About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Effect of Atomizing Gas on the Microstructure and Properties of Additively Manufactured 17-4 Precipitation Hardening Steel |
Author(s) |
Kaushalendra Singh, George Abott, Atieh Moridi |
On-Site Speaker (Planned) |
Kaushalendra Singh |
Abstract Scope |
The use of atomizing gas as a process parameter to tune the characteristics of manufactured parts during selective laser melting (SLM) printing has not been explored very well. In this work, we study the effect of using argon- and nitrogen-atomized powders on the microstructure and mechanical properties of 17-4 Precipitation Hardened (PH) stainless steel printed using SLM. The use of nitrogen as the atomizing gas results in the formation of powders with metastable austenitic phase and this austenitic phase is retained in the printed samples. Specimens printed with nitrogen atomized powders showed higher ductility and strength when compared to their argon atomized counterparts. Tensile tests in conjunction with electron backscattering diffraction (EBSD) have been used to study the deformation mechanism. We show that combined with post heat treatments, controlling the atomizing gas enables us to tailor the microstructure to achieve a wide range of strength-ductility values for a single composition. |