铜元素对FeCr合金激光熔覆层性能影响及铣削加工减振机理研究  

Effect of Cu on Properties of Fe Cr Laser Cladding Layer and Machining Vibration Suppressing in Side Milling

作　　者：赵彦华[1,2] 孙杰[1,2] 李剑峰[1,2] 

机构地区：[1]山东大学机械工程学院,山东济南250061 [2]高效洁净机械制造教育部重点试验室,山东济南250061

出　　处：《中国激光》2015年第3期53-61,共9页Chinese Journal of Lasers

基　　金：国家973计划(2011CB013403);泰山学者建设工程资助

摘　　要：针对大型离心式管线压缩机叶片激光熔覆修复层难加工问题,进行激光熔覆减振合金配方与修复层铣削加工一体化工艺理论研究。使用添加不同质量分数铜元素的Fe Cr合金粉料在KMN钢基体上制备激光熔覆修复层;通过扫描电镜、X射线衍射仪及能谱分析仪对修复层微观组织及物相组成进行观察分析;对修复层显微硬度进行测试;对修复层室温干摩擦情况下的耐磨性进行测试;采集修复层侧铣过程中的振动信号,分析铜元素质量分数对修复层铣削振动及表面粗糙度的影响。结果表明,铜元素的加入起到细化晶粒的作用,含铜修复层的硬度、耐磨性均优于不含铜元素的修复层;含铜修复层铣削振动有显著降低,有效避免了颤振出现。Aiming at the processing difficulties of laser cladding remanufacturing layer of large centrifugal pipeline compressor blade, cladding damping alloy formula and repaired layer milling process theory are investigated. The laser cladding repaired layers are prepared by Fe Cr alloy and Cu mixed powder on KMN steel substrate. The microstructure, phase constitution, hardness and wear resistance of the repaired layer are investigated by scanning electron microscope, X- ray diffractometer, energy dispersive spectrometer, Vickers digital micro-hardness tester, sliding wear tester and optical profiler. Vibration signal is collected during side milling process of repaired layer. The impact of Cu on machining vibration and surface roughness is investigated. The results show that, the grain size decreases dramatically and the microstructure of repaired layer is refined with the Cu content increasing. The hardness and wear resistance of coatings with Cu are improved significantly. Machining vibrations of repaired layer with Cu are obviously reduced, and the chatter is effectively avoided occurring.

关 键 词：激光技术 铜元素 晶粒细化 侧铣 加工振动抑制 

分 类 号：TG249[金属学及工艺—铸造] V261.23[航空宇航科学与技术—航空宇航制造工程]