低炭素ステンレス鋼溶接金属の熱時効に関する研究
概要
Fracture toughness tests and atom probe tomography were conducted to evaluate the effect of thermal aging on the fracture toughness and the microstructural evolution in ferrite phase of shielded metal arc weld (SMAW) and gas tungsten arc weld (GTAW) of type 316L stainless steels. The resistance to ductile crack extension of aged welds was lower than that of unaged welds. For the GTAW the effect of aging temperature on the reduction rate of the fracture toughness, which may be due to relatively high ferrite content of the weld, was observed. The behavior of microstructural evolution of the welds was relatively similar to that of the cast austenitic stainless steels. This result suggested that the research results on the microstructural evolution of cast austenitic stainless steels could be applied to the evaluation of austenitic stainless steel weld metals.
