About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Surface Engineering V
|
Presentation Title |
Fatigue Behavior of Laser Polished Laser Powder Bed Fused IN718: Identify a Suitable Heat Treatments and Laser Polishing Combination |
Author(s) |
Seungjong Lee, Martin Bureš, Shuai Shao, Douglas Wells, Miroslav Zetek, Nima Shamsaei |
On-Site Speaker (Planned) |
Seungjong Lee |
Abstract Scope |
Laser polishing (LP), a remelting-based post surface treatment technique, can significantly reduce surface roughness and near-surface defects of additively manufactured parts. The associated fast solidification, however, introduces inevitable tensile residual stresses detrimental to the fatigue performance of the processed parts, which require further heat treatment (HT) to remove. This study inserts LP after different steps of a full HT schedule (i.e., stress-relief, hot isostatic pressing (HIP), and solution-annealing + aging), examines the resulting fatigue behavior of laser powder bed fused IN718 specimens, and attempts to identify a suitable HT and LP combination. Uniaxial, fully-reversed fatigue tests were conducted in strain-controlled mode. Surface measurements, microstructure characterizations, and porosity measurements were performed for all conditions to explain the differences in fatigue lives. The preliminary results show that performing LP before HIP could eliminate any subsurface defects introduced by LP, restore surface material strength, and is expected to yield the best fatigue resistance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Surface Modification and Coatings, Mechanical Properties |