轴承钢超高周疲劳研究进展

Research Progress of Bearing Steel Ultra-high Cycle Fatigue

针对轴承钢的高速、长寿化和高可靠性服役要求,介绍了国内外学者在轴承钢超高周疲劳性能方面的研究进展。文中指出,随着脱氧水平的提高,轴承钢中氧化物类夹杂数量减少,尺寸减小,对钢的疲劳性能危害减弱,Ti N成为首要危害。加入稀土可有效改善夹杂物尺寸、形状,减小对轴承钢疲劳性能的危害。通过热力学可计算出稀土Y最优添加量,为后续研究稀土轴承钢参考。文中阐述了稀土在轴承钢中的作用机理,对轴承钢超高周疲劳发展史、S-N曲线特性、细颗粒区(FGA)形成原因与裂纹扩展机理、稀土轴承钢表面处理进行概括,最后对轴承钢未来研究方向进行了展望。

In order to meet the service requirements of high speed,long life and high reliability of bearing steel,the research progress of scholars at home and abroad on the ultra-high cycle fatigue performance of bearing steel is introduced.It is pointed out in the paper that with the increase of deoxidation level,the number and size of oxide inclusions in bearing steel are reduced,and the harm to the fatigue property of steel is weakened,and TiN becomes the primary harm.The addition of rare earths can effectively improve the size and shape of inclusions and reduce the harm to the fatigue performance of bearing steel.The optimal addition amount of rare earth Y can be calculated by thermodynamics,which can be used as a reference for subsequent research on rare earth bearing steel.This paper describes the action mechanism of rare earth in bearing steel,summarizes the history of ultra-high cycle fatigue of bearing steel,the characteristics of S-N curve,the formation reasons of fine particle zone(FGA)and the mechanism of crack growth,the surface treatment of rare earth bearing steel.Finally,the future research direction of bearing steel is prospected.