Through the heat treatment of 0.8Cr–2.2Mn–0.3Mo–1.0Si–0.004B–0.45C (wt%) bainitic steel (i.e., 45Mn2 bainitic steel), the influence of different heat treatment parameters on microstructure evolution and mechanical properties of 45Mn2 bainitic steel was studied. Optical microscope, Scanning electron microscope, X-ray diffraction, hardness testing and abrasion testing were used for analysis. The results show that the microstructure of 45Mn2 bainitic steel after quenching is lower bainitic ferrite + residual austenite + M/A. When the austenitizing temperature increases, the volume fraction of residual austenite and M/A increases, and the hardness and abrasion resistance first increase and then decrease. At 910 °C, the hardness is the highest, while the wear resistance is the best. After quenching at 910 °C and different tempering temperatures, it is found that the microstructure has no obvious change, and the hardness and wear resistance are the highest when tempered at 240 °C.

通过对0.8Cr–2.2Mn–0.3Mo–1.0Si–0.004B–0.45C（wt％）贝氏体钢（即45Mn2贝氏体钢）进行热处理，不同热处理参数对合金的组织演变和力学性能的影响。研究了45Mn2贝氏体钢。使用光学显微镜，扫描电子显微镜，X射线衍射，硬度测试和磨损测试进行分析。结果表明，淬火后的45Mn2贝氏体钢的组织为低贝氏体铁素体+残余奥氏体+ M / A。当奥氏体化温度升高时，残余奥氏体和M / A的体积分数增加，硬度和耐磨性先升高后降低。在910°C下，硬度最高，而耐磨性最佳。在910°C和不同的回火温度下淬火后，