摘要
为了满足工程机械齿轮高硬度、常温和高温耐磨性的要求,采用双层辉光等离子表面改性技术在齿轮钢基体上制备了W-Mo共渗层,对W-Mo共渗层的成分与显微形貌进行了分析,并与齿轮钢基体和固体渗碳层的硬度和耐磨性能进行了对比分析。结果表明：W-Mo共渗层与基体之间形成了厚度约为3 mm的扩散层,改性层与基体实现了良好的冶金结合,改性层中未见裂纹、气孔或者夹杂等缺陷存在;齿轮钢基体、固体渗碳试样和W-Mo共渗试样中,W-Mo共渗试样的纳米硬度和弹性模量都为最大值,其次为固体渗碳试样;温度为25、350和500℃时,W-Mo共渗试样的平均摩擦因数最小,磨损体积从高至低顺序都为齿轮钢基体〉固体渗碳试样〉W-Mo共渗试样,不同温度下W-Mo共渗试样都具有更高的耐磨性能,这主要与W-Mo共渗改性层自身的高硬度以及高温磨损条件下表面会形成一层W、Mo氧化物保护膜而起到减磨作用有关。
In order to meet high hardness,normal temperature and high temperature wear resistance requirement of engineering machinery gear,the W-Mo modified layer was prepared on the gear steel substrate by double glow plasma surface modification technology,the composition and microstructure of the W-Mo modified layer were analyzed,and the hardness and wear resistance of the modified layer were compared with those of gear steel matrix and solid carburized layer. The results showed that a diffusion layer with a thickness of 3 mm is formed between the W-Mo modified layer and the substrate,which has good metallurgical bonding with the substrate,and no cracks,pores or inclusions exist in the layer. In the gear steel matrix,solid carburized sample and W-Mo modified sample,the hardness and elastic modulus of W-Mo modified specimen have maximum values,followed by solid carburized sample; when the temperature is 25 ℃,350 ℃ and 500 ℃,the average friction coefficient of W-Mo modified specimen is minimum,the wear volume from high to low order are gear steel matrix 〉carburized specimens 〉W-Mo modified samples,W-Mo modified samples have much higher wear resistance under different temperatures,this is mainly related to the high hardness of the W-Mo modified layer and the formation of W and Mo oxide protective film on the surface under high temperature which can play a role of wear reduction.
作者
万海鑫
马思远
刘立峰
罗思琪
王冠杰
Wan Haixin;Ma Siyuan;Liu Lifeng;Luo Siqi;Wang Guanjie(Fuyang Vocational and Technical College,Anhui Fuyang 236031,China;College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Jiangsu Nanjing 210016,China;School of Materials Science and Engineering,Jiangsu University,Jiangsu Zhenjiang 212013,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第8期77-83,共7页
Heat Treatment of Metals
基金
安徽省省级质量工程示范实验实训中心支持计划(2016SXZX033)
安徽省高校领军人才引进与培育计划项目高校优秀青年人才支持计划(gxyq ZD2016546)
关键词
齿轮钢
W-Mo共渗层
显微形貌
力学性能
摩擦磨损
gear steel
W-Mo modified layer
micromorphology
mechanical properties
friction and wear
