Title: Direct Tension and Fatigue Characterization of AM Ti-6Al-4V Defects: A Microsample Approach

Authors: Joao Santos, Kourtney Rutkowski, Marc Zupan, Michael Duffy, Steven Storck

DOI: 10.33599/nasampe/s.21.0480

Abstract: Additive Manufacturing (AM) has the potential to improve readiness and increase the speed of aircraft components to the fleet with on-demand part production. As fatigue-critical applications, the lack of understanding of the AM process-structure-property relationship limits AM parts' widespread use and presents challenges for certification. It is essential to investigate the relationship between manufacturing process parameters, the resulting defects, and the defect dependent mechanical performance of these materials, to understand the impact of manufacturing and defects formation on structural performance. In this study, Direct Metal Laser Sintering AM Ti-6Al-4V is mechanically tested using MicroTensile and MicroFatigue testing techniques. By varying the processing parameters away from standard processing levels, defects are intentionally induced, creating both keyhole and lack-of-fusion type defects. The effect of defect type, size, and shape, porosity, and as-built material microstructure on mechanical performance is discussed. Results show that not only porosity is essential, but the type of defect is critical to material mechanical performance.

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Conference: SAMPE NEXUS 2021

Publication Date: 2021/06/29

SKU: TP21-0000000480

Pages: 17

Price: FREE