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10.3390/ma13235358
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Article

Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime

by
Mengxiong Zhao
1,2,*,
Zhenhua Zhao
1,
Lulu Liu
1,
Gang Luo
1 and
Wei Chen
1
1
Aero-Engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2
Laboratoire Energétique Mécanique Electromagnétisme, EA4416, Université Paris X Nanterre, 50 Rue de Sèvres, 92410 Ville d’Avray, France
*
Author to whom correspondence should be addressed.
Materials 2020, 13(23), 5358; https://doi.org/10.3390/ma13235358
Submission received: 22 October 2020 / Revised: 20 November 2020 / Accepted: 23 November 2020 / Published: 26 November 2020
(This article belongs to the Special Issue Study on Cyclic Mechanical Behaviors of Materials)
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Abstract

Cyclic response and fatigue behavior are sensitive to the microstructure of material induced by heat treatment. In this paper, three sets of high-temperature superalloy Inconel 718 with different heat treatment, namely annealed, aged, and directly aged high quality (DAHQ), are compared. Difference in grain size distribution, phase, and precipitate, etc., were investigated using an optical camera and scanning electron microscopy. Yield and ultimate strength were found to increase obviously after aging heat treatment. Self-heating phenomenon at 20 kHz was attenuated as grain size decreased. There was a transition from cyclic hardening to softening. Very-high cycle fatigue (VHCF) behavior of Inconel 718 was tested using an ultrasonic fatigue device. Crack initiation duration occupied greater than 99% of the total fatigue life. It concluded that average grain size influences VHCF strength and crack initiation mechanism, and that self-heating phenomenon is not a decisive factor on VHCF strength for Inconel 718.
Keywords: heat treatment; microstructure; very high cycle fatigue; ultrasonic; Inconel 718; self-heating heat treatment; microstructure; very high cycle fatigue; ultrasonic; Inconel 718; self-heating

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MDPI and ACS Style

Zhao, M.; Zhao, Z.; Liu, L.; Luo, G.; Chen, W. Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime. Materials 2020, 13, 5358. https://doi.org/10.3390/ma13235358

AMA Style

Zhao M, Zhao Z, Liu L, Luo G, Chen W. Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime. Materials. 2020; 13(23):5358. https://doi.org/10.3390/ma13235358

Chicago/Turabian Style

Zhao, Mengxiong, Zhenhua Zhao, Lulu Liu, Gang Luo, and Wei Chen. 2020. "Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime" Materials 13, no. 23: 5358. https://doi.org/10.3390/ma13235358

APA Style

Zhao, M., Zhao, Z., Liu, L., Luo, G., & Chen, W. (2020). Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime. Materials, 13(23), 5358. https://doi.org/10.3390/ma13235358

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