Prediction of Internal Stresses, Phase Transformations and Research on Numerical Simulation of Quenching

摘要

Prediction of internal stresses and microstructures during quenching involves calculation of temperature variation and phase transformations, modeling of stress-induced transformation, modeling of transformation plasticity, and material parameters related with microstructure and temperature. Models of the influence of stress on phase transformations were established with modification of kinetic parameters. Transformation plasticity is the key factor affecting internal stresses and geometric distortion during quenching, mechanism of transformation plasticity and research works were reviewed. FEM software packages developed with temperature-microstructure-stress coupling models and successful applications to analysis of quenching process were introduced. Study on stress-induce transformation, transformation plasticity by authors was introduced, numerical results of internal stresses and microstructures of large-scale workpieces during quenching were given. Factors affecting calculation accuracy of stresses and volume fractions of phase transformations were discussed.