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Report No.
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Mechanism study on IGSCC by analyzing residual stress and work hardening in welds of low-carbon austenitic stainless steel with surface machining

Mochizuki, Masahito*; Mori, Hiroaki*; Katsuyama, Jinya  

To make clear the effects of residual stress and work hardening on IGSCC behavior in the welds of the austenitic stainless steel with surface hardening, residual stress and hardness in butt-joints of pipes are evaluated by 3D thermo-elastic-plastic analysis. The grain boundary (GB) sliding behavior is examined using constant strain rate tensile test with the numerically simulated tensile residual stress due to welding and surface machining. It was made clear that GB sliding occurred at 561 K. It was also indicated that the GB sliding in cold-rolled one occurred in smaller strain conditions than that in solution treated one, and that the amount of GB sliding increased with added strain. In addition, it was clarified that the GB energy was raised by the GB sliding. It is concluded from these results that the cause of IGSCC in the welds of stainless steel with surface hardening is the increase in GB energy due to GB sliding accelerated by residual stress of welding and surface hardening.

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