ステンレス鋼における腐食疲労き裂の発生と初期成長挙動 : 第3報, 相比率の影響

概要

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Fatigue tests in room air and in 3%NaCl solution have been conducted on a duplex stainless steel, SUS329J4L, in order to clarify the influence of volume fraction of ferrite and austenite phases on crack initiation and early crack growth. Three materials with different volume fractions were prepared with solution treatment at 1050℃, 1150℃ and 1250℃, resulting in the volume fractions of austenite phase of 50%, 28% and 12%, respectively. The crack initiation sites in three materials were predominantly within austenite phase in both environments. The fluctuation of crack growth rates was found in the microstructurally small crack region for three materials and the crack growth rates decreased at phase boundaries. This behavior was more remarkable in the material solution treated at 1050℃, because small cracks encountered frequently with phase boundaries. Early crack growth immediately after the initiation was enhanced by 3%NaCl solution.
一般社団法人日本機械学会の論文
2001-06-25