激光熔覆Fe基合金涂层微观组织与性能研究  

Study on Microstructure and Properties of Laser Cladding Fe Based Alloy Coating

作　　者：刘敬 路小江 钟善军 Liu Jing;Lu Xiaojiang;Zhong Shanjun(Ningbo Zhongyi Hydraulic Motor Co.,Ltd.,Ningbo 315200,Zhejiang,China;Binzhou Key Laboratory of Aeronautical Structural Parts Surface Engineering,Shandong University of Aeronautics,Binzhou 256600,Shandong,China)

机构地区：[1]宁波中意液压马达有限公司,浙江宁波315200 [2]山东航空学院滨州市航空结构件表面工程重点实验室,山东滨州256600

出　　处：《应用激光》2024年第7期57-66,共10页Applied Laser

基　　金：国家自然科学基金(52075047);山东省高等学校青创科技支持计划(2022KJ089);宁波市重大科技任务攻关项目(2022Z052)。

摘　　要：为提高45钢的表面性能,采用自行设计的新型Fe-Cr-Ni合金粉末,在45钢表面激光熔覆制备成型良好的Fe基合金涂层,分析熔覆层的微观组织及物相组成,并进行耐磨及抗高温氧化性能研究。研究结果表明,激光熔覆Fe基合金涂层组织均匀致密,涂层表面无明显裂纹、气孔等缺陷,物相主要为α-Fe、γ-(Ni-Cr-Fe)、γ-(Fe,Ni)、α-(Fe-Cr)以及Fe_(0.64)Ni_(0.36)金属间化合物;熔覆层的硬度达到720 HV,约为基体硬度的3.3倍;在60 N下进行干滑动摩擦磨损测试,熔覆层的摩擦系数为0.57,低于基体的摩擦系数0.73,熔覆层的平均磨损体积约为基体的18.8%;在500℃、700℃、900℃下经100 h高温氧化,熔覆层未出现氧化膜剥落现象,氧化增重分别为2.19 mg·cm^(-2)、5.11 mg·cm^(-2)、6.61 mg·cm^(-2)。To enhance the surface properties of 45 steel,a self-designed Fe-Cr-Ni alloy powder was utilized to fabricate a well formed Fe-based alloy coating via laser cladding.The microstructure and phase composition of this coating were thoroughly examined,and its wear resistance and high temperature oxidation resistance were evaluated.The results show that the microstructure of laser cladding Fe based alloy coating is uniform and compact,there are no obvious defects such as cracks and pores,and the main phase isα-Fe、γ-(Ni-Cr-Fe)、γ-(Fe,Ni)、α-(Fe-Cr)and Fe_(0.64)Ni_(0.36)intermetallic compounds;The hardness of the cladding layer reaches 720 HV,about 3.3 times of the matrix;Through the dry sliding friction and wear test,the friction coefficient of the cladding layer is 0.57,which is lower than that of the matrix.The wear volume of the cladding layer is 0.01 mm~3,which is 18.8%of the average wear volume of the matrix;After 100 h high-temperature oxidation,there was no peeling of oxide film on the cladding layer.At 500℃,700℃and 900℃,the oxidation weight gain was 2.19 mg·cm^(-2),5.11 mg·cm^(-2)and 6.61 mg·cm^(-2)respectively.

关 键 词：激光熔覆 Fe基合金涂层 微观组织 摩擦磨损 高温抗氧化性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]