Abstract: Plane slot grinding single factor experiments of nickel-based single crystal superalloy DD5 and polycrystalline superalloy GH4169 were conducted in order to explore the grinding surface processing property of nickel-based superalloy. The influence of grinding wheel linear speed， grinding depth and feed rate on grinding surface quality was concluded. The grinding subsurface microstructure and grinding debris morphology were observed. The results show that: with the increase of grinding wheel linear speed， the grinding surface roughness R_○a decreases; with the increase of grinding depth and feed rate， the grinding surface roughness R_○a increases. With the same process parameters， the GH4169 is easier to machine and has better grinding performance than the DD5. With the increase of grinding wheel linear speed， a plastic deformation layer appears on the grinding subsurface and plastic deformation action is weakened gradually. The grinding debris mainly presents the serrated and crumbled features， and the serrated debris is dominant.

Key words: nickel-based superalloy, grinding, surface, single factor experiment, subsurface, grinding debris