1059 SNCM439の内部起点型疲労特性に及ぼす焼もどし温度の影響(J12-5 金属材料の疲労特性と破壊機構(5) 低サイクル疲労/超高サイクル疲労,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Uniaxial tension-compression fatigue tests of Ni-Cr-Mo steel "SNCM439" tempered at different temperatures were conducted in air environment. Effects of tempering temperature on fatigue properties were investigated. As a result, the following conclusions were obtained; (1) Fatigue limit of surface fracture was proportional to Vickers hardness, and the relation was in good agreement with the expression σ≈ 1.6HV. (2) In very high cycle region, the fatigue strength of the material tempered at 433K was lower than that tempered at 573K. In other words, the harder material showed lower fatigue strength. (3)The kinds of inclusions, which can be interior fracture origins, probably change between different tempering temperature.
社団法人日本機械学会の論文
2008-08-02