超高真空中における21/4Cr-1Mo鋼のクリープ・疲労相互作用

概要

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Creep-fatigue tests were conducted with 2 1/4 Cr-1 Mo steel at 550℃ in air and a vacuum of 0.1 and 100 μPa for separating the environmental effect from the pure creep-fatigue behavior. In a vacuum where no environmental effect was detected, creep-fatigue life reduced when tension going time exceeded compression going time, or when a positive mean stress developed. A good correlation exists between a creep-fatigue life and a fracture mode. When the fracture mode was predominantly transgranular, no life reduction occurred. On the contrary, when it was predominantly intergranular, a significant life reduction was observed. Environmental effect was also examined qualititatively. The extent to which the environment affects depends strongly on the wave form. The above observations are compared to those obtained with 304 steel in the authors previous study.
社団法人日本機械学会の論文
1987-12-25