About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Enhanced 900 °C-yield Strength in Inconel 738 Superalloys While Reducing Expensive Co Compositions |
Author(s) |
Hyo Ju Bae, Kwang Kyu Ko, Joong Eun Jung, Jung Gi Kim, Hyokyung Sung, Jae-Bok Seol |
On-Site Speaker (Planned) |
Hyo Ju Bae |
Abstract Scope |
Inconel 738 series are suitable for aircraft engines and gas-turbine plants for power generation because of their high-temperature capability > 940 °C. However, the high cost of the alloy remains one of the most challenging topics due to high amounts of expensive Co (8.00-9.00 wt%). Herein, with the aim of reducing the Co contents in bulk, the chemical composition and heat treatment routes of typical Inconel 738LC are modified while increasing the yield stress by 8.5%. Their mechanical properties significantly depended on the morphology and composition of constituent phases formed: Ni3(Al, Ti, Nb)-type precipitation(γ′) and MC-type carbides. Therefore, the microstructure of the modified Inconel 738LC was investigated with comparing that of typical Inconel 738LC. We discovered that, despite reducing Co contents 50 wt%, high-temperature compressive strength at 900 °C is improved with the increased fraction of γ′. Details of the property-microstructure relations will be explained. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, Other |