淬火温度对高速钢组织、力学性能和耐磨性的影响

Effect of quenching temperature on microstructure,mechanical properties and wear resistance of high speed steel

系统研究了不同淬火温度对高速钢组织、力学性能和耐磨性的影响。研究结果表明,热处理后高速钢由马氏体基体和碳化物(MC、M_(2)C、M_(6)C、M_(23)C_(6),M=Fe、V、Mo、W等)组成。淬火温度对碳化物形态结构变化有明显影响,随着淬火温度从1080℃增至1280℃,碳化物由网状结构变为孤立团球状,其形状因子K值从0.394提高至0.470。此外,高速钢的力学性能随淬火温度升高得以明显提升,1200℃淬火试样具有最佳综合性能,其硬度为63.0HRC,冲击功为7.5 J/cm^(2)。模拟抛丸机叶片服役工况,进行磨料磨损试验,磨损机制主要以微切削为主,微疲劳为辅。相比1200℃淬火试样,1080℃淬火试样的体积磨损量增加6.7倍。研究淬火温度对高速钢的影响,可为其他金属耐磨材料开发在热处理工艺技术方面提供了一种新的参考。

The microstructure,mechanical properties and abrasion resistance of high speed steels(HSSs)were systematically investigated to adjust different quenching process.The experimental results indicate that HSSs after heat treatment are composed of martensite matrix and carbides(MC,M_(2)C,M_(6)C and M_(23)C_(6),M=Fe,V,Mo,W,etc.).Morphology of carbides is greatly influenced by changes in quenching temperature.With the quenching temperature increasing from 1080℃to 1280℃,the morphology of carbides gradually changes from net-like to isolated spheroid,and shape factor K value of carbides increasing from 0.394 to 0.470.In addition,the mechanical properties of HSSs is obviously enhanced with increasing of quenching temperatures.After quenching at 1200℃,high speed steel has the best comprehensive properties,with hardness and impact energy values are 63.OHRC and 7.5J/cm^(2),respectively.To imitate the service condition of a shot blasting machine blade,a dry sand rubber wheel abrasive wear testing equipment was employed.Micro-cutting and micro-fatigue were the primary wear mechanisms.The volume loss of HSS of 1080℃ quenching sample is 6.7 times that of 1200℃ quenching sample.The research on the effect of quenching temperature on HSSs can provide a new reference for the development of other metal abrasion-resistant materials.