高压气相热充氢对SUJ2轴承钢超高周疲劳行为的影响  

The Influence of High Pressure Thermal Hydrogen Charging on Very High Cycle Fatigue Behavior of SUJ2 Bearing Steel

作　　者：李永德[1] 徐娜[1] 郭卫民[1] 吴晓峰[1] 时军波[1] 刘树伟[2] 

机构地区：[1]山东省分析测试中心山东省材料失效分析与安全评估工程技术研究中心,济南250014 [2]中国科学院金属研究所沈阳材料科学国家实验室,沈阳110016

出　　处：《材料工程》2014年第2期87-93,98,共8页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51101094);山东省科学院科技发展基金项目(2011-4)

摘　　要：研究了JIS-SUJ2轴承钢的超高周疲劳行为及高压气相热充氢对疲劳性能的影响。结果表明,高压气相热充氢后疲劳性能明显降低,裂纹源周围"GBF"区的颗粒状特征变浅甚至消失。断口上裂纹源处缺陷尺寸及分布对疲劳寿命没有影响,疲劳寿命随着"GBF"与夹杂物尺寸比的增加而增加。充氢前后裂纹源边缘的应力强度因子范围均近似正比于裂纹尺寸的1/3次方,"GBF"裂纹扩展的门槛值正比于"GBF"尺寸的1/6次方。高压气相热充氢明显提高了氢致附加应力强度因子,估算的"GBF"裂纹尺寸的极限值与实验值能够较好地吻合。The very high cycle fatigue （VHCF） behavior of JIS-SUJ2 bearing steel and the effects of high pressure thermal hydrogen charging （HPTHC） on fatigue properties were investigated. The results demonstrate that the fatigue properties of this bearing steel is obviously reduced after being precharged by HPTHC. The granular feature of “GBF” area for pre-charged specimens becomes light, sometimes even vanished. The distributions and size of the defects at the crack origins have no apparent effect on fatigue life. The fatigue life increases with increasing the relative size of “GBF” to inclusion. The stress intensity factor range at the periphery of crack origin before and after being precharged is approximately proportional to 1/3 power of the crack origin size, the crack growth threshold for “GBF” crack is proportional to 1/6 power of the “GBF” size. The additional stress intensity factor created by hydrogen multiplies up after being precharged by HPTHC, the calculated critical values of “GBF” are well in agreement with the experimental values.

关 键 词：轴承钢 超高周疲劳 夹杂物 非扩散氢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]