等离子熔覆Fe基/WC-10Co-4Cr涂层的组织与性能研究  

Microstructure and Properties of Fe-Based/WC-10Co-4Cr Coatings by Plasma Cladding

作　　者：崔陈 朱协彬[1] 程敬卿 刘振华 韩顺顺 CUI Chen;ZHU Xie-bin;CHENG Jing-qing;LIU Zhen-hua;HAN Shun-shun(School of Materials Science and Engineering,Anhui Polytechnic University,Anhui Wuhu 241000,China;Anhui Dingheng Remanufacturing Industrial Technology Research Institute,Anhui Wuhu 241000,China)

机构地区：[1]安徽工程大学材料科学与工程学院,安徽芜湖241000 [2]安徽鼎恒再制造产业技术研究院,安徽芜湖241000

出　　处：《表面技术》2023年第7期167-176,230,共11页Surface Technology

基　　金：国家科技重点实验室基金(6142005180208)。

摘　　要：目的制备高强度和高硬度的耐磨性涂层,用于已磨损的机械零件表面,以延长其使用寿命,避免机器因磨损而带来的各种故障。方法采用等离子熔覆技术在40CrMnMo表面制备WC-10Co-4Cr/Fe300合金复合熔覆层,研究不同质量分数WC-10Co-4Cr对熔覆层组织和性能的影响。利用金相显微镜、超景深光学显微镜、SEM、EDS、XRD对熔覆层的组织形貌进行表征和物相分析,借助数显显微硬度计和销盘式摩擦磨损试验机测试熔覆层的硬度和耐磨性。结果WC-10Co-4Cr/Fe300合金作为一种复合材料,与基材形成了冶金结合,结合区域无孔洞和裂纹。熔覆层微观结构随着WC-10Co-4Cr含量的增加,逐渐由柱状晶向树枝晶过渡,它主要由Fe6W6C、(Cr、Fe)23C6和WC相组成。熔覆层的平均硬度大致随着WC-10Co-4Cr含量的增加而提高,当WC-10Co-4Cr的质量分数达到20%时,熔覆层的硬度最高(518.5HV0.2),大约是基体硬度的1.7倍。熔覆层的主要摩擦机理为磨粒磨损,随着WC-10Co-4Cr含量的增加,熔覆层的耐磨性得到显著改善。当WC-10Co-4Cr的质量分数为30%时,其磨损量比基体的总磨损量少0.0186 g,熔覆层的耐磨性最好。结论加入的WC-10Co-4Cr粉末与Fe300合金粉末反应生成了Fe6W6C、(Cr、Fe)23C6强化相,显著提高了熔覆层的硬度和耐磨性。The work aims to prepare wear-resistant coatings with high strength and hardness for the worn surface of mechanical parts,to prolong their service life and avoid various faults caused by wear.WC-10Co-4Cr/Fe300 alloy composite coatings were prepared on the surface of 40CrMnMo by the plasma cladding technology.The effects of WC-10Co-4Cr content in different mass fractions on the microstructure and properties of the coatings were studied.The microstructure and phase of the cladding layer were characterized by metallographic microscope,ultra depth of field optical microscope,SEM,EDS and XRD.The hardness and wear resistance of the cladding layer were tested by a digital display hardness tester and a pin disc friction and wear tester.The results showed that the coating surface had good continuity without obvious cracks and holes.There was a clear interface between the cladding layer and the matrix of each sample,a thin and narrow white bright band could be clearly seen,no obvious holes and cracks appeared in the bonding area,and the coating and the matrix showed good metallurgical bonding.From the microstructure of the cross section of the cladding layer,with the increase of WC-10Co-4Cr content,the solidification rate of the cladding layer decreased,the temperature gradient and the undercooling degree were large,so the cellular crystals at the bottom of the cladding layer gradually increased.The dendrite content in the middle of the cladding layer increased.The EDS results showed that when the mass fraction of WC-10Co-4Cr was 30%,more WC melts and diffuses into the Fe based alloy,and the W content decreased with the distance from WC particles.With the increase of WC-10Co-4Cr alloy powder,hard phases such as Fe2W2C,Fe3W3C,Fe6W6C,(Cr,Fe)23C6,WC and W2C were formed in the cladding layer,and the surface grains were refined.Therefore,the average hardness of the cladding layer had been significantly improved.When the mass fraction of WC-10Co-4Cr reached 20%,the hardness of the cladding layer was 518.5HV0.2,about 1.7 times th

关 键 词：等离子熔覆技术 WC-10Co-4Cr/Fe300合金 显微组织 硬度 耐磨性能 

分 类 号：TG455[金属学及工艺—焊接]