钒微合金化对中锰热成形钢氢脆敏感性的影响  

Effect of vanadium microalloying on hydrogen embrittlement susceptibility of medium Mn based hot stamping steel

作　　者：刘浩[1,2] 王贞 张施琦[1,2] 葛锐 贾涓 刘静 Liu Hao;Wang Zhen;Zhang Shiqi;Ge Rui;Jia Juan;Liu Jing(Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan 430081,Hubei,China;Hubei Engineering Technology Research Center of Marine Materials and Service Safety,Wuhan 430081,Hubei,China;College of Materials Science and Engineering,Shenzhen University,Shenzhen 518000,Guangdong,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]湖北省海洋工程材料及服役安全工程技术研究中心,湖北武汉430081 [3]深圳大学材料学院,广东深圳518000

出　　处：《钢铁钒钛》2024年第3期169-175,共7页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(52231003,52201084)。

摘　　要：利用慢应变速率拉伸、氢渗透以及氢显试验,结合SEM、TEM、EBSD分析,研究了0.12%钒对中锰热成形钢氢脆敏感性的影响。结果表明,钒微合金化对中锰热成形钢氢脆敏感性具有双重影响:一方面,钒不仅显著细化晶粒、析出了大量的纳米级含钒碳化物,使钢中的氢陷阱密度大幅增加,有效抑制了氢向铁素体/马氏体界面的富集,而且添加钒后长条状铁素体明显减少、小角度晶界占比增加,可进一步抑制裂纹的连续扩展,从而降低试验钢的氢脆敏感性;但另一方面,钒使钢中马氏体含量增加,会在一定程度上增加氢脆发生的风险。在常规的热成型工艺下,钒微合金化产生的有益作用更为显著,使含钒试验钢具备更优异的氢脆抗力。The effect of adding 0.12%vanadium on hydrogen embrittlement susceptibility of medium Mn based hot stamping steel was studied by using slow strain rate tensile,hydrogen permeability and hydrogen microprinting experiments,combined with SEM,TEM,and EBSD analysis.The results show that vanadium microalloying on hydrogen embrittlement susceptibility has double effects.On the one hand,vanadium not only significantly refines grains and precipitates a large number of nano-scale vanadium-containing carbides in steel,which greatly increases the hydrogen trap density and effectively inhibites hydrogen enrichment to the ferrite/martensite interface.Moreover,the addition of vanadium reducing the long strip-shaped ferrite and increasing the proportion of small angle grain boundaries can further restrain the continuous crack propagation and decrease the hydrogen embrittlement susceptibility.But on the other hand,vanadium increases the martensite content,which increases the risk of hydrogen embrittlement to a certain extent.Under conventional hot forming process,the beneficial effect of vanadium microalloying is more significant,which makes the test steel containing vanadium has better hydrogen embrittlement resistance.

关 键 词：中锰热成形钢 钒微合金化 氢脆敏感性 氢扩散 

分 类 号：TF76[冶金工程—钢铁冶金] TG111.91[金属学及工艺—物理冶金]