Effect of phase transition on micro-grinding-induced residual stress

Abstract

Residual stress plays an important role in controlling the performance of high-precision martensitic steel parts, as it affects the properties of the material in various ways. At present, the dynamic evolution of the phase transition mechanism in residual stress generation is not yet fully understood, and there have been few quantitative studies on the effect of phase transitions on the residual stress generated in the micro-grinding process. In this study, flow stress was modeled by considering the specific volume and yield stress in the phase-transition process, and a user-defined constitutive model was developed. A finite-element model that simulates the movement and application of thermo-mechanical loading and phase transitions on the surface and subsurface of the machined material was developed to predict the residual stress generated by micro-grinding. The accuracy of the simulations and the effect of phase transitions on the residual stress were experimentally verified. The results showed that the effect of phase transitions on the residual stress was mainly reflected in the tangential subsurface. This study used a novel approach in the analysis of residual stress induced by micro-grinding and established two process optimization criteria for the reduction of residual stress. The results of this study provide a more comprehensive understanding of the phase transition and residual stress mechanisms governing the grinding process, which could potentially be useful for improving the reliability of high-strength martensitic steel components.