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以磨削速度为150 m/s的金刚石单颗粒对K4169合金进行了高速磨削试验,探讨了K4169合金的显微组织和磨削形貌特征。结果表明,经过固溶和时效处理的K4169合金晶界处有少量碳化物,碳化物附近无其它针状脆性相;K4169合金基体组织中存在与基体保持良好共格或半共格关系的纳米级γ“析出相;K4169合金在高速金刚石磨粒作用下的磨痕入口和出口处形成了毛刺,磨痕表面光滑平整,局部区域存在少量黏着物;由于受到剪切滑移作用,K4169合金磨屑呈现出锯齿状特征。
K4169 alloy was subjected to high-speed grinding test with diamond single particles with grinding speed of 150 m / s. The microstructure and grinding morphology of K4169 alloy were discussed. The results show that there is a small amount of carbides in the grain boundaries of K4169 alloy after solution treatment and aging treatment, and there is no other needle-like brittle phase in the vicinity of carbides. In the matrix of K4169 alloy, there exists a nanoscale γ ”precipitated phase; K4169 alloy formed burrs at the entrance and exit of the wear scar under the action of high-speed diamond abrasive grains, the surface of the wear scar was smooth and smooth, and there was a small amount of adhesive in the local area. Due to the shear-slip effect, The crumbs show jagged features.