论文部分内容阅读
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。
Plasma welding technology was used to improve the wear resistance of hydraulic valve core. Microstructure, phase and properties of the surfacing layer were observed by optical microscope, X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the overlay welding layer mainly consists of residual austenite dendrite and fine needle-shaped martensite. The average hardness of the overlay welding layer is 56 HRC, which is higher than that of the base material. This is mainly due to the formation of Markov Body and the formation of carbide (Cr, Fe) 7C3 can improve the hardness of surfacing layer, surfacing wear layer can effectively improve the service life of spool.