About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
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| Presentation Title |
Effect of Recrystallization on the Fatigue Properties of SS316L–Inconel 718 Bimetallic Medium-High Entropy Alloy Fabricated by Laser Powder Bed Fusion |
| Author(s) |
Liyi Wang, Xuanzhuo Nie, Mustafa Kaş, Wei Xiong |
| On-Site Speaker (Planned) |
Liyi Wang |
| Abstract Scope |
This work evaluates the influence of two typical heat treatment strategies on the microstructure and fatigue properties of a newly designed and cost-effective alloy composed of a mixture of SS316L and Inconel 718. The specimens were fabricated using laser powder bed fusion (LPBF). Two heat treatments with different solutionization temperature choices (HT1 at 1100°C, and HT2 at 1140°C) were designed to evaluate recrystallization impact on fatigue. The S-N curve fitted using Basquin’s equation indicates that the HT1 samples exhibit a longer average fatigue life than the HT2 samples. However, the fully recrystallized HT2 samples exhibit significantly lower variation in fatigue life. The defect microstructure suggests that the pronounced intrusions and extrusions at the sample corners of HT2 samples result from increased mobility of persistent slip bands in these less-constrained regions. This work demonstrates a design strategy for alloy feedstock development with heat treatment optimization for the time-dependent mechanical properties. |