Numerical Study of Crack Initiation in Surface Hardened Ti_6Al_2V Alloy Based on the Residual Stress Analysis

摘要

In this study, a three-dimensional (3D) finite element model of residual stresses after thermo-force surface hardening is developed. Numerical solution of the coupled thermo-mechanical problem is considered. A mathematical model of the phase transition, based on a complex analysis of calculated data on the dynamics of temperature fields and continuous cooling temperature diagram is developed. The mechanical part of the model accounts for the thermoviscoplastic behavior of the material coupled with martensitic phase transformation. The simulated results for titanium alloy Ti_6Al_2V are present, non-uniform distribution of residual stresses and potential cracking zones is determined.