烧结熔覆钢表面镍基合金涂层的组织和性能  

Microstructure and properties of Ni-based alloy coatings on steel surface by sintering cladding

作　　者：李新星[1,2,3] 王红侠 施剑峰[3] 韩雨洋 姜秋彤 刘缘 LI Xin-xing;WANG Hong-xia;SHI Jian-feng;HAN Yu-yang;JIANG Qiu-tong;LIU Yuan(Department of Materials Science and Engineering,Suqian University,Suqian 223800,China;Institute of Industrial Technology Research,Suqian University,Suqian 223800,China;Jiangsu Fengdong Thermal Technology Co.,Ltd.,Yancheng 224100,China)

机构地区：[1]宿迁学院材料科学与工程系,宿迁223800 [2]宿迁学院产业技术研究院,宿迁223800 [3]江苏丰东热技术有限公司,盐城224100

出　　处：《粉末冶金技术》2022年第3期245-250,共6页Powder Metallurgy Technology

基　　金：宿迁市科技计划资助项目(K202006);宿迁学院新型复合材料研究创新团队(2021td01);江苏省高校青蓝工程资助项目。

摘　　要：采用Ni25、Ni45、Ni60合金粉末通过烧结熔覆法在45钢表面制备出不同成分的镍基合金涂层。通过金相显微镜观察和X射线衍射分析等手段对合金涂层的组织形貌、相组成和界面结构进行研究,并对涂层显微硬度进行了测试。结果表明:通过烧结熔覆可以在45钢表面获得较为致密的镍基合金涂层。Ni25合金涂层组织主要为比较粗大的γ-(Ni,Fe)奥氏体以及少量的Cr_(23)C_(6)碳化物相;Ni45和Ni60合金涂层中除了γ-(Ni,Fe)奥氏体和Cr_(23)C_(6)碳化物之外,还出现了CrB硼化物。不同成分镍基合金涂层与45钢基体在界面处均形成了良好的冶金结合。当烧结温度1100℃、保温时间15 min时,涂层微观组织致密,硬质相颗粒尺寸较小,分布均匀。Ni60合金涂层的硬度最高,约为HV 735;Ni45合金涂层次之,约为HV 534;Ni25合金涂层硬度最低,只有HV 236。Ni-based alloy coatings on the 45 steel surface were prepared by sintering cladding method,using Ni25,Ni45,and Ni60alloy powders,respectively.The microstructure,phase composition,and interface structure of the alloy coatings were analyzed by metallographic microscope and X-ray diffractometer,and the microhardness of the coatings was tested.The results show that,the relatively compacted Ni-based alloy coatings on the 45 steel surface can be obtained by sintering cladding technology.Ni25 alloy coatings are mainly consisted of the coarseγ-(Ni,Fe)austenite and a small amount of Cr_(23)C_(6) carbide phase.In addition to theγ-(Ni,Fe)austenite and Cr_(23)C_(6) carbide phases,the CrB boride phases also appear in the Ni45 and Ni60 alloy coatings.All of the three Ni-based alloy coatings have the good metallurgical bonding with the 45 steel matrix.The coatings show the dense microstructure with the fine particles uniformly distributed in the matrix,when the sintering temperature is 1100℃ and the holding time is 15 min.The Ni60 alloy coatings have the highest hardness,about HV 735;that of the Ni45 alloy coatings are the next,about HV 534;and the Ni25 alloy coatings show the lowest hardness,only HV 236.

关 键 词：烧结熔覆 镍基合金 涂层 微观形貌 显微硬度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]