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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
Presentation Title Microstructure Evolution According to Heat Treatment Design of Alloy 625 Produced by Selective Laser Melting
Author(s) Tae-Hun Kim, Jung Min Han, Hyun-Uk Hong
On-Site Speaker (Planned) Tae-Hun Kim
Abstract Scope This study focused on the microstructure evolution of Alloy 625 produced by selective laser melting (SLM) with different heat treatment designs. Heat treatments used in this study were RX for recrystallization and GBS for grain boundary serration. These were compared with As-built and Conventional Wrought Alloy 625 to evaluate the microstructure stability and mechanical properties. After heat treatments, mechanical properties and microstructure stability were improved than As-Built with fully recrystallized microstructures. Fracture behaviors of RX and GBS after tensile tests exhibited similar and the crack initiated at grain boundaries with precipitates. But GBS showed higher resistance to grain boundary cracking than RX. And the formation of mechanical twins was restricted due to nano-sized oxides whilst Wrought showed a high density of twins which led to higher ductility at 700 ℃. The high-temperature tensile properties of SLMed Alloy 625 with heat treatments, were discussed in terms of the unique deformation mechanisms.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, High-Temperature Materials, Mechanical Properties


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Long-term Process Stability in Laser Powder Bed Fusion
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