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2000•The proceedings of the JSME annual meetingOpen access

Giga-cycle Fatigue Properties of High Strength Steels : Part 6 : Nanoscopic Analysis of Tempered-Martensitic Steels

Hisashi Hirukawa, Saburo MATSUOKA

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Abstract

Microstructural examination for seven tempered martensitic steels by an optical and atomic force microscopes show that prior-austenitic grain size and block width were about 18 and 0.7μm, respectively. An Ultra-micro and Vickers hardness tests show that there are three empirical equations of HV=2Hv*, σ_w=1.68HV and σ_w=3.36Hv*, where HV and Hv* are macro-and nano-hardness and σ_w is fatigue limit. It is apparent from these results that σ_w=3.36Hv* is the fundamental equation for the analysis of high-cycle fatigue mechanisms.

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Microstructural examination for seven tempered martensitic steels by an optical and atomic force microscopes show that prior-austenitic grain size and block width were about 18 and 0.7μm, respectively. An Ultra-micro and Vickers hardness tests show that there are three empirical equations of HV=2Hv*, σ_w=1.68HV and σ_w=3.36Hv*, where HV and Hv* are macro-and nano-hardness and σ_w is fatigue limit. It is apparent from these results that σ_w=3.36Hv* is the fundamental equation for the analysis of high-cycle fatigue mechanisms.

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Available abstract

Microstructural examination for seven tempered martensitic steels by an optical and atomic force microscopes show that prior-austenitic grain size and block width were about 18 and 0.7μm, respectively. An Ultra-micro and Vickers hardness tests show that there are three empirical equations of HV=2Hv*, σ_w=1.68HV and σ_w=3.36Hv*, where HV and Hv* are macro-and nano-hardness and σ_w is fatigue limit. It is apparent from these results that σ_w=3.36Hv* is the fundamental equation for the analysis of high-cycle fatigue mechanisms.

Key concepts: Materials science, Austenite, Vickers hardness test, Martensite, Fatigue limit, Metallurgy, Nanoscopic scale, Grain size

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