制备了Fe-13Mn-0.1C合金并对其进行了固溶处理, 然后在620 ℃保温0~300 h, 采用光学显微镜、X射线衍射仪分析了不同保温时间后合金的显微组织和相的差异, 并利用热膨胀相变仪测定了合金的平均线膨胀系数。结果表明: 固溶处理后合金含有γ、ε-M、α-M相; 在620 ℃保温过程中随保温时间的延长, γ相和α-M相的含量有所降低, ε-M相的含量有所增加; 固溶处理态合金的平均线膨胀系数最低, 保温150 h后的平均线膨胀系数最高, 为26.9×10-6 ℃-1。

The Fe-13Mn-0.1C alloy was prepared and solid solution treated, and then heated at 620 ℃ for 0~300 h. The difference of microstructure and phases of the alloy after heating for different times was analyzed by optical microscopy and X-ray diffraction, and the average coefficient of linear expansion (ACLE) of the alloy was measured by thermal expansion phase transition instrument. The results show that the alloy was composed of γ phase、ε-M phase and α-M phase after solid solution treatment, and the amount of γ phase and α-M phase slightly reduced and the amount of ε-M phase increased with the increase of heating time during heating at 620 ℃; the ACLE of the solid solution treated alloy was the lowest, and the ACLE of the alloy, which was 26.9×10-6 ℃-1,heated at 620 ℃ for 150 h was the highest.