Title: Surface Roughness and Hardness Dependence on Heat Treatment and Geometry of Additively Manufactured Precipitation Hardened 17% Chromium – 4% Nickel Stainless Steel
Authors: Maddy Selby, Julianna Posey, Michael Duffy, Caroline Vail, Marc Zupan
Abstract: Additive manufacturing (AM) is targeted to be a viable manufacturing process to create precipitation hardened (PH) stainless steel alloys for next-generation vehicle systems due to their high strength and corrosion resistance. The mechanical and physical properties of PH stainless steel alloys are dependent on heat treatments, specifically when dealing with additively manufactured components. In this work, variation in mechanical and physical properties due to heat treatments and building geometry on powder bed fusion (PBF) AM 17% Chromium – 4% Nickel (17-4 PH) alloy structures are evaluated. Two builds under different conditions were studied: one as-built without post-processing heat treatment; and the other undergoing three thermal processing stages (stress-relief, solution treatment, and aging). On each build, surface roughness and hardness were analyzed on thin fin structures, classified by thickness and build angle, along with zig zag structures of varying dimensions. Roughness measurements will be presented from upskin and downskin surfaces of each component, defined by varying build angles and cross-sectional areas. Vickers hardness testing is used across the thin fin structures. The role that heat treatment and geometry play on the measured properties will be detailed. Testing showed that roughness and hardness values increase with a decrease in build angle.
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Conference: SAMPE NEXUS 2021
Publication Date: 2021/06/29
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