Hot isostatic pressing (HIP) is widely used today to eliminate internal defects in Ti-6Al-4V produced by powder bed fusion. The HIP process will improve the ductility and especially the fatigue properties of the material. In some cases the strength of AM Ti-6Al-4V is reduced by the HIP-ing due to coarsening of the very fine as-printed microstructure due to the elevated temperature during the HIP process. This paper presents an investigation of HIP parameters for EBM Ti-6Al-4V performed by Arcam AB and Quintus Technologies AB with the aim to maximize the strength of HIP-ed EBM Ti-6Al-4V. A low HIP temperature of 800 °C gives the highest strength and is also enough to eliminate all internal defects. By printing material with intentionally induced porosity by a larger line off-set than standard combined with an optimized HIP cycle the highest strength can be obtained.
- Learn the optimum HIP parameters for AM Ti64
- Understand why it is important to tailor-make your HIP recipe based on the characteristics of the material to be HIP-ed
- Understand how the printing parameters can be changed and optimized for HIP-ing