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本文利用X射线定量相分析及金相观察和硬度测试,考察了中碳Fe-Mn-Ni-Cr钢的组织及合金元素的作用。建立了经1100℃淬火后的马氏体体积分数与合金成分的定量关系式; f_M~(1100)=162.643-15.482Mn-7.36Ni-4.286(Cr+Mo+V)并在此基础上给出了亚平衡组织图。结果表明,Mn稳定奥氏体的作用大于Ni的作用。Ni和Cr当量分别以[Ni]=2.104Mn+Ni,[Cr]=Cr+Mo+V表示。计算了M_S点处的马氏体相变驱动力,指出Mn具有强烈降低相变驱动力的作用。
In this paper, X-ray quantitative phase analysis and metallographic observation and hardness testing were conducted to investigate the effect of microstructure and alloying elements on the Fe-Mn-Ni-Cr steel. The quantitative relationship between the volume fraction of martensite and alloy composition after quenching at 1100 ℃ was established. F_M ~ (1100) = 162.643-15.482Mn-7.36Ni-4.286 (Cr + Mo + V) Sub-balanced organization chart. The results show that Mn stabilizes the austenite more than Ni. The Ni and Cr equivalents are expressed as [Ni] = 2.104 Mn + Ni, [Cr] = Cr + Mo + V, respectively. The driving force of martensitic transformation at M_S point was calculated, and Mn was found to have the effect of strongly reducing the driving force of phase transformation.