不锈钢粉末冷等静压数值模拟与实验验证

通过冷等静压实验获得了不锈钢粉末的压力-密度关系,在模拟中用于表征材料的硬化特性。为了描述粉末的致密化行为,使用了ABAQUS有限元软件中的Cam-Clay模型,对粉末的冷等静压实验过程进行模拟,结果表明实验的尺寸与模拟的结果符合得较好,说明模拟中使用的参数设置是合理的。然后使用选择性激光烧结/冷等静压复合工艺制造球形制件,并对冷等静压过程进行模拟,结果表明制件变形比较均匀,实验的结果与模拟的结果符合得较好,密度的预测与实验结果比较吻合。通过模拟不仅为冷等静压工艺提供有益的指导,也为以后复杂试样的冷等静压尺寸设计提供了重要参考。

Simulation and Experiment of Cold Isostatic Pressing of Stainless Steel Powder

The relationship between pressure and density of stainless steel powder has been attained by Cold Isostatic Pressing experiments. It has been used to describe hardening property of material in simulation. To describe the compaction behaviour, the Cam-Clay model of ABAQUS/Standard finite element software has been used to simulate Cold Isostatic Pressing experiments. The results of experiment and prediction are compared that show a general good agreement which implies the parameters used in simulation are appropriate. Then a ball specimen formed by Selective Laser Sintering has been subject to Cold Isostatic Pressing that is also simulated. The results show that the deformation is uniform. The results of experiment and prediction show a general good agreement. And predicted density also accord with that of experiment. The simulation can not only give a useful direction to process of Cold Isostatic Pressing, but also supply important instruction to dimension design of complex-shape parts.