About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Design of Decarburization after Application of Self-Terminating Dissolution to SS316L Processed by Laser Powder Bed Fusion |
Author(s) |
Soumya Sridar, Noah Sargent, Stephanie Prochaska, Mitra Shabani, Owen Hildreth, Wei Xiong |
On-Site Speaker (Planned) |
Soumya Sridar |
Abstract Scope |
Components fabricated using the laser powder bed fusion process require extensive post-processing to remove trapped powders, support structures, and surface roughness. Existing post-processing techniques, such as mechanical milling, cannot access the interior cavities. Dissolvable support technology, based on self-terminating dissolution process, has been developed for several materials to address these issues. In this work, self-terminating dissolution is applied to SS316L using sensitization at 800oC followed by etching. Using this process, the surface roughness of the as-printed part is reduced from 20 to 2 μm. This smoother surface is expected to improve mechanical performance and fluid flow. After etching, carbon accumulation was observed at the surface and decarburization heat treatment was designed using kinetic simulations performed with DICTRA. Using both simulation and experiments, the decarburization time and temperature were optimized using chemical and microstructural analysis. The mechanical properties were evaluated before and after the application of the decarburization by tensile testing. |