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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing: Alloy Design to Develop New Feedstock Materials III
Presentation Title Grain Boundary Engineering of 316L Stainless Steel via Laser Powder Bed Fusion
Author(s) Matteo Seita, Shubo Gao
On-Site Speaker (Planned) Matteo Seita
Abstract Scope Applying conventional grain boundary engineering (GBE) to parts produced using near-net-shape manufacturing processes—including additive manufacturing (AM)—is challenging due to the copious mechanical strain involved. In this study, we present an alternative route to GBE of as-built AM alloys which requires no mechanical deformation. Focusing on laser powder bed fusion of 316L stainless steel, we find that the propensity of the alloy to recrystallize mainly depends on the solidification microstructure—including the cell size and the amount of solute that decorates their interfaces—which may be controlled by tuning the process parameters. By choosing the proper laser scanning strategy, we demonstrate the capability of triggering recrystallisation site-specifically and produce “microstructure architectures” consisting of controlled grain boundary character distributions. The resulting alloys exhibit non-conventional mechanical properties and showcase the additional opportunity offered by AM to design superior materials with complex microstructures.
Proceedings Inclusion? Undecided


A High-throughput Method to Define New Feedstock Process Parameters in Additive Manufacturing
Additive Manufacturing Feasibility Investigation Using Single Track Study for the Fabrication of Borated Austenitic Stainless Steels via Laser Powder Bed Fusion
Development of Al-Ce Alloys for Additive Manufacturing Using the CALPHAD Method
Grain Boundary Engineering of 316L Stainless Steel via Laser Powder Bed Fusion
Insights into Additive Manufacturability and Microstructure Evolution from Simple Analytical Models
Solidification Cracking in Binary Al-Cu Alloys (1.5, 3.0, 4.5, 6.0, and 10 wt.% Cu) Additively Manufactured by Laser Powder Bed Fusion
Spherical Micro/Macro Indentation Stress-strain Curves for Additive Manufacturing Materials Design

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