• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (22): 276-283.doi: 10.3901/JME.2022.22.276

• 材料科学与工程 • 上一篇    下一篇

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VC析出相对Fe-Mn-Si-Al相变诱导塑性钢微观组织演变及力学性能的影响

孙琦迪1,2, 傅聪1, 金静静1, 杨蔚涛1,2, 郝庆国1,2, 章斌3, 杨旗1,2   

  1. 1. 上海材料研究所 上海 200437;
    2. 上海市工程材料应用与评价重点实验室 上海 200437;
    3. 岛津企业管理(中国)有限公司分析中心 上海 200233
  • 收稿日期:2021-11-14 修回日期:2022-05-03 出版日期:2022-11-20 发布日期:2023-02-07
  • 通讯作者: 杨旗(通信作者),男,1974年出生,博士,正高级工程师。主要研究方向为金属抗震阻尼材料的研制。E-mail:m1866733474@163.com
  • 作者简介:孙琦迪,男,1996年出生,硕士。主要研究方向为低层错能高锰钢力学性能调控。E-mail:SunQidi03@163.com
  • 基金资助:
    上海市优秀学术/技术带头人计划资助项目(18XD1420700)

Effect of Vanadium Carbide Precipitates on Microstructure Evolution and Mechanical Properties of Fe-Mn-Si-Al TRIP Steel

SUN Qi-di1,2, FU Cong1, JIN Jing-jing1, YANG Yu-tao1,2, HAO Qing-guo1,2, ZHANG Bin3, YANG Qi1,2   

  1. 1. Shanghai Research Institute of Materials, Shanghai 200437;
    2. Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai 200437;
    3. Analytical Applications Center, Shimadzu(China) Co., Ltd., Shanghai 200233
  • Received:2021-11-14 Revised:2022-05-03 Online:2022-11-20 Published:2023-02-07

摘要: Fe-Mn-Si-Al相变诱导塑性钢因具有较低屈服强度和良好低周疲劳性能,有潜力替代现有抗震用低屈服点钢制造钢阻尼器。对试验用钢进行准静态拉伸和低周疲劳试验,并借助多种组织表征方法研究试验用钢变形前后的微观组织演变,揭示VC析出相及奥氏体晶粒尺寸对其力学性能的影响规律及作用机理。结果表明:奥氏体晶粒粗化可以促进ε马氏体生成交叉状多变体,从而在准静态拉伸过程中,提高试验用钢断后伸长率;而在低周疲劳变形过程中,交叉状多变体削弱ε马氏体相变可逆性,使其疲劳寿命降低。VC析出相有助于提高试验用钢的屈服强度和抗拉强度,但其对ε马氏体生长具有抑制作用,使断后伸长率降低。在低周疲劳变形过程中,VC析出相钉扎ε马氏体/奥氏体两相界面,抑制ε马氏体逆相变,从而使试验用钢的循环加工硬化程度显著提高,低周疲劳寿命降低。

关键词: Fe-Mn-Si-Al-C-V相变诱导塑性钢, 微观组织演变, 力学性能, ε马氏体相变, VC析出相

Abstract: Fe-Mn-Si-Al TRIP steels with low yield strengths and good low-cycle fatigue lives have the potential to be used as seismic damping steels. The quasi-static tensile test and low-cycle fatigue test are performed on an Fe-Mn-Si-Al TRIP steel. The microstructure evolution before and after deformation of the experimental steel is characterized using multiple microstructure analyses,revealing the influence and mechanism of VC precipitates and austenite grain size on mechanical properties. The austenite grain coarsening promotes the formation of crossed multi-variant ε-martensite, thereby increasing the elongation of the experimental steel during the quasi-static tension. In contrast, during the low-cycle fatigue deformation, the low-cycle fatigue life of the experimental steel is decreased since crossed multi-variants weaken the reversibility of the ε-martensitic transformation. VC precipitates improve the strength of the experimental steel but hinder the growth of ε-martensite, leading to a reduction in elongation. VC precipitates pin the interfaces between the ε-martensite and austenite and inhibit reversible ε-martensite transformation during the low-cycle fatigue deformation, resulting in significant enhancement of cyclic work hardening and a decrease in the low-cycle fatigue life of the experimental steel.

Key words: Fe-Mn-Si-Al-C-V TRIP steel, microstructure evolution, mechanical properties, ε-martensitic transformation, vanadium carbide precipitate

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