激光熔覆Ni基合金/碳化物涂层组织及冲刷腐蚀磨损性能  

Microstructure and Erosive-corrosive Wear Characteristics of Laser Cladding Stainless Steel with NiCr_3C_2 and NiWC

作　　者：张大伟[1] 张新平[2] 

机构地区：[1]温州大学工业工程学院 [2]温州大学法政学院

出　　处：《农业机械学报》2005年第3期126-130,共5页Transactions of the Chinese Society for Agricultural Machinery

摘　　要：在 2 Cr13马氏体不锈钢基材上激光多道搭接熔覆 Ni Cr3C2 和 Ni WC复合涂层 ,考察两种激光熔覆层的微观组织、显微硬度对冲刷腐蚀磨损性能的影响 ,并与不锈钢基材对比。试验结果表明 ,两种涂层具有不同的凝固组织特征。含有未完全溶解 WC硬质相的 Ni WC涂层比 Cr3C2 硬质相完全溶解的 Ni Cr3C2 双相涂层的显微硬度高出约 30 0 HV,两种激光涂层的冲刷腐蚀磨损速率分别比不锈钢基材降低 30 %和 6 0 %。冲刷腐蚀磨损抗力的提高与熔覆层的组织状态、碳化物种类和数量以及涂层的韧化性能等因素密切相关。The effects of microstructure and microhardness on erosive-corrosive wear (ECW) performance of a laser cladding Ni-Cr3C2 and Ni-WC composite coatings with overlapping tracks on a martensitic stainless steel with 0.2 percent carbon was investigated and compared with the stainless steel substrate. The test results show that two coatings have different solidification structures. The microhardness of Ni-WC coating contained WC particles of incomplete dissolution is about 300 HV higher than that of Ni-Cr3C2 coating of biphase structure in which the hard phase was completely dissolved. The ECW rates of Ni-Cr3C2 and Ni-WC decreased by approximately 60% and 30% respectively compared with that of the stainless steel substrate. The increase of ECW resistance is closely related to the structure feature of the cladding coatings, types and amounts of carbide, and the toughened ability of the coatings.

关 键 词：冲刷腐蚀 碳化物 NI基合金 涂层组织 激光熔覆层 显微硬度 CR3C2 基材 磨损性能 韧化 

分 类 号：S759[农业科学—森林经理学] TG174[农业科学—林学]