About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-31: Influence of Alloy Composition on Cell Formation in Additively Manufactured Stainless Steels |
Author(s) |
Joseph W. Aroh, Seunghee Oh, Rachel Lim, Chihpin Andrew Chuang, Niranjan Parab, Cang Zhao, Tao Sun, P. Christopher Pistorius, Anthony D. Rollett |
On-Site Speaker (Planned) |
Joseph W. Aroh |
Abstract Scope |
Metal additive manufacturing introduces rapid solidification resulting in nonequilibrium microstructures. The as-built microstructure in 316L stainless steel consists of submicron cellular structures that improve both strength and ductility over conventional material. Characterization of AM 316L repeatedly shows higher Cr and Mo concentrations at the cell boundaries. To understand the effect of alloy composition and micro-segregation, we produced three Fe-Ni-Cr ternary alloys with different amounts of Cr and Ni with the intent of varying the balance between ferrite and austenite. In-situ high-speed synchrotron x-ray diffraction experiments were carried out on each alloy at the Advanced Photon Source under conditions representative of laser-based AM processes. We discuss the effect of composition and cooling rate on undercooling, segregation, and phase selection at the cellular length scale in Fe-Ni-Cr alloys. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |