形貌优化提高富TRIP效应中锰钢的抗氢脆性能  

Enhancing hydrogen embrittlement resistance of TRIP-rich medium Mn steel by morphology optimization

作　　者：刘宇轩 曹祚恒 黄成鹏 胡晨 黄明欣 Yuxuan Liu;Zuoheng Cao;Chengpeng Huang;Chen Hu;Mingxin Huang(Department of Mechanical Engineering,The University of Hong Kong,Hong Kong 999077,China;Shenzhen Institute of Research and Innovation,The University of Hong Kong,Shenzhen 518000,China)

机构地区：[1]Department of Mechanical Engineering,The University of Hong Kong,Hong Kong 999077,China [2]Shenzhen Institute of Research and Innovation,The University of Hong Kong,Shenzhen 518000,China

出　　处：《Science China Materials》2023年第11期4258-4266,共9页中国科学（材料科学（英文版）

基　　金：the support from the National Natural Science Foundation of China(52130102);the National Key Research and Development Program of China(2019YFA0209900);the Research Grants Council of Hong Kong(R7066-18);the Innovation and Technology Fund(MHP/064/20)。

摘　　要：相变诱发塑性(TRIP)效应通常可显著提高中锰钢的加工硬化能力,从而获得出色的强度和塑性组合.然而,变形过程中生成的新鲜马氏体极易发生氢脆,是新型高强中锰钢开发的瓶颈问题.我们在此提出了一种长带状形貌来减轻新鲜马氏体引起的氢脆.温轧制备的长带状中锰钢相比传统临界退火制备的等轴晶形貌中锰钢,不仅具有同等的高加工硬化率,而且抗氢脆性能更好.等轴晶形貌中锰钢由于缺乏有效的阻碍机制,氢裂纹一旦出现便能快速扩展.相反,对于长带状形貌中锰钢,氢裂纹会被晶界和相界所阻碍或偏转.本形貌设计可以提高其他富TRIP效应的钢和合金的抗氢脆性能.The transformation-induced plasticity(TRIP)effect in medium Mn steel generally provides a considerable enhancement to its work hardening capability and therefore an excellent combination of strength and ductility.However,the resultant fresh martensite formed during deformation is highly susceptible to hydrogen embrittlement(HE).Here,we propose an elongated,banded morphology(EBM)to mitigate HE caused by fresh martensite.EBM produced by warm rolling possesses a comparably high work hardening rate,but a better resistance to HE than the equiaxed grain morphology(EGM)produced via conventional intercritical annealing.For the EGM,hydrogen-induced crack(HIC)can propagate ra-pidly due to insignificant obstacles for crack propagation.On the contrary,for the EBM,HIC can be stopped or deflected at elongated grain or phase boundaries.The EBM morphology design may improve HE resistance in other steels and alloys with intensive TRIP effect.

关 键 词：medium Mn steel TRIP effect morphology hydro-gen embrittlement warm rolling 

分 类 号：TG142.1[一般工业技术—材料科学与工程]