阀芯堆焊耐磨层的组织与性能  

Microstructure and Properties of Surfacing Wear-resistant Layer for Valve Core

作　　者：太平 黄江华 毛为乙 周玉柱 

机构地区：[1]三一重工股份有限公司,湖南长沙410100

出　　处：《热加工工艺》2015年第9期191-192,共2页Hot Working Technology

基　　金：国家科技支撑计划项目(2012BAF02B00)

摘　　要：采用等离子堆焊技术提高液压阀芯耐磨性,用光学显微镜、X射线衍射仪(XRD)、扫描电镜(SEM)对堆焊层进行组织观察、物相和性能分析。研究结果表明,堆焊层主要由残余奥氏体枝晶和细小针状马氏体组成;堆焊层平均硬度56 HRC,较基体材料硬度有所提高,主要由于堆焊层中获得的马氏体以及形成的碳化物(Cr,Fe)7C3均可提高堆焊层的硬度,所以堆焊耐磨层能有效提升阀芯使用寿命。By plasmas surfacing welding, the abrasion resistance of hydraulic valve core can be improved. Optical microscope, X-Ray diffraction instrument（XRD） and scanning electron microscopy（SEM） were adopted to analyze the microstructure, phase and performance of the surfacing welding layer. The research results show that surfacing welding layer is mainly composed of retained austenite dendrites and tempered martensites. Both martensite and carbides（Cr,Fe）7C3can improve the hardness, so the average hardness of the surfacing welding layer is up to 56 HRC, which is higher than base material. So the surfacing welding layer can effectively improve the service life of valve core.

关 键 词：堆焊 耐磨层 阀芯 寿命 再制造 

分 类 号：TG455[金属学及工艺—焊接]