不同水基淬火介质对ZG30CrMnSiMo低合金钢组织和耐磨性的影响

通过扫描电镜、冲击试验机和动载冲击磨料磨损试验机等对低合金耐磨钢显微组织、力学性能和耐磨性能进行了分析。结果表明:铸态组织由珠光体和碳化物组成,铸态合金的宏观硬度为41.3 HRC,冲击吸收能量为6.1 J,磨损量为1.4378 g。经水玻璃(Na₂SiO₃)和PAG淬火后,显微组织均转变为回火板条马氏体和碳化物,宏观硬度分别为49.0 HRC和51.1 HRC,冲击吸收能量分别为7.3 J和9.4 J,磨损量分别为0.9378 g和0.8350 g。相比铸态合金,PAG淬火后合金的宏观硬度、冲击性能和耐磨性分别提高了23.7%、54.1%和1.7倍。相比水玻璃淬火,PAG淬火后合金钢的宏观硬度、冲击性能和耐磨性分别提高了4.3%、28.8%和1.1 倍。

Effect of different water-based quenching media on microstructure and wear resistance of ZG30 CrMnSiMo low alloy steel

Microstructure, mechanical properties and wear resistance of low alloy wear resistant steel were analyzed by means of scanning electron microscope, impact testing machine and dynamic load impact abrasive wear testing machine. The results show that the as-cast microstructure consists of pearlite and carbide, of which the macroscopic hardness, the impact absorbed energy and wear loss are 41.3 HRC, 6.1 J and 1.4378 g, respectively. And after quenching in sodium silicate (Na₂SiO₃) and PAG, the microstructure of the is both transformed into tempered lath martensite and carbide, of which the macroscopic hardness, the impact absorbed energy and wear loss are 49.0 HRC and 51.1 HRC, 7.3 J and 9.4 J, 0.9378 g and 0.835 g, respectively. Compared with the as-cast alloy, the macroscopic hardness, impact propekly and wear resistance of the PAG quenched steel are improved by 23.7%, 54.1% and 1.7 times, respectively. Compared with quenching in sodium silicate solution, the macroscopic hardness, impact property and wear resistance of the PAG quenched steel are improved by 4.3%, 28.8% and 1.1 times, respectively.