应力和夹杂对车轮钢中氢鼓泡的影响

金属学报, 2006, 42(8): 815-819. doi: 10.3321/j.issn:0412-1961.2006.08.007

应力和夹杂对车轮钢中氢鼓泡的影响

武明 ^1, , 褚武扬 ^2, , 李金许 ^3, , 江波 ^4, , 陈刚 ^5, , 崔银会 ^6,

1.北京科技大学材料物理系,北京,100083

2.北京科技大学材料物理系,北京,100083

3.北京科技大学材料物理系,北京,100083

4.马鞍山钢铁公司技术中心,马鞍山,432000

5.马鞍山钢铁公司技术中心,马鞍山,432000

6.马鞍山钢铁公司技术中心,马鞍山,432000

基金项目: 中国科学院资助项目(50471096)

关键词：氢鼓泡 , 应力 , 夹杂 , 车轮钢 , 白点

EFFECTS OF STRESS AND INCLUSION ON HYDROGEN BLISTERING IN WHEEL STEEL

车轮钢在恒应力下充氢表面出现氢鼓泡的临界电流和无应力试样相同,恒应力下临界可扩散氢浓度Cσ*落在无应力试样的分散带内,t检验表明应力对C0*没有影响.恒应力下发生氢致滞后断裂的门槛电流密度和门槛可扩散氢浓度分别为ith=3 mA/cm2和Cth=0.52×10-6,远小于出现氢鼓泡的相应值ic=5 mA/cm2和C0*=1.18×10-6.无应力时,氢鼓泡并不择优沿夹杂产生;但在恒应力下,氢鼓泡择优沿长条状夹杂形核,其临界可扩散氢浓度从1.18×10-6降为0.56×10-6.

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应力和夹杂对车轮钢中氢鼓泡的影响

EFFECTS OF STRESS AND INCLUSION ON HYDROGEN BLISTERING IN WHEEL STEEL

参考文献