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Residual Stress in Welds of High Strength Steel( POSTEN60, POSTEN80)  

Chang, Kyong Ho (중앙대학교 건설환경공학과)
Lee, Chin Hyung (중앙대학교 대학원 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.16, no.5, 2004 , pp. 519-528 More about this Journal
Abstract
Most of ferrous b.c.c weld materials may experience martensitic transformation during rapid cooling after welding. And it is well known that volume expansion due to phase transformation could influence in the case of welding of high tensile strength steels on the relaxation of welding residual stress. To apply this effect practically, it is a prerequisite to establish a numerical model which is able to estimate the effect of phase transformation on residual stress relaxation quantitatively. In this study, we investigated the effect of phase transformation on the relaxation of welding residual stress through experiment. And three-dimensional thermal elastic-plastic FEM analysis is conducted to reproduce the effect of phase transformation on the relaxation of welding residual stress. Also we carried out the analysis of welding residual stress in welds of similar or dissimilar steels considering the effect of residual stress relaxation due to phase transformation.
Keywords
High Tensile Strength Steels; Martensite Transformation; Welding Residual Stress Relaxation; FEM analysis;
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