扫描速度对X90钢表面激光熔覆哈氏合金C276涂层耐蚀耐磨性能的影响  

Effects of Scanning Speeds on Corrosion and Wear Resistance of Laser Cladding Hastelloy C276 Coating on X90 Steel Surface

作　　者：丁清苗 李瑶治 王银娜 DING Qingmiao;LI Yaozhi;WANG Yinna(School of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;PetroChina Huabei Oilfield Jiangsu Gas Storge Company,Renqiu 062550,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]中国民航大学交通科学与工程学院,天津300300 [3]中国石油华北油田江苏储气库分公司,河北任丘062550

出　　处：《热加工工艺》2025年第2期28-34,38,共8页Hot Working Technology

基　　金：中央高校基金项目(3122019107)。

摘　　要：采用激光熔覆技术在X90钢基体表面制备哈氏合金C276涂层,研究了激光扫描速度对涂层组织与性能的影响。通过扫描电镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)分析熔覆层的微观组织、元素分布和物相组成,采用显微硬度计测试熔覆层的显微硬度,分别采用摩擦磨损实验机和电化学工作站测试熔覆层的耐磨损性和耐腐蚀性。结果表明,当扫描速度为8、12和16 mm/s时,随着扫描速度的增加,熔覆层组织明显细化,平均维氏显微硬度值增大,平均摩擦系数值减小,磨损量分别为7.6、3.4和6.2 mg/h,扫描速度为12 mm/s时制备的熔覆层具有最优的耐磨损性能。扫描速度为8 mm/s时制备的熔覆层具有最大的自腐蚀电位-241.053 mV和最小的腐蚀电流密度0.170μA·cm-2,相较扫描速度为12、16 mm/s时制备的熔覆层具有最优的耐电化学腐蚀性能。当扫描速度分别为8、12 mm/s时,哈氏合金C276涂层分别表现出最优的耐电化学腐蚀性能和耐磨损性能,选择合理的扫描速度可有效改善涂层的耐蚀耐磨性能。Hastelloy C276 coating was prepared on the surface of X90 steel substrate by laser cladding technology,and the effects of laser scanning speed on the microstructure and properties of the coating was studied.The microstructure,element distribution and phase composition of the cladding layer were analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and X-ray diffractometer(XRD).The Vickers microhardness of the cladding layer was tested by microhardness tester,and the wear resistance and corrosion resistance of the cladding layer were tested by friction-wear test machine and electrochemical workstation,respectively.The rusults show that when the scanning speed is 8 mm/s,12 mm/s and 16 mm/s,with the increase of scanning speed,the structure of the cladding layer is obviously refined,the average Vickers microhardness value increases,the average friction coefficient value decreases,and the wear amount is 7.6 mg/h,3.4 mg/h and 6.2 mg/h,respectively,and the cladding layer prepared when the scanning speed is 12 mm/s has the best wear resistance.The cladding layer prepared at the scanning speed of 8 mm/s has the most positive self-corrosion potential of-241.053 MV and the smallest corrosion current density of 0.170μA·cm-2.Compared with the cladding layer prepared at the scanning speed of 12 mm/s and 16 mm/s,it has the best electrochemical corrosion resistance.When the scanning speed is 8 mm/s and 12 mm/s,the Hastelloy C276 coating exhibits the best electrochemical corrosion resistance and wear resistance,respectively.Selecting a reasonable scanning speed can effectively improve the corrosion resistance and wear resistance of the coating.

关 键 词：哈氏合金C276涂层 激光熔覆技术 扫描速度 耐蚀性能 耐磨性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]