摘要：针对磨削和铣削生产的汽轮机叶片叶根，采用体式显微镜、金相显微镜、电子扫描显微镜和X射线应力仪等设备对比分析了加工叶根表面形貌、微观组织、残余应力等表面质量的差异。分析结果表明：宏观上磨削、铣削加工叶根表面都很平滑，微观下磨削加工叶根表面完整性较差，存在一定的毛刺、凹坑等现象；磨削加工叶根表面微观组织中影响层及剧烈塑性变形层深度比铣削小；磨削、铣削加工叶根表面残余应力均为压应力，铣削加工叶根表面残余应力数值及深度都大于磨削加工。

关键词：叶根；磨削；铣削；微观表征；残余应力

中图分类号：TG580.6；TG54；TH161.14文献标志码：A

Quality Comparison of Grinding Surface and Milling Surface 

for 174PH Turbine Blade Root

Li Xingdong，Jiang Nan，Zhou Xinling，Huang Liang，Yue Caixu

Abstract:As for grinding and milling the turbine blade root，the surface morphology，microstructure and residual stress are analyzed by means of microscope，metallographic microscope，scanning electron microscope and Xray stress meter.The results show that the surfaces after grinding and milling are macroscopically smooth.But the surface integrity after grinding is relatively poor，since there exist burrs and pits.The depths of the impact layer and the severe plastic deformation layer in microstructure after grinding are smaller than those after milling. Compressive residual stresses exist in the surface after grinding and milling，and the value and depth of the residual stress after milling are greater than those after grinding.

Keywords:blade root；grinding；milling；micro characterization；residual stress