大型锻件淬冷过程数值模拟与实验验证

Numerical simulation and experimental validation of large forging during quenching process

为了了解和分析大型锻件在淬火过程中温度和组织场等的变化情况,应用非线性有限元软件MSC.Marc及其二次开发功能建立了二维有限元模型.综合考虑相变与温度的耦合关系、相变热的影响和热物性参数的非线性等问题,获得锻件淬火过程1/4截面上瞬态温度场和组织场的变化云图.材料的TTT转变曲线在AutoCAD软件环境下通过开发的程序实现动态调用.以35CrMo钢长圆柱大型锻件为对象,模拟了其淬火过程中温度和组织的转变过程.比较计算得到的温度曲线和实际测量结果表明,两者吻合较好.

With the nonlinear finite element （FE） software MSC. Marc and its subroutine files, a 2D FE model was developed to study temperature field and microstructure distribution of a large forging in quenching process. Some problems, such as coupling calculations between temperature and transformation, influence of transformation latent heat and nonlinearity of thermal property coefficients, were taken into account. Transient temperature field and microstructure distribution on a 1/4 section of the large forging in quenching process were calculated. A developed program under AutoCAD was used to transfer the TTT transformation curves dynamically. The model was used to simulate temperature and microstructure distribution of 35CrMo steel long-column large forging in quenching process. The obtained temperature results are in good agreement with experimental ones.