Effect of powder initial distribution on densification of Ti6A14V powder during hot isostatic pressing

Inhalt:
A numerical model is established based on the plasticity theory to simulate the hot isostatic pressing (HIP) process considering the homogeneous powder distribution in the capsule and is then experimentally verified. In the numerical simulation, the initial relative density of the powder is subdivided into 4 gradients of 0.575, 0.625, 0.675 and 0.725, rather than generally used 0.65. The results show that different relative densities have a great influence on the final powder densification. The analysis of the numerical simulation results and the comparison with the experimental results indicate that the inhomogeneous distribution of initial powder density does exist in the actual experiment. For the capsule with large aspect ratio, this situation has a great influence, and the numerical simulation method considering this effect can reduce the relative error from 4.2% to 3.16%.