(α+γ) 二相ステンレス鋼の疲労き裂成長挙動に及ぼす475℃時効の影響

概要

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The effect of ageing at 475℃ on fatigue crack growth behavior was studied using (α+γ) two-phase stainless steel with two different grain sizes, which is expected to be used widely in industrial fields. The main results obtained are as follows ; (1) In the low ΔK range, the fatigue crack growth rate (da/dN) decreased with ageing at 475℃ for the coarse grained specimens. This is caused by the enhancement of the roughness induced crack affected very much by ageing for the fine grained specimens. (2) In the low ΔK range, da/dN became to be fluctuated very much with ΔK by the ageing. This closely related to the fact that the fatigue crack growth mechanism changes from slip plane fracture to that of cleavage in every α grain with aging. (3) In the high ΔK range, da/dN increased with ageing particularly for the coarse grained specimens, since the cleavage fatigue crack growth mechanism becomes to be more dominant as ΔK increases.
社団法人日本材料学会の論文
1991-05-15