耐磨钢厚度截面组织性能演变规律

摘要：利用OLYMPUS GX71光学显微镜、场发射扫描电镜Quanta450和JEM2100F型透射电镜等手段对60mm厚淬火态以及淬火+回火态耐磨钢厚度截面组织性能演变规律进行了研究。结果表明，淬火态耐磨钢厚度截面呈表层硬度高、心部硬度低的梯度分布，回火后表层和心部呈现相反的变化趋势，心部/表面硬度比从70%升至93%，1/4处和心部冲击功降低。厚度截面组织和析出相的差异影响固溶强化和析出强化效果，是性能演变的本质原因，提高淬火冷却速度，改善淬火态厚度截面均匀性是提高性能均匀性和优化应用性能的根本方法。

Evolution of microstructure and properties of thickness section of wear resistant steel

By means of OLYMPUS GX71 optical microscope, field emission scanning electron microscope (FESEM) Quanta450 and JEM2100F transmission electron microscope (TEM), the evolution of microstructure and properties of thickness section of 60mm thick wear resistant steel at quenched and quenched + tempered state was studied. The results show that the hardness of quenched wear resistant steel is gradient distribution with high hardness on the surface and low hardness in the core. After tempering, the hardness ratio of core to surface increases from 70% to 93%, and the impact energy at 1/4 and center of the section decreases. The difference of thickness cross section microstructure and precipitation phase has great effects on solution strengthen and precipitation strengthen, which is the main reason of performance evolution. Increasing quenching cooling rate and improving the uniformity of quenched thickness section are the fundamental methods to improve uniformity and optimize application performance.