Prediction of Microstructures and Mechanical Properties of the Quenched Wheels based on FEM method- CANCELLED

The FEM simulation of temperature and transformation of super-cooled austenite in the wheel has been performed during its spraying quenching process, and the final microstructures and mechanical properties have been predicted. The cooling curves on some points of the wheel were obtained through the thermocouples placed in wheel subjected to spraying quenching. The heat transfer coefficient between wheel surface and spraying water was calculated by inverse heat conduction method. The isothermal austenite decomposition experiments have been performed under different temperature to get the pearlite with different lamellar spacing characterized by SEM, and mechanical tests have also been carried out to determine the mechanical properties such as tensile strength, yield strength and impact toughness. The relations between transformation temperature, lamellar spacing of pearlite and mechanical properties was thus established. The introduction of these relations in quenching simulation makes it possible to predict the final mechanical properties in the quenched wheel. Validation experiments show that the simulation results fit well with those tested in practical manufacture. The present study provides solid basis for quenching process optimization and ensure the products quality