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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 difficult problem of laser cladding repaired layer of large-scale centrifugal pipeline compressor blades, a theoretical study on the integrated process of the laser cladding alloy and the repaired layer was carried out. The laser cladding layer was prepared on the KMN steel substrate by using Fe Cr alloy powder with different mass fraction of copper. The microstructure and phase composition of the repaired layer were observed by scanning electron microscopy, X-ray diffraction and energy spectrum analyzer ; Testing the microhardness of the repaired layer; testing the wear resistance of the repaired layer under room-temperature dry friction; collecting the vibration signals during the side-milling process of the repaired layer; analyzing the effect of copper mass fraction on the milling vibration and the surface roughness Impact. The results show that the addition of copper element plays the role of grain refinement. The hardness and wear resistance of the copper-containing layer are better than that of the copper-free layer. The milling vibration of copper-containing layer is significantly reduced, which effectively avoids Flutter appears.