| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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| Presentation Title |
Effects Combined Homogenization and Cryogenic Treatment on the Microstructure and Mechanical Properties of 17-4 PH Stainless Steel Fabricated by Laser-Powder Bed Fusion |
| Author(s) |
Hyun-Hak Kang, Seung-Chang Han, Si-Mo Yeon, Vladimir Luzin, Tea-Sung Jun |
| On-Site Speaker (Planned) |
Hyun-Hak Kang |
| Abstract Scope |
Additive manufacturing (AM) enables the fabrication of complex geometries and provides great design flexibility. The microstructural heterogeneity is induced by the thermal gradient during the AM process. Post-heat treatment is utilized to alleviate the disadvantages of the AM microstructure. Meanwhile, deep cryogenic treatment (DCT) induced lattice strain and second phase transformation of specific steel alloys, which would enhance the subsequent precipitation hardening.
In this study, a novel post-processing strategy that synergistically combines homogenization and DCT is investigated to reduce microstructural inhomogeneities and improve the mechanical properties of L-PBF processed 17-4 PH stainless steel. The hardness (560 Hv) and tensile strength (1.5 GPa) were dramatically increased in the DCT sample compared to the conventionally heat-treated samples. DCT-induced residual stress and lattice distortion were analyzed by neutron diffraction and HR-EBSD. Cu-rich nano-precipitates were characterized by TEM. The superior properties of the DCT sample are attributed to precipitation strengthening and dislocation repulsion mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Characterization |