Investigation on size effect of surface roughness and ...
2021-6-1 · , the surface roughness values of the specimen under different grain size are obtained as shown in Fig. 14. As the grain size is 50 μm, 65 μm, 90 μm, 119 μm and 150 μm, respectively, the surface roughness of specimen is 0.84 μm, 0.91 μm,