淬火温度对铬钼马氏体耐磨钢组织和力学性能的影响

Effect of Austenitizing Temperature on Microstructure and Mechanical Properties of Chrome-molybdenum Matensite Wear-resistant Steel

对含0.35%C、1.49%Si、1.64%Mn、1.66%Cr、0.34%Mo、0.12%V、0.025%Ti和0.02%Nb(质量分数)的铬钼马氏体耐磨钢分别进行了880、900和920℃油淬随后200℃回火。采用光学显微镜、扫描电子显微镜、冲击试验机和电子探针等研究了淬火温度对钢的组织和力学性能的影响。结果表明:随着淬火温度从880℃提高至920℃,钢的冲击吸收能量从31 J增加到了58 J;硬度先增加后降低,900℃淬火的钢硬度最高,为52 HRC;900℃淬火、200℃回火的钢马氏体最细小,且有细小的含Ti、V等合金元素的碳化物,因而其耐磨料磨损性能最佳。

A type of chrome-molybdenum martensite wear-resistant steel containing 0.35%C,1.49%Si,1.64%Mn,1.66%Cr,0.34%Mo,0.12%V,0.025%Ti,and 0.02%Nb by mass was quenched from 880,900 and 920℃ in oil and then tempered at 200℃,respectively.Effect of the austenitizing temperature on microstructure and mechanical properties of the steel was investigated by the aid of optical microscope,scanning electron microscope,impact testing machine and electron probe.The results showed that as the austenitizing temperature increased from 880 to 920℃,the impact absorption energy increased from 31 to 58 J,the hardness increased at first and then decreased,and the steel quenched from 900℃ exhibited as maximum hardness as 52 HRC.The steel quenched from 900℃ and tempered at 200℃ had the finest martensite and carbides containing alloying elements such as titanium and vanadium,and thereby the best resistance to abrasive wear.