated by electron backscattered diffraction（EBSD）,and the effects of welding parameters on the grain size,local misorientation,and low-angle grain boundaries were studied.A 3-D finite element model（FEM） was developed to predict the effects of welding parameters on the holding time of the HAZ above the critical temperature of grain growth.It is found that the base metal is not fully recrystallized.During the welding,complete recrystallization is followed by severe grain growth.A decrease in the number of low-angle grain boundaries is observed within the HAZ.FEM results show that the final state of residual strains is caused by competition between welding plastic strains and their release by recrystallization.Still,the decisive factor for grain growth is heat input.
Eslam Ranjbarnodeh1，Stefanie Hanke2，Sabine Weiss2，Alfons Fischer2
1. Young Researchers Club(East Tehran Branch),Islamic Azad University,Tehran 33955-163,Iran2. Materials Science and Engineering,University of Duisburg-Essen,Duisburg 47057,Germany
摘 要：One of the main problems during the welding of ferritic stainless steels is severe grain growth within the heat-affected zone（HAZ）.In the present study,the microstructural characteristics of tungsten inert gas（TIG） welded AISI409 ferritic stainless steel were investigated by electron backscattered diffraction（EBSD）,and the effects of welding parameters on the grain size,local misorientation,and low-angle grain boundaries were studied.A 3-D finite element model（FEM） was developed to predict the effects of welding parameters on the holding time of the HAZ above the critical temperature of grain growth.It is found that the base metal is not fully recrystallized.During the welding,complete recrystallization is followed by severe grain growth.A decrease in the number of low-angle grain boundaries is observed within the HAZ.FEM results show that the final state of residual strains is caused by competition between welding plastic strains and their release by recrystallization.Still,the decisive factor for grain growth is heat input.
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