镍基高温合金磨削表面工艺性能试验研究

Experimental Study on Grinding Surface Processing Property of Nickel-Based Superalloy

为了探究镍基高温合金的磨削表面工艺性能,采用单因素试验的方法,分别进行镍基高温合金单晶DD5和多晶GH4169的平面槽磨削试验,得到砂轮线速度、磨削深度和进给速度对其表面质量的影响规律,并对磨削亚表面微观组织和磨屑形貌进行观察.结果表明:随着砂轮线速度的增大,表面粗糙度Ra不断减小;随着磨削深度和进给速度的增大,表面粗糙度Ra不断增大.在相同工艺参数下,多晶GH4169更容易加工,可磨削性能更好.随着砂轮线速度的增大,磨削亚表面出现塑性变形层且塑性变形作用减弱.磨屑主要有锯齿状和崩碎状等,其中锯齿状磨屑居多.

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.