Inclusion of initial powder distribution in FEM modelling of near net shape PM hot isostatic pressed components
Inclusion of initial powder distribution in FEM modelling of near net shape PM hot isostatic pressed components
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DOI：
10.1179/1743290114y.0000000087
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发表时间：
2014-09
影响因子：
1.4
通讯作者：
C. V. Nguyen;A. Bezold;Christoph Broeckmann
中科院分区：
文献类型：
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作者：
C. V. Nguyen;A. Bezold;Christoph Broeckmann
粉末冶金热等静压（HIP）零件的最终形状是由多种因素决定的，包括胶囊的形状和尺寸、热等静压前粉末的初始密度分布以及热等静压工艺参数。目前的HIP模拟通常假设胶囊内的粉末是均匀的，无法预测非均匀收缩。因此，本工作的目的是开发一种方法来定量确定用不同技术预压的HIP胶囊内的初始粉末密度分布。实验得到的相对密度分布作为数值模拟的初始条件。并与仿真结果进行了比较。本文展示了最终形状对初始粉末密度分布的敏感性，并说明了将初始粉末分布引入有限元模型以提高近净形HIP仿真质量的必要性。
The final shape of powder metallurgy hot isostatic pressing (HIP) components is determined by many factors, including the shape and size of the capsule, the initial density distribution of the powder before HIP, and HIP process parameters. Current HIP simulation, which usually assumes that the powder inside the capsule is homogeneous, cannot predict non-uniform shrinkage. Therefore, the purpose of this work is to develop a methodology to quantitatively determine the initial powder density distribution inside HIP capsules, which were precompacted by different techniques. The relative density distribution obtained from experimental work is used as the initial condition for numerical simulations. The final shapes of the capsules produced by HIP are compared to simulation results. The paper shows the sensitivity of the final shape on the initial powder density distribution and illustrates the need to implement the initial powder distribution into the finite element model to improve the quality of the near net shape HIP simulation.