EVALUATION OF THE INITIAL RESIDUAL STRESS DISTRIBUTION AND MULTIPASS GRINDING TECHNIQUES ON FINAL RESIDUAL STRESSES DISTRIBUTION IN D2 STEEL

摘要

The purpose of this investigation is to correlate the residual stress behavior of D2 steel when subjected to two- and four-passes resulting in equivalent depth during grinding operations of two sets of parameters. Single-, double- and triple-tempering were performed on D2 steel samples followed by x-ray diffraction and microstructural material characterization. Hardness, cold work and surface residual stress measurements were collected at this stage of the study. Subsequently the samples were subjected to two different sets of grinding conditions to reevaluate material’s properties and surface integrity. Due to non-linearity of the residual stress superposition, the distribution pattern between the samples undergone two- and four-pass grinding was shown to be considerably different. Overall, the study identifies the characteristic relationship of pre-existing and final residual stress distribution characterizing multipass grinding.