Study on Hot Isostatic Pressing Of Titanium AM Parts
A technology study on Hot Isostatic Pressing cycles optimized for Additive Manufacturing.
Study description
Ti-6Al-4V is the most common used alloy in Additive Manufacturing and predominantly used in aviation and the medical industry. These demanding industries have very high requirements on static mechanical and often fatigue properties. Therefore, the HIP process has become a standard postprocess for eliminating residual porosity in high-performance parts. However, due to lack of standardization and accessible HIP capacity, the common HIP treatment for Additive Manufacturing parts, today, is still derived from temperature-pressure-cycles optimized for casting. To advance the knowledge on HIP treatments for AM parts, while enhancing AM specific material properties, AMPOWER investigates and optimizes HIP cycles for LB-, EB-PBF and BJT in this study.
In the study three HIP cycles with different temperature-pressure-curves are investigated. Low temperature treatments to preserve the specific as build microstructure as well as treatments above the -transus temperature are performed. The resulting material properties of LB-, EB-PBF and BJT specimen are analyzed in 20 different combinations of AM technology and HIP treatment. The study includes a detailed analysis of the density, microstructure and static as well as fatigue strength. AM specific material properties such as anisotropy are investigated.
Study results
Additionally, distortion and part deformation from densification and high temperature treatment in the HIP oven are evaluated on suitable test geometries. The overall economic impact of the HIP process on part cost and potential cost savings by porous, fast printing and post-process densification are analyzed.
The study on optimized HIP treatments for additive manufactured Ti-6Al-4V is currently ongoing and is scheduled to be completed in Q3 of 2020. The results will include a summary of the state of the art of additive manufactured Ti-6Al-4V, a detailed analysis and evaluation of optimized material properties after HIP treatment and an economical evaluation of high-speed printing in combination with post process densification.
AMPOWER Insights
A preview of the study results is published in AMPOWER Insights Vol. 7 Part 1: Material Performance Optimization – Increasing properties of Ti-6Al-4V parts by AM specific HIP treatments.
If you are interested in the full results of the study and all background information, get in contact with us today!
