Influence of sulfur on high cycle fatigue property of 300M ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2023.02.009

Abstract

Abstract: Microstructure and mechanical properties of 300M steels with high sulfur and low sulfur contents were systematically studied, and the influencing mechanisms of sulfur content on inclusion characters and high cycle fatigue life of the 300M steel were emphatically analyzed. The results indicate that high sulfur addition will dramatically decrease the high cycle fatigue life of 300M steel. Higher sulfur addition will increase the precipitating temperature and precipitating content of MnS inclusion, then the probability of large size MnS inclusions appearing in the subsurface of the specimen is increased, and the difficulty of high cycle fatigue crack initiation is greatly reduced, thus reducing the high cycle fatigue life of 300M steel.

Key words: 300M steel, sulfur, MnS inclusion, high cycle fatigue life, fatigue crack initiation

CLC Number:

TG142.7

Wang Fei, Zhao Xin. Influence of sulfur on high cycle fatigue property of 300M ultra-high strength steel[J]. Heat Treatment of Metals, 2023, 48(2): 56-61.

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