About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Effects of Process Conditions and Flaws/Surface Roughness on Fracture and Fatigue of AM-processed Alloys |
Author(s) |
John J. Lewandowski |
On-Site Speaker (Planned) |
John J. Lewandowski |
Abstract Scope |
It is desirable to use various AM techniques to fabricate replacement parts that are flight critical. In order to continue to gain confidence in AM, it remains important to understand the effects of rogue flaws/surface roughness on properties. The performance of nominal (defect-free) material with machined surfaces is being compared to material with readily detectable surface/sub-surface flaws as well as to material with difficult to detect flaws and/or surface roughness. Ongoing research with collaborators is investigating the effects of purposely introduced defects (e.g. LoF, Keyhole, etc.) on mechanical properties by systematically varying process parameters, including surface roughness. Samples have been fabricated with selective placement of flaws of various types and sizes in addition to nominally defect-free material and tested in either machined or as-deposited conditions. The fracture and fatigue behavior will be reviewed along with quantification of fracture surface details in the context of a defect-based Kitagawa-Murakami-type approach. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Other |