Numerical Simulation of Temperature Field of Plasma Arc Remelting on QT600

摘要

Plasma arc remelting treatment was conducted on QT600 nodular iron. The microstructure and the micro-hardness in the melted zone and heat affected zone were studied by optical microscope and micro-hardness tester. Then in view of the thermal physical parameters of material, latent heat and a travel heat source, a 3D FEA model of transient temperature field of three-dimension moving about plasma arc remelting on QT600 was established based on ANSYS software. The APDL (ANSYS Parametric Design Language) was used to describe the evolvement rules of the temperature field. The result show that the microstructure of the remelting zone is pearlite, Ledeburite, its microhardness reaches 1000~1060 HV, and the simulation results of remelting shape are in accordance with the experimental results. Temperature near the surface of the weld pool is the highest, and up to about 1794.°C The investigation provides a guide for study on the validity of simulation and optimization of the process parameters in the subsequent experiment.