SUS304の内部き裂型クリープ疲労粒界破壊 : 表面き裂型との相違(<特集>高温強度)

概要

論文の詳細を見る
Creep-fatigue tests of a Type 304 stainless steel are conducted and cracking behavior is observed. The results obtained are summarized as follows; Intergranular fracture under creep-fatigue conditions at high temperatures is classified into inner cracking type and surface cracking one. The crack initiation inside of a specimen in the former type is caused by the growth and coalescence of grain boundary diffusive cavities and the fracture is brough about by the coalescence of distributed small cracks at the final stage of life. On the other hand, the cracks at the surface in the latter type is attributed to the grain boundary sliding and the fracture is caused by the growth of surface small cracks. The inner cracks tend to appear at lower tensile strain rate, at higher compressive strain rate, and at higher temperature. A fracture mechanism map is proposed on the basis of the experimental observation.
社団法人日本材料学会の論文
1995-01-15