机械工程学报 >

2016 , Vol. 52 >Issue 8: 125 - 132

DOI: https://doi.org/10.3901/JME.2016.08.125

材料科学与工程

衬板用铸态Fe-24Mn-7Al-1C耐磨钢的应变硬化行为研究

  • 彭世广 ,
  • 宋仁伯 ,
  • 谭志东 ,
  • 王忠红 ,
  • 郭客 ,
  • 高景俊
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  • 1. 北京科技大学材料科学与工程学院 北京 100083;
    2. 鞍钢集团矿业设计研究院 鞍山 114004;
    3. 辽宁科技大学化学工程学院 鞍山 117022;
    4. 鞍钢集团矿业公司 鞍山 114031
彭世广,男,1987年出生,博士研究生。主要从事金属材料组织和性能控制的研究。E-mail：peng_shiguang@126.com;宋仁伯(通信作者),男,1970年出生,教授,博士研究生导师。主要从事金属材料组织和性能控制的研究。E-mail：songrb@mater.ustb.edu.cn

网络出版日期: 2016-04-15

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Research on Strain Hardening Behavior of Light-weight Fe-24Mn-7Al-1C Cast Wear Resistant Steel for Lining Plates

  • PENG Shiguang ,
  • SONG Renbo ,
  • TAN Zhidong ,
  • WANG Zhonghong ,
  • GUO Ke ,
  • GAO Jingjun
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  • 1. School of materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083;
    2. Angang Group Mining Design &Research Institute, Anshan 114004;
    3. School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 117022;
    4. Anshan Iron and Steel Group Mining Company, Anshan 114031)

Online published: 2016-04-15

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摘要

对衬板用新型铸态轻质Fe-24Mn-7Al-1C耐磨钢进行准静态条件下不同变形量的压缩试验,分析应变硬化行为,揭示出该铸态耐磨钢的加工硬化机理。根据压缩应力-应变曲线和对数真应力-对数真应变曲线分析压缩变形特征;并利用光学显微镜、X射线衍射和透射电镜研究不同应变量的变形后的微观组织形貌。研究结果表明,试验钢在屈服阶段的加工硬化曲表现出双加工硬化指数行为;在透射电子显微镜和X射线衍射分析时既未发现形变诱发马氏体存在,也没有发现位错胞和形变孪晶,变形后仍为奥氏体单相组织;在不同变形量变形后的奥氏体显微组织中依次可以观察到位错堆积(1%)、高密度位错墙(5%)、泰勒晶格(10%)、具有高密度位错的畴界(20%)和微带(50%),说明轻质Fe-24Mn-7Al-C耐磨钢钢微观变形机理是平面滑移机制。

关键词： 衬板; 轻质; Fe-24Mn-7Al-C钢; 耐磨钢; 微带; 微观变形机理

本文引用格式

彭世广 , 宋仁伯 , 谭志东 , 王忠红 , 郭客 , 高景俊 . 衬板用铸态Fe-24Mn-7Al-1C耐磨钢的应变硬化行为研究[J]. 机械工程学报, 2016 , 52(8) : 125 -132 . DOI: 10.3901/JME.2016.08.125

Abstract

The novel of light-weight Fe-24Mn-7Al-1C cast wear-resistant steel for lining plates is compressed at the condition of quasi static and different deformation, strain hardening behavior during plastic deformation is analyzed, meanwhile, the work hardening mechanism of cast wear resistant steel is revealed. Based on the stress-strain curve and corresponding logarithmic true stress-logarithmic strain curve, the characteristic of compression deformation is researched. The microstructure of the novel steel before and after different deformation are further analyzed with the help of optical microscope (OM), X-ray diffraction (XRD) and transmission electron microscopy(TEM). The research results indicate that yield stage of strain hardening curve shows double work hardening index behavior. The transmission TEM and XRD analysis of deformation neither ε martensite nor mechanical twins are found, no cell formation is observed either,phase but austenite is found in the X ray diffraction analysis. In different deformation austenite after deformation in place, in turn, substructural developments are manifested by the dislocation pile ups(1% pre-strain), high density dislocation walls(5% pre-strain), Taylor lattice(10% pre-strain), Domain boundaries(20% pre-strain) and microbands(50% pre-strain) with high density of dislocations. So that the light-weight Fe-24Mn-7Al-C wear-resistant steel microscopic deformation mechanism is planar slip.

Key words： lining plates; light-weight; Fe-24Mn-7Al-1C steel; wear resistant steel; microbands; microscopic deformation mechanism

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