浸炭鋼のピッチング疲労強度に及ぼす硬化層硬さの影響

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  • Influence of Case Hardness on Pitting Fatigue Strength of Carburized Steel.
  • シンタン コウ ノ ピッチング ヒロウ キョウド ニ オヨボス コウカソウ カタサ ノ エイキョウ

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In order to elucidate the influence of case hardness on pitting fatigue strength, fatigue tests were carried out with carburized SCr 420 steel rollers that tempered at various temperatures to adjust case hardness. The resuits on 0% specific sliding condition show intemal initiation pitting form and the fatigue strength increases with case hardness. The results on -25% specific sliding condition show two pitting forms ; internal initiation and surface initiation. In the case of internal initiation on -25% specific sliding condition, the fatigue strength increases with case hardness as 0% specific sliding condition. The fatigue strength of internal initiation on both specific sliding conditions coincides with the values estimated from shear strength related case hardness. In the case of surface initiation, the fatigue strength decreases with case hardness. It becomes clear that the pitting from showed on -25% specific sliding condition is lower strength form which internal initiation or surface initiation, that relationship depends on case hardness.

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