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Meeting

2026 TMS Annual Meeting & Exhibition

Symposium

Late News Poster Session

Presentation Title

F-66: Scan-Path-Induced In-Situ Heat Treatment Effects on Austenite Stability and DIMT in PBF-Fabricated Thin Wall Structure

Author(s)

Seungho Lee, Du-Rim Eo, Jongcheon Yoon, Yong Son, Jin-Kyung Kim, Kyunsuk Choi, Dong-seok Kang

On-Site Speaker (Planned)

Seungho Lee

Abstract Scope

This study examines the influence of laser scan pattern and powder chemistry on the microstructural evolution and mechanical behavior of 17-4PH stainless steel fabricated by laser powder bed fusion (PBF), with emphasis on thin-walled geometries where thermal history is highly sensitive. Variations in in-situ heat treatment (IHT) arising from longitudinal and transverse scanning, together with changes in Cr/Ni equivalent ratio, were investigated. EBSD, XRD, TEM, and lattice parameter analysis, combined with FEM thermal simulations, revealed that the transverse scan strategy produced deeper melt pools and stronger IHT conditions compared to longitudinal scans. Enhanced thermal exposure in the transverse case promoted carbon partitioning, thereby stabilizing retained austenite more effectively. This stabilization delayed deformation-induced martensitic transformation (DIMT), resulting in improved strain hardening and ductility. These results demonstrate that scan-path design, through its impact on IHT, is a key process variable for tailoring microstructure and performance of PBF-fabricated martensitic stainless steels. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (RS-2025-00561853). This work was also supported by the Korea Institute of Industrial Technology (KITECH) as an internal project (UR260010).

Proceedings Inclusion?

Undecided

Keywords

Additive Manufacturing, Iron and Steel, Phase Transformations

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