贝氏体车轮钢的氢脆敏感性  

Hydrogen Embrittlement Sensitivity of a Bainite Railway Wheel Steel

作　　者：任学冲[1,2] 金莹[1] 王莎莎[3] 宿彦京[3] 乔利杰[3] 张明如[2] 崔银会[2] 

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]马鞍山钢铁股份有限公司技术中心,马鞍山243000 [3]北京科技大学新材料技术研究院,北京100083

出　　处：《腐蚀与防护》2011年第11期863-867,共5页Corrosion & Protection

基　　金：国家自然科学基金资助项目(50901010);高等学校博士学科点专项科研基金资助项目(200800081006)

摘　　要：用电解充氢试验方法研究了可扩散氢浓度对贝氏体车轮钢慢拉伸性能及氢致滞后开裂性能的影响,并与普通珠光体-铁素体车轮钢进行了对比。结果表明,在相同慢拉伸条件下,贝氏体车轮钢材料的塑性损失高于珠光体-铁素体车轮钢;在相同的充氢条件下,贝氏体车轮钢氢致开裂门槛应力强度因子相对于断裂韧性值的降低程度明显高于珠光体-铁素体车轮钢,具有较高的氢致开裂敏感性。The influence of diffusible hydrogen concentration （Co） on the plasticity and hydrogen induced delayed cracking of a bainite railway wheel steel was investigated by means of the slow strain rate test （SSRT） specimens and wedge open loading （WOL） specimens charged in a solution respectively. The results showed that the plasticity loss of the bainite wheel steel was larger than that of the pearlite-ferrite CL60 wheel steel. The threshold stress intensity factor of hydrogen induced delayed cracking K1, of the bainitie wheel steel decreased with the increase of diffusible hydrogen concentration. The Km of the bainite wheel steel was much lower than that of the CL60 wheel steel when C0≥1.6 × 10-6, though the fracture toughness KIC of the bainite wheel steel was much higher than that of the CL60 wheel steel.

关 键 词：贝氏体 车轮钢 氢脆 氢致滞后开裂 

分 类 号：TG172.9[金属学及工艺—金属表面处理]