抽油杆接箍表面高速激光熔覆不锈钢涂层的组织与性能  

Microstructure and Properties of High Speed Laser Cladding Stainless Steel Coating on Sucker Rod Coupling Surfaces

作　　者：王彦芳 赵晓宇 陆文俊 潘辰妍 司玉冬 石志强 何艳玲 韩彬 Wang Yanfang;Zhao Xiaoyu;Lu Wenjun;Pan Chenyan;Si Yudong;Shi Zhiqiang;He Yanling;Han Bin(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,山东青岛266580

出　　处：《中国激光》2021年第6期169-178,共10页Chinese Journal of Lasers

基　　金：山东省自然科学基金(ZR2019MEM032);山东省重点研发计划(2019GGX102052);中石油重大科技项目(ZD2019-184-004)。

摘　　要：为提高抽油杆接箍表面的耐磨、耐蚀性能,利用高速激光熔覆技术在35CrMo抽油杆接箍表面制备了马氏体不锈钢涂层,并进行了激光重熔处理。采用光学显微镜、X射线衍射仪、硬度计、摩擦磨损试验机及电化学工作站研究了高速激光熔覆层和重熔层的组织结构、硬度、摩擦磨损性能与电化学腐蚀行为。结果表明:高速激光熔覆涂层表面平整均匀,表面粗糙度为15.7μm,无气孔、夹杂、裂纹等缺陷;重熔涂层的表面粗糙度可达5.4μm;高速熔覆涂层和重熔涂层均由单一的马氏体相组成;熔覆层呈现多层搭接的分层特征,熔覆层界面区为平面晶,中部为外延生长的树枝晶,表面为无明显方向的细小树枝晶;重熔使多层搭接特征基本消失,并细化了表层的树枝晶;高速激光熔覆涂层和重熔层的硬度均值分别为470 HV和494 HV。高速激光熔覆提高了基材的耐磨性及耐蚀性,激光重熔可进一步提高涂层的耐磨和耐蚀性。高速激光熔覆和重熔高性能涂层为抽油杆接箍的表面改性提供了新的思路和方法。Objective Sucker rod coupling failure is a major problem in sucker rod pumping systems,which are frequently used in oil fields worldwide.Surface modification of sucker rod couplings is an economical method to address this problem.High speed laser cladding(HSLC),which is proposed on the basis of laser cladding technology,is a novel additive manufacturing technology for surface modification.A HSLC modifies the relative positions of laser beam,spray powder,and molten pools,thus powder particles can be heated to their melting point before being guided into the molten pool.Due to limited transmitted laser energy,a micro-molten pool can form on the substrate such that a coating with low dilution ratio and metallurgical bonding is produced.The HSLC in this study has a higher cladding efficiency(500 cm^(2)/min)and a suitable coating thickness(25μm to 500μm),which overcomes the efficiency obstacle of conventional laser cladding technology.It provides a highly efficient and low-cost production method for the fabrication of thin coatings on sucker rod couplings to improve their surface properties(such as hardness,wear resistance and corrosion resistance).In this paper,martensitic stainless-steel coating is prepared on the surface of a35 CrMo sucker rod coupling by HSLC,followed by laser remelting(LRM),to explore a new way to improve wear resistance and corrosion resistance of the sucker rod couplings.Methods Martensitic stainless-steel powder,with particle diameters ranging from 15-53μm,is selected as the cladding material.Coatings are prepared by a ZKZM-4000 HSLC system.The laser cladding parameters are:3500 W laser power,7 m/min scanning speed,and 60%overlap ratio.The remelting parameters are:3500 W laser power,15 m/min remelting speed,and 50%overlap ratio.After the laser cladding and remelting processes,specimens are cut from the substrate,then mounted,ground,and polished for microstructure observation and property testing.The microstructure of the HSLC and LRM coatings are characterized by optical microscopy.The phas

关 键 词：激光技术 高速激光熔覆 激光重熔 马氏体不锈钢涂层 显微组织 耐磨性 耐蚀性 

分 类 号：V261.8[航空宇航科学与技术—航空宇航制造工程]