改良9Cr-1Mo鋼の超高真空中におけるクリープ疲労相互作用および有効応力の挙動

概要

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Creep-fatigue tests were conducted with Modified 9Cr-1 Mo steel at 600℃ in a very high vacuum of 0. 1 μPa in order to observe "pure" creep-fatigue behavior free from environmental effects. On the whole, time-dependent life reduction occurs when duration of tension is longer than duration of compression. A good correlation was observed between creep-fatigue life and fracture mode. When the fracture mode is transgranular, no time-dependent life reduction occurs. In contrast, when it is predominantly intergranular, a significant life reduction is observed. The overstress was experimentally analyzed to evaluate the creep-fatigue damage. The relationship between the overstress and the inelastic strain rate can be fitted with a bilinear curve independent of the strain range. At a lower strain rate, the line has a gradient ; however, there is no gradient at a higher strain rate.
一般社団法人日本機械学会の論文
1993-05-25