王琨,樊朋煜,刘蓉,桂晓露,高古辉,白秉哲

• 1:北京交通大学机械与电子控制工程学院轨道交通金属材料研究所

摘要(Abstract)：

采用Thermo-calc软件,X射线衍射仪(XRD)、扫描电镜(SEM),DIL805L巴赫膨胀仪和透射电镜(TEM)等研究了贝氏体等温处理对Ⅴ微合金化贝氏体钢组织和力学性能的影响。试验钢经900℃奥氏体化后,分别在320℃和340℃等温处理4、8和24 h。结果表明,试验钢的显微组织主要由板条贝氏体铁素体组成,320～340℃等温4～24 h得到的组织为残留奥氏体(RA)和部分马氏体/奥氏体岛。320℃等温8 h后试验钢的强塑性最佳:抗拉强度1534 MPa,屈服强度991 MPa,均匀伸长率29.7%,总伸长率34.2%。贝氏体铁素体中RA的高稳定性和高位错密度使得试验钢具有优异的性能。XRD和DIL结果表明,RA中碳的富集程度越高,M/A岛的数量越少,RA的稳定性越高,变形过程中的相变诱导塑性(TRIP)效应越强。此外,TEM结果表明,钒析出的V(C, N)的析出强化和奥氏体中的层错对试验钢性能的改善有重要影响。

关键词(KeyWords)： V微合金化;贝氏体钢;等温处理;力学性能;残留奥氏体

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2017YFB0304501);; 北京市自然基金“面上”项目(2172047)

作者(Author): 王琨,樊朋煜,刘蓉,桂晓露,高古辉,白秉哲

DOI: 10.13289/j.issn.1009-6264.2019-0540

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