高碳中铬耐磨合金钢热处理后的组织及磨料磨损性能  

Microstructure and Abrasive Wear Resistance of High Carbon Medium Chromium Wear Resistant Alloy Steel After Heat Treatment

作　　者：宁嘉沛 郑开宏 周宏明[1] 王海艳 龙骏 NING Jia-pei;ZHENG Kai-hong;ZHOU Hong-ming;WANG Hai-yan;LONG Jun(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Guangdong Institute of Materials and Processing,Guangdong 510651,Guangzhou,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广东省材料与加工研究所,广东广州510651

出　　处：《铸造》2020年第2期135-141,共7页Foundry

基　　金：广东省科学院实施创新驱动发展能力建设专项(2017GDASCX-0117,2018GDASCX-0117);广州市对外合作项目(201807010085);广东省科技计划项目(2018dr013)。

摘　　要：研究了不同淬火温度对中铬合金钢微观组织及力学性能的影响,测试了不同碳含量的中铬合金钢热处理后的力学性能及耐磨性能,并分析其磨损机理。结果表明,在860-1020℃温度范围,淬火温度提高会使晶粒长大且使碳化物逐渐溶解,其硬度在碳化物溶解后显著降低,而冲击韧性随着淬火温度升高先降后增。含1.0%C的高碳中铬耐磨合金钢经过1000℃退火、980℃淬火、220℃回火热处理后,其微观组织以片状马氏体为主,有大量M7C3型碳化物小颗粒均匀分布,有较高的冲击韧性和优异的磨料磨损性能。An investigation was carried out to examine the effects of different quenching temperatures on the microstructure and mechanical properties of medium chromium wear-resistant alloy steel. The mechanical properties and wear resistance of the medium chromium alloy steels with varying carbon content after heat treatment were tested, and the wear mechanism was analyzed. The results show that, with increasing quenching temperature in the temperature range of 860-1 020 ℃, the grains in the microstructure trend to grow up and the carbides gradually dissolve, which result in a significant decrease in hardness. Moreover, the impact toughness first decreases and then increases. After annealing at 1 000 ℃, quenching at 980 ℃ and tempering at 220℃, the microstructure of high carbon medium chromium wear-resistant alloy steel containing 1.0% C is dominated by lamellar martensite, with a large number of M7 C3 type carbide particles evenly distributed throughout the matrix, which has ensured that the alloy steel has high impact toughness and excellent abrasive wear performance.

关 键 词：耐磨合金钢 淬火温度 磨料磨损 马氏体 M7C3 

分 类 号：TG172[金属学及工艺—金属表面处理]