Effects of fine particle peening on torsional fatigue strength of a trip-aided bainitic ferrite steel

被引：0

作者：

Mizuno, Yuta ^{[1
]}

Hojo, Tomohiko ^{[2
]}

Sugimoto, Koh-Ichi ^{[3
]}

机构：

[1] Graduate School, Shinshu University, Wakasato, Nagano

[2] Department of Mechanical Engineering, Iwate University, Ueda, Morioka

[3] Department of Mechanical Systems Engineering, Shinshu University, Wakasato, Nagano

来源：

Zairyo/Journal of the Society of Materials Science, Japan | 2015年 / 64卷 / 11期

基金：

日本学术振兴会;

关键词：

Fine particle peening; Hardness; Residual stress; Retained austenite; Strain-induced transformation; Torsion fatigue strength; TRIP-aided bainitic ferrite steel;

D O I：

10.2472/jsms.64.853

中图分类号：

学科分类号：

摘要：

The effects of fine particle peening (FPP) on the torsional fatigue properties were investigated in the case of a transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steel that has potential for use in precision gears. FPP resulted in a significant increase in the torsional fatigue limit of the TBF steel, compared with that of a quenched and tempered SNCM420 steel. An increase in the torsional fatigue limit was larger than that in the rotating bending fatigue limit. In addition, the crack growth rate and the threshold stress intensity range of this steel were lower and higher, respectively, than those of its SNCM420 counterpart. These differences resulted from the TBF steel having a higher (1) Vickers hardness, (2) compressive residual stress, and (3) volume fraction of untransformed retained austenite in the surface hardened layer, which suppressed crack initiation and extension. © 2015 The Society of Materials Science, Japan.

引用

页码：853 / 858

页数：5

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