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研究了一种快速凝固高温钛合金粉末热等静压(HIP)成形的致密化过程及其机制。当HIP成形温度低于500℃时,快速凝固高温钛合金粉末的颗粒相互靠近并重排,相对致密度由64.5%提高到81%,粉末颗粒间为点接触,没有发生明显的塑性变形;当HIP成形温度提高到500-700℃时,粉末颗粒发生显著的塑性变形,相对致密度迅速提高到97%;当HIP成形温度高于700℃后,粉末颗粒间的接触面较大,几何强化效应显著,外界压力不足以使粉末进一步变形,粉末体通过扩散蠕变完成致密化。
The densification process and mechanism of hot isostatic pressing (HIP) of a rapidly solidified high temperature titanium alloy powder were studied. When the HIP forming temperature is lower than 500 ℃, the particles of rapidly solidified high temperature titanium alloy powders are close to each other and rearranged, the relative density increases from 64.5% to 81%, and the powder particles are in point contact without obvious plastic deformation. When HIP When the forming temperature is increased to 500-700 ℃, the powder particles undergo significant plastic deformation and the relative density rapidly increases to 97%. When HIP forming temperature is higher than 700 ℃, the contact surface between powder particles is larger and the geometric strengthening effect is significant , External pressure is not enough to make the powder further deformation, the powder body by diffusion creep complete densification.