About this Abstract |
Meeting |
MS&T21: 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 |
Microstructure Development of Additively Manufactured Gamma Prime Strengthened Ni-based Superalloy Rene65 |
Author(s) |
Colleen Hilla, Andrew Wessman, Alber Sadek, Hyeyun Song, Wei Zhang, Michael Mills |
On-Site Speaker (Planned) |
Colleen Hilla |
Abstract Scope |
Grain and precipitate structure, influenced by location specific thermal history during AM, have important effects on mechanical behavior. This study aims to understand the role that spot size plays in microstructure development and subsequent mechanical behavior of Rene65, a γ’ strengthened Ni-based superalloy. Segregation across the melt pool, and melt pool characteristics, were analyzed on single-track samples using EDS and optical analysis. The effect of overlap of adjacent passes on a single build layer and the effect of thermal cycling due to subsequent build layers were analyzed on overlapping tracks and small builds using SEM and EBSD. As-built microstructures were altered using various heat treatment schedules. The effect of these microstructural changes on tensile strength and creep behavior was tested. Changes in spot size and heat treatment schedule lead to variations in the segregation profile, texture development, and mechanical behavior due to changes in thermal history validated through thermal modeling. |