摘要
采用金相显微镜和洛氏硬度计研究淬火温度、冷却方式和回火温度对高铬铸铁组织和硬度的影响,并采用MLD-10型冲击磨料磨损试验机进行磨损试验,研究高铬铸铁的抗磨粒磨损性能和磨损机理。研究结果表明:本试验的最佳热处理工艺为970℃×2 h风冷+水雾淬火+460℃×4 h回火;高铬铸铁的磨损量随冲击功的增加而增大;在低冲击功条件下,高铬铸铁的磨损以显微切削为主,凿削磨损较少;随冲击功的增加,凿削磨损作用明显增强,磨损以显微切削和脆性断裂为主;当冲击功较大时,高铬铸铁的磨损机制主要是凿削磨损和切削磨损共同作用,此时还存在部分疲劳磨损现象。
Effects of quenching temperature,cooling methods and tempering temperature on microstructure and hardness of high chromium cast iron were researched by metallographic microscope and Rockwell hardness test.And abrasion wear tests were carried out by the MLD-10 impact abrasive wear testing machine.The abrasion wear resistance and abrasion mechanism of high chromium cast iron were investigated.The results show that in this experiment,the optimum heat treatment process is at 970 ℃ for 2 h and then wind cooling＋spray quenching,tempering at 460 ℃ for 4 h.The wear mass lose of high chromium cast iron increases with the raise of impact energy.At low impact energy,the wear mechanism of high chromium cast iron is mainly micro cutting,not gouging abrasion.With the increase of impact energy,gouging abrasion effect obviously enhances,and the main wear mechanism is micro-cutting and brittle fracture.When the impact energy is higher,the main wear mechanism of high chromium cast iron is gouging abrasion and cutting wear together,meanwhile,there is some fatigue wear phenomena.
出处
《热加工工艺》
CSCD
北大核心
2015年第10期220-225,共6页
Hot Working Technology
基金
昆明市科技型中小企业技术创新基金资助项目(CJ2009019)
关键词
高铬铸铁
热处理
显微组织
硬度
磨粒磨损机制
high chromium cast iron
heat treatment
microstructure
hardness
abrasion wear mechanism
