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  Thermal cycling creep properties of a directionally solidified superalloy DZ125

An, W., Utada, S., Guo, X., Antonov, S., Zheng, W., Cormier, J., et al. (2022). Thermal cycling creep properties of a directionally solidified superalloy DZ125. Journal of Materials Science & Technology, 104, 269-284. doi:10.1016/j.jmst.2021.07.015.

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 Creators:
An, Wenrui1, Author
Utada, Satoshi2, Author              
Guo, Xiaotong3, Author
Antonov, Stoichko4, Author              
Zheng, Weiwei1, Author
Cormier, Jonathan5, Author              
Feng, Qiang1, Author
Affiliations:
1Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China, ou_persistent22              
2Institut Pprime, UPR CNRS 3346, Physics and Mechanics of Materials Department, ISAE-ENSMA, BP 40109, Futuroscope-Chasseneuil Cedex, France, ou_persistent22              
3China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 510610, China, ou_persistent22              
4Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
5Institut Pprime, Physics and Mechanics of Materials Department, UPR CNRS 3346, ISAE-ENSMA, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope-, Chasseneuil, France, ou_persistent22              

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Free keywords: Aircraft engines; Carbides; Grain boundaries; Isotherms; Superalloys; Thermal cycling; Turbine components; Turbomachine blades, Aero-engine turbines; Component design; Directionally solidified superalloy; Interfacial dislocation networks; Mechanical degradation; Micro-structural; Microstructural degradation; Minimum creep rates, Creep
 Abstract: Aero-engine turbine blades may suffer overheating during service, which can result in severe microstructural and mechanical degradation within tens of seconds. In this study, the thermal cycling creep under (950°C/15 min+1100°C/1 min)-100 MPa was performed on a directionally solidified superalloy, DZ125. The effects of overheating and thermal cycling on the creep properties were evaluated in terms of creep behavior and microstructural evolution against isothermally crept specimens under 950°C/100 MPa, 950°C/270 MPa, and 1100°C/100 MPa. The results indicated that the thermal cycling creep life was reduced dramatically compared to the isothermal creep under 950°C/100 MPa. The plastic creep deformation mainly occurred during the overheating stage during the thermal cycling creep. The thermal cycling creep curve exhibited three stages, similar to the 1100°C isothermal creep, but its minimum creep rate occurred at a lower creep strain. The overheating events caused severe microstructural degradation, such as substantial dissolution of γ' phase, earlier formation of rafted γ' microstructure, widening of the γ channels, and instability of the interfacial dislocation networks. This microstructural degradation was the main reason for the dramatic decrease in thermal cycling creep life, as the thermal cycling promoted more dislocations to cut into γ' phase and more cracks to initiate at grain boundaries, carbides, and residual eutectic pools. This study underlines the importance of evaluating the thermal cycling creep properties of superalloys to be used as turbine blades and provides insights into the effect of thermal cycling on directionally solidified superalloys for component design. © 2021

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Language(s): eng - English
 Dates: 2022-03-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmst.2021.07.015
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Title: Journal of Materials Science & Technology
  Other : J. Mater. Sci. Technol.
Source Genre: Journal
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Publ. Info: Shenyang, China : Editorial Board of Journal of Materials Science and Technology
Pages: - Volume / Issue: 104 Sequence Number: - Start / End Page: 269 - 284 Identifier: ISSN: 1005-0302
CoNE: https://pure.mpg.de/cone/journals/resource/954925584235