Numerical Simulation of Temperature Field of Low Alloyed Bainite Ductile Iron in Austempering

摘要

It has an great significance for making heat treatment technology by researching the law of temperature variations of ductile iron in austempering.Based on the three-dimensional finite element method (FEM),the temperature variations of low alloyed bainite ductile iron in austempering are studied in this paper.The temperature relativity of the thermal physical parameters is considered during building the model.The simulation result demonstrates that during the stage of rapid cooling,the cooling speed of the surface is faster than that of the center,and the whole cooling speed increases firstly,then decreases.During the stage of isotherm,the surface temperature of the sample increases to the isothermal temperature directly,while the center temperature decreases firstly,then increases,until to the isothermal temperature.