张福全1, 何翠1, 周惦武2.高锰钢形变过程中加工硬化机理的研究[J].湖南大学学报:自然科学版,2016,43(12):11~16
高锰钢形变过程中加工硬化机理的研究
Study on Work Hardening Mechanism of Hadfield Steel during Deformation Process
  
DOI:
中文关键词:  高锰钢  加工硬化机理  压缩变形量  组织  性能
英文关键词:Hadfield steel  work-hardening mechanism  compression amounts  microstructure  properties
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作者单位
张福全1, 何翠1, 周惦武2 (1.湖南大学 材料科学与工程学院,湖南 长沙4100822.湖南大学 汽车车身先进设计制造国家重点实验室湖南 长沙410082) 
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中文摘要:
      采用Gleeble-3500试验机对ZGMn13Cr2高锰钢进行0. 1 s -1应变速率下的室温压缩实验,应变量分别为5%, 30%和50%.利用金相显微镜、维氏显微硬度机、XRD和TEM等方法,研究了压缩变形量对ZGMn13Cr2显微组织衍变及加工硬化机制的影响.结果表明:高锰钢压缩变形后晶粒内出现大量变形带,变形带相互交叉、缠结、割截.压缩变形量为5%时,高密度位错相互缠结呈位错胞或者位错墙,压缩变形量为30%时,基体内出现形变孪晶,随着变形量的进一步增大,孪晶的密度和体积分数增大,水韧态高锰钢在压缩变形量为50%的条件下,其显微硬度与初始态相比提高了125%,达到HV560.8.XRD结果显示,压缩变形后基体组织为奥氏体和少量的碳化物,未发现相变诱发马氏体组织.随着变形量的增大,高锰钢加工硬化机理由位错强化机制向形变孪晶强化为主、位错+少量层错强化机制为辅的机制转变.
英文摘要:
      Compression test of ZGMn13Cr2 Hadfield steel was carried out by Gleeble-3500 thermal simulator at the deformation temperature of 298 K under a constant loading strain rate of 0.1 s-1 and with the compressive deformation of 5%, 30%, and 50%, respectively. The effects of compressive deformations on the microstructure evolution and work hardening mechanism of ZGMn13Cr2 Hadfield steel were analyzed by optical microscope, vickers micro-hardness machine, transmission electron microscopy and X-ray diffraction. The test results show that a large number of deformation bands appeared in the grains of compressed high manganese steels. The deformation bands intersected, tangled and isolated with each other. A great deal of high density dislocation was entangled into dislocation cells or dislocation walls with the compression amount of 5%. Deformation twins appeared in the matrix when the compression amount was 30%. With the increasing of compressive deformation, the amount and volume fraction of the twins increased gradually. When the compression amount was 50%, the micro-hardness of water-quenched high manganese steel increased by 125% compared with the initial state, showing HV560.8. Meanwhile, XRD results show that the matrix structure remained austenite and with a bit of carbide, but no deformation-induced martensites were founded in these deformed samples. With the increasing of compressive deformation, work hardening mechanisms of Hadfield steel changed from dislocation strengthening into mainly relying on deformation twin supplemented by dislocation and stacking fault mechanisms.
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