铁基激光熔覆层的微观结构和摩擦磨损性能研究  

Microstructure,Friction and Wear Properties of Iron-Based Laser Cladding Coating

作　　者：李聪玮 刘泽 王明 张佳豪 杜双明[1] 刘二勇 LI Cong-wei;LIU Ze;WANG Ming;ZHANG Jia-hao;DU Shuang-ming;LIU Er-yong(School of Material Science and Engineering,Xi′an University of Science and Technology,Xi′an 710054,Shaanxi,China;Shennan Industry Development Co Ltd,Shaanxi Coal Group,Yulin 719300,Shaanxi,China)

机构地区：[1]西安科技大学材料与工程学院,陕西西安710054 [2]陕煤集团神南产业发展有限公司,陕西榆林719300

出　　处：《矿冶工程》2021年第5期149-152,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51705415);中科院海洋新材料与应用技术重点实验室开放课题(2018K01);陕西省重点研发计划项目(2020GY-115)。

摘　　要：选择市售的3种铁基粉末为原料(X_(1)~X_(3)),利用激光熔覆技术在45钢表面制备了3种熔覆层,研究了熔覆层微观结构和摩擦磨损性能,并选择电镀硬铬作为对比。结果表明,3种熔覆层组织致密,由α′马氏体、残余奥氏体和δ铁素体组成,其中X_(1)粉末熔覆层树枝晶更发达,晶粒更细小;X_(1)粉末熔覆层硬度明显高于X_(2)、X_(3)粉末熔覆层,但低于电镀硬铬;此外,3种熔覆层干摩擦系数虽与电镀硬铬接近,但耐磨性均明显优于电镀硬铬,且与其硬度呈正相关关系,磨损机理以磨粒磨损和疲劳磨损为主。With three kinds of iron-based powders(X_(1)~X_(3))as raw materials,three kinds of cladding layers were coated on 45 steel by laser cladding technology.The microstructure,friction and wear properties of the cladding layers were investigated,with which electroplated hard chromium layer was selected to compare.The results show that three kinds of cladding layers all have a compact microstructure and are mainly composed of α′-martensite,austenite andδ-ferrite phases.X_(1) powder cladding layer has more developed dendrites and finer grains.The hardness of X_(1) cladding layer is significantly higher than X_(2) and X_(3) cladding layers,but lower than electroplated hard chrome layer.In addition,three kinds of cladding layers have the dry friction coefficient closer to electroplated hard chromium plating,but have a better wear resistance,which has a positive correlation with the hardness.The mechanisms of wear are mainly abrasive wear and fatigue wear.

关 键 词：表面硬化 表面涂层 激光熔覆 铁基粉末 微观结构 摩擦磨损 电镀硬铬 

分 类 号：TG115[金属学及工艺—物理冶金]