239 軟窒化処理材におけるショットピーニング効果に関する研究(第 2 報)

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タイトル別名
  • Study on Shot Peening Effect on Nitrocarburized Material

抄録

The authors investigated the surface refined characteristics and fatigue strength of NH materials treated by Double Shot Peening (DSP) and Stress Double Shot Peening (SDSP). The results oblation : (1) High hardness of 383HV by DSP (2) Large maximum compressive residual stress with -733MPa of the NH+DSP material (3) Increased fatigue limit of the NH+DSP material. 33%(stress ratio R=0) and 28% (R=-1) higher fatigue limit than the NH materials, respectively. And considerably increased fatigue limit of the NH+SDSP material. 58% (stress ratio R=0) and 39% (R=-1) higher fatigue limit than the NH materials, respectively. (4) There is proportionality relation between mean stress and amplitude stress is R=0. However, there is no it in R=-1.

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