Fatigue Properties of Additively Manufactured Ti-6Al-4V-ELI Material Hot Isostatically Pressed at Temperatures above the Material’s Beta Transus Temperature.

Hot Isostatic Pressing (HIP) is known to improve the fatigue performance of Ti-6Al-4V castings, and can result in a significant reduction in porosity. It is often used as a post-processing step in Additively Manufactured (AM) Ti-6Al-4V-ELI components and has been shown to significantly affect microstructure and heal internal porosity and other defects. The effects of various HIP temperatures on AM Ti-6Al-4V-ELI materials as it relates to the fatigue performance will be assessed. HIP exposures at various temperatures above the beta transus temperature will be examined and compared to results previously obtained on as-built and standard HIP processed samples. Axial fatigue results with full S-N curves will be presented from specimens of Electron Beam Manufactured (EBM) Ti-6Al-4V-ELI in the various HIPed conditions. Microstructural effects of these exposures will also be examined and documented. Fracture surfaces of the specimens will also be evaluated to contrast the samples’ fracture modes.