Modeling and Numerical Simulation of Quenching Process for SA508C1.3 Steel Forgings
In order to get good mechanical properties, quenching processes are used to maintain high cooling rates inside heavy steel forgings which have large geometric dimensions and weight. Modeling and numerical simulation of an air-water quenching process for an SA508C1.3 steel shell forging are discussed in this paper. Heat treatment of steels involves several coupled physical processes, such as heat transfer, phase transformation, diffusion and internal stresses. To modeling quenching processes, material properties, such as density, elastic module, yield strength, thermal conductivity, specific heat and linear expansion coefficient, are defined as functions of temperature, phase and chemical composites. Material properties were collected from hand books and obtained from experiments. Phase transformation data were obtained from continuous cooling and isothermal dilatometric tests. Temperature-phase transformation models provide basic models to calculate temperature and microstructure variances during quenching processes. It is hard to be free of minor defects in large steel forgings, controlling the internal stress level is important to keep large forgings safe during quenching. A metallo-thermo-mechanics model of SA508C1.3 steel is proposed to predict temperature, microstructure and internal stress evolution during quenching. The influence of transformation plasticity on quenching stress fields was considered in this model. The transformation plasticity parameters of pearlitic transformation and bainitic transformation were obtained by using uniaxial loaded tests. The multi-discipline model was applied to predicting the evolution of internal stresses during an air-water alternative quenching process, which was suggested to obtain high cooling rates in the core of the steel forging and lower internal stresses.
Quenching Modeling Heavy Forging Numerical Simulation
SHI Wei LIU Qiang JIN Jia-yu
Department of Mechanical Engineering,Tsinghua University,Beijing,P.R.China Key Laboratory for Advanc Tianjin Heavy Equipment Engineering Research Company,Tianjing,P.R.China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
405-410
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）