|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Advanced Manufacturing
||PAN-13: Microhardness Assessment of 316L Stainless Steel Fabricated by Laser Engineered Net Shaping
||Katherine Acord, Thale Smith, Julie Schoenung
|On-Site Speaker (Planned)
Laser Engineered Net Shaping (LENS®) is a direct energy deposition processing technique that enables the formation of fine microstructures due to rapid solidification leading to improved strength and hardness; however, directional solidification results in locally varying thermal history that alters mechanical properties. The goals of this study are: to assess the role of feedstock powder characteristics on solidification structure and mechanical properties, and to determine the potential for inhomogeneous mechanical behavior due to the thermal effect of LENSŪ processing. Two 316L austenitic stainless steel powders produced by gas atomization (GA) and water atomization (WA) were utilized. Microindentation hardness testing was conducted using a geometric array in order to systematically evaluate the position-dependent mechanical properties. Findings elucidate the role of feedstock powder in controlling final properties of LENS® builds, while presenting a novel approach to thermal behavior assessment that accounts for the statistical significance of microhardness measurements.
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