Vaasudevan, A;
León-Cázares, FD;
Fischer, E;
Witulski, T;
Rae, C;
Galindo-Nava, E;
(2023)
Towards Enhancing Hot Tooling to Form High-γ′ Superalloys.
In:
TMS Annual Meeting & Exhibition TMS 2023: Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives.
(pp. pp. 65-91).
Springer Nature Switzerland
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Abstract
Ni-superalloys are well-established for use in high temperature applications in aerospace, power generation, and automotive sectors, yet, are seldom considered as materials for hot tooling. The operational conditions of hot forming dies potentially exceed those experienced by aircraft turbine discs. Fortunately, new disc alloys have pronounced elevated temperature capabilities and the current study focuses on implementing two advanced alloys, VDM 780 and Haynes 282 (H282) as hot tool materials. There is, however, inadequate evidence of their life-limiting properties and mechanisms in the in-service temperature regime of 700–900 ºC. Thus, realistic operating conditions were replicated by combining interrupted short and long-term thermal-mechanical tests. Initially, isothermal ageing in the furnace was used to compare the extent of γ′ coarsening between the alloys, and subsequent in-situ ageing and compression testing measured the accompanying loss in strength. Compression creep testing at stresses near the yield points (250–750 MPa) revealed accelerated creep rates at high temperatures. The results indicated that even as exposure duration, temperature, and applied stress all influence microstructural evolution, the exposure temperature was pivotal in determining the effective life of these γ′ strengthened alloys. Dissolution kinetics of γ′ around near-solvus temperatures was crucial and was governed by elemental additions. As a result, the research paves the way for a better understanding and design of superalloys with improved thermal integrity for hot tooling.
| Type: | Proceedings paper |
|---|---|
| Title: | Towards Enhancing Hot Tooling to Form High-γ′ Superalloys |
| Event: | TMS 2023 - 10th International Symposium on Superalloy 718 and Derivatives |
| ISBN-13: | 9783031274466 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/978-3-031-27447-3_5 |
| Publisher version: | http://dx.doi.org/10.1007/978-3-031-27447-3_5 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | VDM 780, H282, Superalloys, Hot tooling, Gamma prime, Thermal stability, Creep testing, Microstructure, Delta, Carbides, Turbine discs, Hot forging |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10188041 |
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