压扭工艺改善钼粉末温压成形的模拟分析

运用MSC.Marc有限元仿真软件,采用基于更新拉格朗日方法的热-机耦合分析方法,模拟了钼粉温压和温压扭成形过程,获得了2种工艺条件下的粉坯相对密度分布规律,验证了有限元模型的可靠性。结果表明:压扭工艺可以减小粉坯端面边缘处相对密度分布梯度,增大侧壁附近粉末变形量,并显著提高平均相对密度及相对密度分布的均匀性。

Simulation Study on Improvement of Molybdenum Powder Warm Compaction Process by HPT

The warm compaction and high-pressure torsion (HPT) process of molybdenum powder was simulated and analysed by MSC. MARC FEM software. The thermal mechanically coupled analysis method based on the updated Lagrangian Method was applied to simulate this process. The distributing rules of relative density in two technology conditions were obtained, and the reliability of FE model was validated. It is shown that HPT technology could decrease the distributing grades of relative density on the end face fringe of powder body, the transformation of powder near the side is increased. It is indicated that the average value and distributing uniformity of relative density are improved remarkably.