About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Effect of Microstructure and Surface Roughness on Fatigue Behavior of PBF-LB 316L Stainless Steel |
Author(s) |
Garrison Hommer, Jorge Ramirez Lujan, Simon Richardsen, Jonah Klemm-Toole, Joy Gockel |
On-Site Speaker (Planned) |
Jorge Ramirez Lujan |
Abstract Scope |
Understanding the effects of geometric defects and microstructure on the fatigue of 316L stainless steel manufactured by laser powder bed fusion (PBF-LB) additive manufacturing (AM) is critical for structural applications. Surface treatments are expensive, time consuming and not all printed surfaces are easily accessible after PBF-LB. However, surface features are often the dominating location of fatigue crack initiation. Prior studies investigating surface roughness effects consider only total fatigue life, which is influenced by both surface roughness and microstructure. Thus, the actual effect of surface roughness is convoluted with microstructural influence. Fatigue results will be presented where specimens were tested in both as-built and heat-treated microstructure conditions with as-printed surfaces. The influence of surface roughness and microstructure on decoupled fatigue crack initiation and growth is determined. An understanding of the separated influence of surface roughness and microstructure provides guidance towards parameter development, monitoring needs and qualification requirements for critical AM components. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, |