初始相对密度分布对Ti6A14V粉末热等静压致密化过程影响的数值模拟

Numerical simulation of the effect of initial relative density distribution on densification process of Ti6A14V powder during hot isostatic pressing

为研究热等静压(HIP)过程中不同初始相对密度分布对钛合金粉末致密化行为的影响,采用有限元软件(MSC.Marc)对Ti6A14V合金粉末HIP过程进行数值模拟。对比分析了粉末合金在某一时刻的流变行为,同时对不同阶段的致密化机制进行研究,分析了不同初始相对密度分布对压坯最终成形的影响。结果表明:考虑初始相对密度分布,压坯的模拟结果更加接近试验结果,其中最大相对误差在1.2%以内。通过数值模拟可对零部件的HIP工艺过程进行预测,为HIP工艺提供指导,同时为复杂零部件的热等静压近净成形(NNS-HIP)奠定基础。

To investigate the effect of initial relative density distribution on the densification behavior of titanium alloy powder during hot isostatic pressing (HIP),the finite element software (MSC.Marc) was used to simulate HIP process of Ti6A14V metal powder. The rheological behavior of the powders under different relative density distributions was compared. Meanwhile, the densification mechanism at different stages and the effect of different initial relative density distributions on the final forming of compacts were investigated. The results indicate that the simulated degree of deformation in consideration of the initial relative density inhomogeneous distribution is consistent with the testing results. The maximum relative error for deformation is less than 1.2%. The numerical simulation can predict the HIP process, provide a guidance, and build a basis for optimal design of complex shape containers.