高速激光熔覆Ni基合金涂层对球墨铸铁表面改性的研究  

Study on Surface Modification of Ductile Iron by High-speed Laser Cladding Ni-based Alloy Coating

作　　者：王蕊 欧阳昌耀 李启航 赵春江[1] WANG Rui;OUYANG Changyao;LI Qihang;ZHAO Chunjiang(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Mechanical and Equipment Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]河北工程大学机械与装备工程学院,河北邯郸056038

出　　处：《热加工工艺》2023年第10期73-77,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51375325);山西省重点研发计划项目(201903D121051)。

摘　　要：为提高球墨铸铁的表面性能,采用高速激光熔覆技术在其表面制备了Ni基合金涂层。分析了该涂层的物相、表面硬度、耐磨性和耐腐蚀性。结果表明:Ni基合金涂层主要由γ-Ni、Cr23C6、Ni2Si及Ni3B相组成。涂层表面平均硬度约为球墨铸铁的1.58倍,磨损量相较于基体磨损量减少65.7%;涂层以磨粒磨损为主并带有少量的剥落坑,基体主要为黏着磨损。Ni基涂层的自腐蚀电位Ecorr比基体的提高187.1 m V,同频时阻抗值大于基体的,其耐蚀性优于球墨铸铁的耐蚀性。To improve the surface properties of ductile cast iron,the Ni-based alloy coating was prepared on the surface by high-speed laser cladding technology.The phase,surface hardness,wear resistance and corrosion resistance of the coating were analyzed.The results show that the Ni-based alloy coating is mainly composed ofγ-Ni,Cr 23 C 6,Ni 2 Si and Ni 3 B phases.The average hardness of the coating surface is approximately 1.58 times than that of ductile cast iron,and the abrasion loss is reduced by 65.7%compared with that of the substrate.The coating is primarily abrasive wear with a small amount of spalling pits,and the substrate is mainly adhesive wear.Compared with ductile cast iron,the self-corrosion potential E corr of Ni-base coating is increased by 187.1 mV,and the impedance value is greater than that of the substrate at the same frequency,and the corrosion resistance is better than that of ductile cast iron.

关 键 词：高速激光熔覆 NI基合金涂层 硬度 耐磨性 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]