The carbide precipitation behavior of 35 wt%Cr–4 wt%C (35Cr–4C) Hypereutectic High Chromium Cast Iron (HHCCI) during heat treatment was investigated by means of scanning electron microscope and transmission electron microscope, and the effect of rare earth magnesium (RE-Mg) modification on the microstructure evolution and wear resistance of 35Cr–4C cast iron was also studied. The as-cast structure of 35Cr–4C HHCCI is mainly composed of primary carbides, eutectic carbides and austenite matrix. After quenching, there are secondary carbides M₇C₃ and M₂₃C₆ precipitation in the martensite matrix. After tempering, more secondary carbides will be formed and the main precipitate phase is M₂₃C₆. After heat treatment of RE-Mg modified HHCCI, more secondary carbides are precipitated, and the distribution in the matrix is more uniform, and the wear resistance is higher than that of unmodified HHCCI.

采用扫描电镜和透射电镜研究了35 wt%Cr–4 wt%C（35Cr–4C）过共晶高铬铸铁（HHCCI）在热处理过程中的碳化物析出行为，以及稀土镁的影响。还研究了 (RE-Mg) 改性对 35Cr-4C 铸铁的显微组织演变和耐磨性的影响。35Cr-4C HHCCI的铸态组织主要由一次碳化物、共晶碳化物和奥氏体基体组成。淬火后，马氏体基体中有二次碳化物M ₇ C ₃和M ₂₃ C ₆析出。回火后会形成较多的二次碳化物，主要析出相为M ₂₃ C ₆. RE-Mg改性HHCCI热处理后，析出的二次碳化物较多，在基体中分布更均匀，耐磨性高于未改性HHCCI。