Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties: Poster Session
Program Organizers: Ulf Ackelid, Freemelt AB; Ola Harrysson, North Carolina State University
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
A-16: Characteristics of Ti-6Al-4V Component Fabricated by Laser Powder Bed Fusion Process: Youngil Son1; Seok-Jae Lee2; 1Advanced Propulsion Technology Center, Agency for Defense Development; 2Jeonbuk National University
We investigated the characteristics of Ti-6Al-4V component fabricated by laser powder bed fusion(L-PBF) process. The characteristics including macrostructure, microstructure, and mechanical properties were evaluated quantitatively. The Ti-6Al-4V component fabricated by L-PBF showed a relative density which was identical to that measured by the Ti-6Al-4V sample prepared by traditional processes. There was a little difference in surface roughness of the Ti-6Al-4V component manufactured by L-PBF depending on the initial average size of Ti-6Al-4V powder particles. The lamellar structure was repeatdely observed in the Ti-6Al-4V component fabricated by L-PBF. The complex microstructure consisted of α-phase and β-phase was observed in the Ti-6Al-4V sample prepared by traditional processes whereas the α’-martensite was only observed in the Ti-6Al-4V sample manufactured by L-PBF. The Ti-6Al-4V component fabricated by L-PBF showed higher yield and tensile strength, higher hardness, and better elongation compared with the Ti-6Al-4V sample prepared by traditional processes.
A-17: Linking Processing Conditions to Defect Structures, Microstructure, and Mechanical Behavior in Ti-6Al-4V Fabricated by Laser Powder Bed Fusion: Qixiang Luo1; Allison Beese1; 1Pennsylvania State University
In this study, the relationships among processing parameters, microstructures, and mechanical properties by Ti-6Al-4V fabricated via laser powder bed fusion were investigated. In particular, our aim was to determine how defect structures, prior-beta grain characteristics, and mechanical properties varied over a wide range of laser power and scanning speed. Thus, samples were fabricated using 42 disparate processing parameter sets, probing dense, lack-of-fusion, keyhole, and beading-up regimes, and samples were characterized using X-ray computed tomography, optical metallography, uniaxial tension, and Vickers microhardness measurements. Linkages among processing, microstructure/defects, and property characteristics were determined using statistical bivariate correlation analysis. Process defect maps and process property maps will be presented for tuning processing to achieve desired properties in additively manufactured Ti-6Al-4V.