东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (2): 224-228.DOI: 10.12068/j.issn.1005-3026.2017.02.015

• 材料与冶金 • 上一篇    下一篇

Fe-8/11Mn-4Al-0.2C钢的力学性能及应变硬化行为

蔡志辉, 李志超, 才博, 丁桦   

  1. (东北大学 材料科学与工程学院, 辽宁 沈阳110819)
  • 收稿日期:2015-12-09 修回日期:2015-12-09 出版日期:2017-02-15 发布日期:2017-03-03
  • 通讯作者: 蔡志辉
  • 作者简介:蔡志辉(1985-),男,福建漳州人,东北大学博士后研究人员; 丁桦(1958-),女,安徽合肥人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金青年科学基金资助项目(51501035); 中国博士后科学基金资助项目(2015M580230,2016T90227).

Mechanical Properties and Strain Hardening Behavior of Fe-8/11Mn-4Al-0.2C Steels

CAI Zhi-hui, LI Zhi-chao, CAI Bo, DING Hua   

  1. School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2015-12-09 Revised:2015-12-09 Online:2017-02-15 Published:2017-03-03
  • Contact: CAI Zhi-hui
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摘要: 对Fe-8Mn-4Al-0.2C(8Mn)和Fe-11Mn-4Al-0.2C(11Mn)实验钢进行不同温度的淬火热处理,实现奥氏体体积分数和稳定性的最优化.通过拉伸实验可得,8Mn钢和11Mn钢在淬火温度为750℃时,获得最佳的力学性能组合,即强塑积为46.4GPa%和66.9GPa%.8Mn-750试样和11Mn-750试样在拉伸过程中表现出相同的三阶段应变硬化行为.通过XRD测定变形过程中奥氏体体积分数的变化,研究发现TRIP效应主要发生在变形的第二和第三阶段.11Mn-750试样由于具有更高的奥氏体含量、转变量和稳定性,使得其塑性远远高于8Mn-750试样.

关键词: 中锰钢, 力学性能, TRIP效应, 应变硬化行为

Abstract: In order to optimize austenite volume fraction and stability, Fe-8Mn-4Al-0.2C (8Mn)and Fe-11Mn-4Al-0.2C (11Mn)steels were quenched at different temperatures. The variation of austenite fraction during tensile testing was measured by XRD. The results showed that 8Mn steel and 11Mn steel quenched at 750℃ obtain the best tensile property combinations, i.e., the product of strength and elongation is up to 46.4GPa% and 66.9GPa%, respectively. 8Mn-750 sample and 11Mn-750 sample exhibit a similar three-stage strain hardening behavior. TRIP effect mainly occurs in stage 2 and 3. The 11Mn-750 sample, which has higher austenite fraction, transformation ratio and stability, has a much better ductility than 8Mn-750 sample.

Key words: medium Mn-content steel, mechanical property, TRIP effect, strain hardening behavior

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