About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
|
Presentation Title |
Mechanical Strength and Fatigue Performance of Laser Powder Bed Fusion Processed Hydride-dehydride Ti-6Al-4V Powders |
Author(s) |
Mohammadreza Asherloo, Melody H Delpazir, Ziheng Wu, Muktesh Paliwal, Anthony D Rollett, Amir Mostafaei |
On-Site Speaker (Planned) |
Mohammadreza Asherloo |
Abstract Scope |
Hydride-dehydride (HDH) Ti-6Al-4V with non-spherical powder morphology is not widely used in laser powder bed fusion (L-PBF). The effect of non-spherical particles on powder flowability, packing density, and dynamics of laser-powder interaction should be considered to achieve near-fully dense, mechanically sound parts. HDH Ti-6Al-4V powder with size distribution of 50-120 μm is L-PBF processed and optimized processing parameters are used to fabricate cuboids and mechanical testing specimens with a density greater than 99.8 %. Hot isostatic pressing (HIP) is applied on as-built specimens to remove residual porosity. Microstructural observations and phase analyses show the formation of columnar β grains with acicular α/α’ phases in as-built condition, while the HIP results in partial decomposition of α’ to α+β inside the prior β grains. Results such as mechanical strength, hardness and fatigue life indicate that the cost-effective, non-spherical HDH powders used in this study are a viable raw material for use in the L-PBF process. |