纳米颗粒变质剂对高铬铸铁组织和性能的影响

Study on effect of nanoparticles inoculants on microstructures and properties of high chromium cast iron

为提高高铬铸铁的韧性和耐磨性能,以15Cr Mo2Cu1为研究对象,研究纳米颗粒变质剂对高铬铸铁组织、硬度、韧性、耐磨性的影响。对变质处理前后高铬铸铁的硬度和韧性进行实验。结果表明:铸态未变质的组织中,M7C3型碳化物粗大,变质处理后,碳化物尺寸变小,形状由粗大板条状变为小块状;热处理后,变质高铬铸铁硬度平均值可达HRC64.15,冲击平均值可达12.7 J/cm2,提高了耐磨性。

This paper is aimed at studying the effects of nanoparticles inoculants on the microstruc- ture, hardness, impact toughness, and wear resistance of the 15CrMo2Cul using SEM, X-ray diffrac- tion, Rockwell hardness tester and pendulum impact testing machine and wear and abrasion test ma- chine. The results show that as-cast high chromium cast iron without modification contain coarse MTC3 carbide, which tends to become smaller after modification, allowing the morphology change from the coarse lath to the block of smaller size; the modified alloy subjected to heat treatment has an average hardness of up to 64.15HRC, and the average impact toughness of up to i2.7 J/cm2, contributing to a definite decrease in the wear weight loss and a significant improvement in the wear-resisting property and the impact toughness.