About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Effect of Laser Polishing on Fatigue Behavior of Additively Manufactured IN718 |
Author(s) |
Seungjong Lee, Martin Bureš, Shuai Shao, Douglas Wells, Miroslav Zetek, Miloslav Kepka, Nima Shamsaei |
On-Site Speaker (Planned) |
Seungjong Lee |
Abstract Scope |
This study investigates the effect of laser polishing on the fatigue behavior of IN718 fabricated using laser powder bed fusion process. Four different conditions including as-built, laser-polished using two different process parameters, and laser-polishing followed by secondary stress relief are considered. Uniaxial tension-compression fatigue tests are conducted in strain-controlled mode to examine the fatigue behavior for each condition. In addition, surface roughness measurements, microstructure analysis, and porosity measurements are also performed for all conditions. The results indicate that laser-polishing alone does not improve fatigue performance, even though it can significantly reduce surface roughness. The beneficial effects of the smoother surfaces may have been countered by the tensile residual stresses induced by laser-polishing. It is also observed that while the secondary stress relief reduces tensile residual stresses, it dissolves the precipitates and weakens the material, and therefore, fatigue behavior is not improved. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |