Computer Simulation Of Quenching Process

Quenching is an important method of optimizing the structure of the work-piece. With the development of computer technology, the computer simulation of quenching process has become the effective method in studying the intercoupling and interacting of the fields of temperature, structure and stress.First, the temperature-dependent properties of material and the phase change are taken into account in this paper. And the computer simulation of the temperature field is based on the law of the first thermodynamics. This is a base for further studying the fields of the structure and stress.Secondly, using the principle of cubic spline and FORTRAN, the incubation period is calculated of the 40Cr at different cooling speed, namely the temperature spots of the structure change. Then according to the formula, the transition amount of martensite is calculated and the structure difference of butt end is compared with the diameter at smaller end. The metallurgical structure is analysed. All above prove that the analog result is compliant with calculated result. Other materials can use the program. This make the material's data base more abundant. Last, the kinds of stress fields is calculated on cross-sections with the help large-scale finite element software MARC, based on incremental theory and corresponding elasto-plasticity constitutive equations, but also assuming the material meeting the Prandtl—Reuss plastic flow law and accounting for the nonlinear and phase transformation plasticity.By means of simulation, the fields of temperature ,structure and stress of arbitrary points and hours can be observed. And it is a base for further studying mathematical model and intellect in the course of quenching.