About this Abstract |
Meeting |
Materials Science & Technology 2020
|
Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
Presentation Title |
Effect of Atomization and Processing Gas on Microstructures in Additively Manufactured 17-4PH Stainless Steel |
Author(s) |
Alexis Ernst, Rainer J. Hebert, Mark Aindow |
On-Site Speaker (Planned) |
Alexis Ernst |
Abstract Scope |
Powder bed fusion (PBF) techniques have the capability to produce complex near-net shaped components from a variety of different powders. For PBF of stainless steels it was suggested that the atomization gas and/or the background gas in the build chamber could have an important influence on the phase composition and microstructure in the as-built material. Since nitrogen is known to stabilize austenite, the use of nitrogen as the atomization gas or as the processing gas could affect the balance of the ferrite (⍺) and austenite (ɣ) phases. Here, we have built 17-4PH samples under identical conditions except for the use of N2 and Ar gas during the build process and we used commercial N2 and Ar gas-atomized powders. The effects of the gas on the microstructure, phase composition and final N2 contents have been assessed and the consequences of these observations can be a design variable in PBF of 17-4PH. |