Effect of welding parameters on the heat-affected zone of AISI409 ferritic stainless steel

• Published in: International journal of minerals, metallurgy and materials Vol. 19; no. 10; pp. 923 - 929
• Main Authors: Ranjbarnodeh, Eslam, Hanke, Stefanie, Weiss, Sabine, Fischer, Alfons
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg University of Science and Technology Beijing 01-10-2012; Springer Nature B.V; Young Researchers Club(East Tehran Branch),Islamic Azad University, Tehran 33955-163, Iran%Materials Science and Engineering, University of Duisburg-Essen, Duisburg 47057, Germany
• Subjects: Base metal; Boundaries; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Critical temperature; Electron back scatter; Ferritic stainless steel; Ferritic stainless steels; Finite element method; Gas tungsten arc welding; Glass; Grain boundaries; Grain growth; Grain size; Heat affected zone; Materials Science; Mathematical models; Metallic Materials; Misalignment; Natural Materials; Rare gases; Recrystallization; Surfaces and Interfaces; Thin Films; Three dimensional models; Tribology; Tungsten; Welding; Welding parameters; 晶粒生长; 有限元模型; 热影响区; 焊接参数; 焊接过程; 电子背散射衍射; 铁素体不锈钢; 铁素体系不锈钢; grain growth; ferritic stainless steel; welding; recrystallization; finite element method; heat affected zone
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-012-0648-5

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 microstmctural 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 sWains is caused by competition between welding plastic strains and their release by recrystallization. Still, the decisive factor for grain growth is heat input.