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。
The microstructures of Fe-Mn-Ni-Cr steels with medium carbon andthe effect of alloy elements have been investigated by means of X-ray diffractionquantitative phase analyses, metallography and hardness tests. The volume fractionof martensite in steels quenched at 1100℃ can be expressed as f_M~(1100)= 162.643 - 15.482Mn - 7.36Ni - 4.286 (Cr + Mo + V)Based on this expression, the quasi-equilibrium microstructure diagram has beenobtained.
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