激光熔覆NiCrBSi涂层的高温摩擦行为  

High Temperature Wear Behaviors of Laser Cladded NiCrBSi Coatings

作　　者：余廷[1] 陈杰 饶锡新[1] 张子翔 Yu Ting;Chen Jie;Rao Xixin;Zhang Zixiang(School of Mechanical & Electrical Engineering, Nanchang University, Nanchaiig, Jiangxi 330031, China)

机构地区：[1]南昌大学机电工程学院

出　　处：《激光与光电子学进展》2019年第10期233-238,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51565035,51275303);江西省自然科学基金(20151BAB206045)

摘　　要：通过激光熔覆技术制备得到NiCrBSi涂层,分析了涂层的显微组织和物相,研究了不同温度下涂层的耐磨性能,讨论了700℃和750℃高温摩擦环境下显微组织演变和摩擦磨损机制,确定了涂层适用的工作温度区间。结果表明,涂层主要包括γ-Ni、Cr3C7、CrB和Ni-B-Si共晶组织;700℃时增强相Cr3C7和CrB保持稳定,共晶组织轻微分解,涂层的耐磨性较常温略有减弱,磨损机制为磨粒磨损和黏着磨损;750℃时CrB未分解,但Cr3C7和共晶组织明显分解,这导致涂层磨损和软化严重,在边缘形成飞边,涂层因严重塑性变形而失效。The NiCrBSi coatings are produced by the laser cladding technique.The microstructures and phases of these coatings are analyzed.The wear tests are carried out at different temperatures. The evolution of microstructures and the wear mechanism at high temperatures of 700 ℃ and 750 ℃ are discussed.The applicable working temperature range of coatings is determined.The results show that the coatings are mainly composed ofγ-Ni,Cr3C7,CrB,and Ni-B-Si eutectics.At the temperature of 700℃,the reinforced phases of Cr3C7 and CrB are kept stable,and the eutectics are slightly decomposed.The wear resistance is a little lower than that at room temperature,and the wear mechanism is adhesion wear and abrasion wear.In contrast,at the temperature of 750℃,Cr3C7 and the eutectics are obviously decomposed,but CrB is kept stable.As a result,the coating is severely worn and softened.Moreover,the fins are formed at its periphery.The coating is subjected to failure due to severe plastic deformation.

关 键 词：材料 激光加工 激光熔覆 NICRBSI合金 镍基合金 高温摩擦 工作温度 

分 类 号：TG142[一般工业技术—材料科学与工程]