号数ばね論文集50号(2005年)
ページ数pp.11-15
種類論文
論文名ショットピーニングによって発生するナノ結晶層の調査と疲労強度に及ぼす影響
TitleStudy of nanocrystalline surface layer induced by shot peening and its effect on fatigue strength.
著者間野日出男1) 近藤 覚1) 近田和明2) 井村 徹2)
AuthorHideo MANO 1) Satoru KONDO 1) Kazuaki KONDA 2) Toru IMURA 2)
抄録
Abstract"The shot peening process is known to produce a hard layer called white-layer on the surface of coil springs. However, little is known about the fatigue properties of this white-layer. In this study, coil springs with white-layer were investigated. The surface of these springs was examined by micro Vickers hardness tester and FE-SEM. to evaluate fatigue strength of the springs. It was found that a microstructure of the white-layer with an average cell size of about 100 nm was observed, with a Vickers hardness rating of 1,000HV. Sample springs were manufactured in two groups utilizing a double-peening process. These springs had the same residual stress distribution and surface roughness. There is only one difference: one group had a nanocrystalline layer on the surface, while the other did not. The results of the fatigue test shows an increase of the fatigue life for the springs with nanocrystalline surface layer by approximately 10%."
著者の所属1)蠹豢神什扈蝓。押飽γ旅業大学
Belonging1)TOGO SEISAKUSYO CORP. 2)Aichi Institute of Technology
Key WordsKey Words : Shot peening, nanocrystalline, fatigue strength, surface layer