3Cr2MnNiMo钢锻件等向性的有限元模拟研究

Study on isotropy of 3Cr2MnNiMo steel forgings based on finite element simulation

利用三维热力耦合有限元模型,对3Cr2MnNiMo钢锻造过程中锻件的温度场、应力场以及等效应变场进行了分析,预测了变形过程中的金属流动规律。通过对3Cr2MnNiMo钢进行热力模拟试验,获得该钢的高温热变形抗力,确定了其高温本构模型,并提出了采用方向累积变形功衡量锻件等向性的方法,对不同锻造方式锻件的等向性进行了分析。结果表明,采用热力耦合的方法分析不同的锻造过程,能反应锻造过程的基本特征,对减少生产成本,改善锻件成型质量具有重要意义。在有限元模拟条件下,采用方向累积变形功衡量锻件等向性符合实际,对优化锻造工艺有较好的指导作用。

The temperature field, stress field and equivalent strain field of 3Cr2MnNiMo steel during forging were analyzed by using three-dimensional thermo-mechanical coupled finite element model, and the metal flow law during the process was predicted. The high temperature thermal deformation resistance of 3Cr2MnNiMo steel was obtained through the thermal simulation test, and its high temperature constitutive equation was constructed. A method of measuring the isotropy of forgings by directional cumulative deformation work was proposed and the isotropy of forgings under different forging conditions was analyzed.The results showed that the thermo-mechanical coupling method could reflect the fundamental characteristics of the forging process, which improved the forging quality. Under the finite element simulation condition, the forging isotropy measured by the directional cumulative deformation work was well in line with reality and could direct the optimization of the forging process.