Grinding Residual Stress in Heat Treated Hardness Steels

Residual stresses in a high hardness specimen ground in various grinding conditions were measured, and the effects of various causes relating to the occurrence of residual stress were investigated. Specimens of S45C, SCM4, SNCM8, SK3, SUJ3 and SKS2 were prepared and these specimens were hardened to several ranges from Rockwell hardness HRC 30 to HRC 60 by quenching and tempering. As a result of this experiment, it is shown that the magnitude and distribution of grinding residual stress in high hardness specimens were greatly affected by the volume change due to tempering in grinding, and correlations between maximum residual stress and grinding temperature have linear relations which are characteristic for hardness of each specimen.