Study On Stress Field Numerical Simulation And Experiment In Atomized Gas Quenching Process

Many years ago, atomized gas cooling technology began to be used in industrial productions, and a series of breakthroughs and innovations were gotten. Atomized gas quenching technology has a strong quenching ability enough to ensure that the cooling speed of workpiece is greater than the critical speed, and the quenching cooling effect is remarkable. At the same time, the atomized gas as a new type of quenching medium is more and more attention with some advantages, such as strong controllability, cooling uniformity, pollution-free characteristics and so on. However, because atomized gas quenching technology starts late and is still in the exploratory stage experiment now, there are still some difficulties for the development of the quenching equipment and the effect of quenching test.In this paper, the analysis method of computer numerical simulation and experiment results is used to the thermal stress field numerical simulation of quenching process and analysis of the specimen’s residual stress after quenching and cooling. At first, the specimen’s incremental stress-strain relation is analyzed based on thermal elastic-plastic theory and related theory, and the definite condition of atomized gas quenching thermal stress, the nonlinear problem of the quenching thermal stress field and the quenching boundary conditions are studied. Then, the mathematics model and the grid model are built by the finite element analysis software ANSYS, the surface heat transfer coefficient and gas pressure are put into the boundary conditions to simulate and solve the thermal stress field and residual stress. Finally, the measuring residual stress experiment of the drilling method is designed to test and collect experiment data for specimen after atomized gas quench and cool. It shows effective for heat stress field numerical simulation of atomized gas quench by comparing the numerical simulation with experiment data.