Finite Element Analysis of Pressure Influence on Densification of Titanium Alloy Powder under Hot Isostatic Pressing
Finite Element Analysis of Pressure Influence on Densification of Titanium Alloy Powder under Hot Isostatic Pressing
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DOI：
10.4028/www.scientific.net/kem.450.206
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
G. Liu;Yusheng Shi;Q. Wei;Ji Wei Wang
中科院分区：
文献类型：
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作者：
G. Liu;Yusheng Shi;Q. Wei;Ji Wei Wang
为了研究压力对热等静压下金属粉末致密化行为的影响，采用有限元方法研究了热等静压过程中不同压力下Ti6Al4V粉末的固结。采用粘塑性Perzyna模型，结合改进的多孔金属材料屈服准则，描述了致密材料在高温高压下的塑性和蠕变现象。采用有限元程序MSC.Marc进行了热-力耦合分析。计算结果表明，致密体的密度分布不均匀，但随着施加压力的增加，密度分布不均匀的现象逐渐减少。施加压力对致密化速率有显著影响。讨论了粉末压实的固结机理。
To investigate the influence of pressure on densification behavior of metal powder under hot isostatic pressing (HIP), the consolidation of Ti6Al4V powder at various applied pressures during HIP processes were investigated by finite element method in this paper. The plasticity and creep phenomenon of the compact under high temperature and pressure were described by the viscoplastic Perzyna model, which integrated with a modified yield criterion for porous metal materials. The thermo-mechanical coupling analysis was carried out by the finite element code MSC.Marc. The calculated results show non-uniform density distributions for the compact, but this phenomenon decreases as increasing the applied pressure. The densification rate is significantly influenced by applied pressure. The consolidation mechanisms for powder compact were also discussed.