热轧超高强度复相钢的氢脆敏感性  

Hydrogen embrittlement susceptibility of a hot-rolled ultra-highstrength complex phase steel

作　　者：王海波[1] 徐震霖 胡学文[1] 彭欢[1] Wang Haibo;Xu Zhenlin;Hu Xuewen;Peng Huan(Technical Center,Ma'anshan Iron&Steel Co.,Ltd.,Ma'anshan Anhui 243002,China;School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan Anhui 243032,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243002 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243032

出　　处：《金属热处理》2021年第8期51-56,共6页Heat Treatment of Metals

基　　金：安徽省科技重大专项(18030901075)。

摘　　要：通过电化学充氢和升温脱氢分析(TDS)试验,研究了热轧超高强度复相钢M950的氢逸出行为和氢陷阱类型。利用慢应变速率拉伸(SSRT)试验,研究了M950钢的氢脆敏感性,并采用场发射扫描电镜(FESEM)分析了拉伸断口的微观形貌。结果表明,试验钢的氢陷阱激活能为15.0 kJ/mol,该钢的主要氢陷阱为晶界。随着电化学充氢时间的延长,试验钢氢含量逐渐增加,塑性明显下降,但抗拉强度下降幅度较小;拉伸断口形貌由微孔聚集型韧性断裂向准解理、沿晶脆性断裂过渡。Hydrogen escape behaviour and hydrogen trap of the hot-rolled ultra-high strength complex phase steel M950 were studied by means of electrochemical hydrogen charging experiment and thermal desorption spectroscopy(TDS).The hydrogen embrittlement susceptibility of the tested steel was analysed by means of slow strain rate tensile(SSRT)test.And the fracture morphology was observed using field emission scanning electron microscope(FESEM).The results show that hydrogen trap activation energy of the tested steel is 15.0 kJ/mol.The main hydrogen trap of the steel is grain boundary.With the prolongation of electrochemical hydrogenation time,the hydrogen content of the tested steel increases gradually,and the plasticity decreases significantly,but the decline of tensile strength is not obvious.The tensile fracture morphology changes from pore-concentrating ductile fracture to quasi-cleavage and intergranular brittle fracture.

关 键 词：超高强度复相钢 氢脆敏感性 升温脱氢分析 氢陷阱 慢应变速率拉伸试验 

分 类 号：TG142.1[一般工业技术—材料科学与工程]