OS04W0422 Thermal and residual stresses with microstructural transformation effect due to welding heat cycles

Abstract

Fundamental study for the history of thermal stress due to phase transformation and residual stress during welding heat cycles is studied in order to investigate the generating mechanism of residual stress and the effects of material properties on stress generation. Two materials of high-tensile strength steels are used in the numerical simulation and heat cycle experiment. Both-ends fixed bar specimen is received a simulated welding heat cycle in the apparatus. Material property of each microstructural phase is used and the time- and temperature-dependant proportion of microstructure are considered by using CCT-diagram in the numerical analysis. Thermal stress history obtained by the simulation agrees well with the experimental result during welding heat cycles.