About this Abstract |
Meeting |
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Symposium
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6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
Presentation Title |
An ICME Framework for Heat Treating Additively Manufactured Nitrogen Atomized 17-4PH Stainless Steel |
Author(s) |
James Zuback, Mark Stoudt, Daniel Gopman, Maureen Williams, Carelyn Campbell |
On-Site Speaker (Planned) |
James Zuback |
Abstract Scope |
The presence of nitrogen hinders the ability of additively manufactured 17-4PH stainless steel to form martensite during conventional post-process heat treatment. Here, an ICME approach is used to guide exploratory work for designing heat treatments with the goal of tailoring martensite fractions. Calphad based tools are used to reveal post-processing pathways for redistributing nitrogen in the form of precipitates and allowing the formation of martensite without cryogenic treatment. The calculated phase stabilities and transformation temperatures guide targeted heat treatment experiments, and post-processed materials are extensively characterized to provide validation and feedback for improving model predictions. Post-processing procedures are tested with multiple heats of nitrogen-atomized 17-4PH to identify necessary modifications to account for compositional variations. Findings suggest that although alternative heat treatment temperatures and times can be used to achieve desirable microstructure and properties, a universal protocol may not be suitable for all powder feedstock and additive manufacturing process combinations available. |
Proceedings Inclusion? |
Definite: Other |