Numerical Simulation of Residual Stress and Deformation Considering Phase Transformation Effects(Mechanics, Strength & Structural Design)

概要

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The objective of this work was to investigate the effects of solid-state phase transformation on residual stresses and deformations in low carbon and medium carbon steels welded by the tungsten inert gas (TIG) arc welding process. An uncoupled thermal-mechanical three-dimensional finite element model that took into account the solid-state phase transformation was developed. In this study, different continuous cooling transformation (CCT) diagrams were used to predict the fractions of martensite for the coarse-grained HAZ and the fine-grained HAZ, respectively. Effects of volume change due to austenite-martensite transformation on residual stress and distortions were studied. The analysis of low carbon steel revealed that the residual stress and deformation did not seem to be affected by phase transformation during cooling. However, for medium carbon steel, the residual stresses and deformation were significantly affected by low temperature phase transformation.