2130 SUS304鋼中の貫通疲労き裂近傍のマルテンサイト変態率とひずみとの関係(S12-1 機能材料,S12 先端材料システムの強度・機能評価とメゾメカニックス)

概要

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This study investigates the relations between distributions of strain and those of martensitic volume fraction V_<α'> around fatigue cracks in SUS304 stainless steel. The specimens having random patterns created by paint spray on their surfaces were fatigued at room temperature (297K) in air. Photographs of random patterns around fatigue cracks were taken during fatigue tests. Distributions of strain were determined by the DIC method with these photos. Distributions of martensitic volume fraction V_<α'> were measured around fatigue cracks with ferrite scope. The higher the strain becomes, the more the α' phase was induced by plasticity-induced transformation around fatigue cracks. The distributions of strain looked similar to those of V_<α'> around fatigue cracks. It was revealed that there value of V_<α'> indicated high values in the areas where strain was high around fatigue cracks.
社団法人日本機械学会の論文
2007-09-07