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为研究金属粉末热等静压(HIP)的致密化行为,采用Perzyna黏塑性流变模型,用有限元软件(MSC.Marc)实现316L粉末HIP过程的数值模拟.分析了粉末体在不同时刻的流动行为,同时研究不同阶段的致密化机制、压坯最终相对密度的分布及其变形.与试验结果对比表明:压坯的相对密度分布、变形趋势与试验结果符合得较好,尺寸预测的最大相对误差在8%以内,轴向精度优于径向的.通过数值模拟不仅为HIP工艺提供指导,也可为优化包套的结构设计提供重要参考.
In order to study the densification behavior of hot isostatic pressing (HIP) of metal powder, Perzyna visco-plastic rheological model was used to simulate the HIP process of 316L powder with finite element software (MSC.Marc) Flow behavior and the densification mechanism at different stages and the distribution and deformation of the final relative density of compacts.Compared with the test results, the relative density distribution and the deformation trend of the compacts are in good agreement with the experimental results, and the maximum size prediction The relative error is within 8%, and the axial accuracy is better than the radial.Numerical simulation not only provides guidance for the HIP process, but also provides important reference for the structural design of the optimized cladding.