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Effect of N+Cr alloying on the microstructures and tensile properties of Hadfield steel

机译：N + Cr合金化对哈德菲尔德钢的组织和拉伸性能的影响

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摘要

The microstructures and tensile behaviors of traditional Hadfield steel, named Mn12 steel, and Hadfield steel alloyed with N+Cr, named Mn12CrN steel were studied through optical microscopy, transmission electron microscopy, and scanning electron microscopy, among others. Three different tensile strain rates of 5×10~(-4), 5×10~(-3), and 5×10~(-2)s~(-1) were selected in the tensile test. The deformation microstructures and fracture morphologies of the two steels after fracture in the tensile test were observed to analyze the tensile deformation response to different tensile strain rates. Results showed that the grain size of Mn12CrN steel was evidently refined after alloying with N+Cr. The grain would not become abnormally coarse even with increasing austenitizing temperature. During tensile deformation, the strength and plasticity of Mn12CrN steel were superior to those of Mn12 steel at the same strain rate. With increasing the strain rate, the changes in strength and plasticity of Mn12CrN steel were less sensitive to tensile strain rate compared with Mn12 steel. The effects of grain refinement and N+Cr alloying on dynamic strain aging and deformation twining behaviors were responsible for this lack of sensitivity to strain rate.
机译：通过光学显微镜，透射电子显微镜和扫描电子显微镜等研究了传统的哈德菲尔德钢（Mn12钢）和与N + Cr合金化的哈德菲尔德钢（Mn12CrN钢）的组织和拉伸性能。在拉伸试验中，选择了三种不同的拉伸应变率：5×10〜（-4），5×10〜（-3）和5×10〜（-2）s〜（-1）。观察了两种钢在拉伸试验中断裂后的变形组织和断裂形态，以分析不同拉伸速率下的拉伸变形响应。结果表明，与N + Cr合金化后，Mn12CrN钢的晶粒尺寸明显细化。即使增加奥氏体温度，晶粒也不会变得异常粗大。在相同的应变速率下，拉伸变形过程中，Mn12CrN钢的强度和塑性优于Mn12CrN。随着应变率的增加，与Mn12钢相比，Mn12CrN钢的强度和塑性变化对拉伸应变率的敏感性降低。晶粒细化和N + Cr合金化对动态应变时效和变形孪生行为的影响是这种对应变速率敏感性缺乏的原因。

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  • 来源
    《Materials Science and Engineering》 |2017年第2期|95-103|共9页
  • 作者

    C. Chen; F.C. Zhang; F. Wang; H. Liu; B.D. Yu;

  • 作者单位

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    China Railway Shanhaiguan Bridge Group Co. LTD, Qinhuangdao 066205, China;

    China Railway Shanhaiguan Bridge Group Co. LTD, Qinhuangdao 066205, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hadfield steel; N+Cr alloying; Strain rate; Microstructures; Tensile properties;

    机译：哈德菲尔德钢铁公司;N + Cr合金化;应变率;微观结构;拉伸性能;

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