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通过光学显微镜、X射线衍射和透射电镜等方法研究了碳含量对Fe-Ni-Mn-Si-C系合金微观组织和力学性能的影响。结果表明:Fe-Ni-Mn-Si-C系合金的主要塑性变形机制为孪生诱发塑性(TWIP)效应。碳的质量分数由0.70%增加至0.98%,合金的屈服强度和抗拉强度分别由391 MPa和860 MPa增大到458 MPa和974 MPa,伸长率由63.6%提高到69.2%。随着碳含量的提高,Fe-Ni-Mn-Si-C系合金出现明显的动态应变时效现象。Fe-15Ni-12Mn-2.5Si-XC合金具有良好的应变硬化能力,随着碳的质量分数提高至0.98%,最大应变硬化指数达到0.73。
The effects of carbon content on the microstructure and mechanical properties of Fe-Ni-Mn-Si-C alloy were investigated by optical microscope, X-ray diffraction and transmission electron microscopy. The results show that the main plastic deformation mechanism of the Fe-Ni-Mn-Si-C alloy is twins induced plasticity (TWIP). The mass fraction of carbon increased from 0.70% to 0.98%. The yield strength and tensile strength of the alloy increased from 391 MPa and 860 MPa to 458 MPa and 974 MPa, respectively, and the elongation increased from 63.6% to 69.2%. With the increase of carbon content, the obvious dynamic strain aging phenomenon appears in the Fe-Ni-Mn-Si-C alloy. Fe-15Ni-12Mn-2.5Si-XC alloy has good strain hardening ability, with the carbon mass fraction increased to 0.98%, the maximum strain hardening index reached 0.73.