J. Phys. IV France
Volume 120, December 2004
Page(s) 635 - 648

J. Phys. IV France 120 (2004) 635-648

DOI: 10.1051/jp4:2004120073

Thermal stress history in high-tensile strength steels during weld process

M. Mochizuki and M. Toyoda

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

Thermal and residual stresses in High-Tensile Strength Steels during weld process are numerically simulated considering phase transformation effect. 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 experiment. 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 analysis. Thermal stress history obtained by the simulation agrees well with the experimental result during welding heat cycles. Some applications to repair welds and fillet-weld joints of the analytical method are then introduced.

© EDP Sciences 2004