OS0724 オーステナイト系ステンレス鋼の疲労損傷によるマルテンサイト変態挙動の観察(構造用材料の疲労挙動と寿命評価,オーガナイズドセッション)

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The behavior of the defonnation-induced martensitic transformation in austenitic stainless steels was investigated under monotonic and cyclic loading. The volume fraction of martensitic phase was measured by ferrite scope in the tensile test and the axial fatigue tests. It was found that the martensitic volume fraction ζ, was not detected in early stage of fatigue process under cyclic loading below yield stress that was measured by the tensile test, and ζ increased with increasing in number of cycles. The behavior of martensitic transformation under cyclic deformation agree with the behavior of plastic strain such as cyclic softening and cyclic hardening. The process of martensite transformation can be represented as function of the cumulative plastic strain and the cumulative strain-energy density.
2009-07-24