【摘要】 采用了两种不同的充氢方法(浸泡充氢和高压气相热充氢)研究了氢对断口上颗粒状亮区(Granular Bright Facet/GBF)尺寸的影响。研究表明,浸泡充氢并没有改变"GBF"的颗粒状特征,高压气相热充氢使得"GBF"的颗粒状特征变浅甚至消失。不论哪种充氢方法,充氢均使得"GBF"在较低的外加载荷下出现,且与充氢前相比"GBF"尺寸明显增加。电化学充氢没有改变疲劳寿命与(SGBF)1/2/(Sinc)1/2之间的关系,但是高压气相热充氢后疲劳寿命与(SGBF)1/2/(Sinc)1/2之间的关系有显著变化。更多还原

【Abstract】 Influence of hydrogen on granular bright facet( GBF) size of very high cycle fatigue fracture for SUJ2 bearing steel was studied by two kinds of hydrogen charging methods( soaking charging method and high pressure thermal hydrogen charging method). The results show that the granular feature of the GBF is not changed after being pre-charged by soaking method,but is lightened and even vanished after being pre-charged by high pressure thermal hydrogen charging method. The GBF with larger size is observed under lower applied stress amplitude for the hydrogen pre-charged specimens by the two charging methods. The relationship between fatigue life and the ratio of GBF size to inclusion size is not changed for the steel after being pre-charged by electrochemical charging but obviously changed after being pre-charged by high pressure thermal hydrogen charging method.更多还原