オーステンパ球状黒鉛鋳鉄のショットピーニングによる疲労強度への影響

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This paper presents the results of a study on the effects of the shot-peening process on the fatigue characteristics of austempered ductile iron (ADI). Experiments mainly involve surface durability tests using cylindrical roller specimens and bending fatigue tests, as well as X-ray stress measurements. The elasto-hydrodynamic lubrication (EHL) theory was used in the determination of surface durability. It was found that the surface durability of the shot-peened ADI was slightly lower than the of the non-shot-peened ADI, and this difference was attributed to the difference in surface roughness. Moreover, it was found that residual stress does not affect the surface durability of the shot-peened ADI. Results also showed that the shot-peening of the ADI is useful for improving the bending fatigue strength. Consequently, from the viewpoint of fatigue strength of ADI, surface roughness, especially as related to the surface durability, should be strongly considered in the case of application of shot-peened ADI to machine elements subjected to bending and/or sliding abrasion.歯車材の表面改質の研究の一環．
一般社団法人日本機械学会の論文
1995-05-25