Effects of the cooling mode on the integrity and the multi-pass micro-scratching wear resistance of Hardox 500 ground surfaces

Abstract

In this paper, effects of the cooling mode used in grinding of Hardox 500 on the material grindability, ground surface integrity, and multi-pass micro-scratching wear resistance are investigated. Three modes are experimented: dry grinding, soluble oil, and cryogenic cooling modes. Results showed that the cryogenic cooling achieved high levels of work hardening and compressive residual stresses. Moreover, it was found that the cryogenic cooling improves the multi-pass micro-scratching wear resistance of Hardox 500 comparatively with the polished state and ground surfaces under dry or soluble oil conditions. The improvement rates of the wear volumes generated by the cryogenic cooling represent 46% and 63% of the volumes generated for the polished state when scratch load of 10 N and 20 N were applied respectively. These improvements are discussed based on the integrities of the scratched surfaces and sub-surfaces.