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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
Presentation Title Revealing the Complex Relationships Between Composition and Phase Transformation Route Under 17-4 PH Stainless Steel Through In Situ High Speed XRD of Custom Manufactured Compositions
Author(s) Michael Haines, Andrew Chuang, Sophie Primig, Fan Zhang
On-Site Speaker (Planned) Michael Haines
Abstract Scope Under additive manufacturing, the understanding of complex phase transformation routes of stainless steels, influenced by composition and processing conditions, is a necessity for greater adoption in industry. 17-4 precipitate hardened (PH) stainless steel has faced challenges towards producing consistent microstructures due to its sensitivity towards processing conditions and alloy composition. Final as-built microstructures for this alloy have shown complex combinations of δ-ferrite, austenite, and/or martensite at different phase fraction and morphologies. This work uncovers the complex relations between composition and phase transformation route in 17-4 PH through targeted custom compositional developments and in-situ high-speed x-ray diffraction that is able to reveal the phase transformation route from melt to room temperature. This work is further supplemented by advanced characterization techniques. Results reveal a rapid massive-like transformation occurring from delta ferrite to austenite that will be essential to control in order to obtain the required fully martensitic microstructure at room temperature.
Proceedings Inclusion? Planned:
Keywords Phase Transformations, Additive Manufacturing, Characterization

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