Rishi Khanna
Independent Researcher
India
Abstract
Nickel-based superalloys are critical materials for high-performance turbine components due to their excellent mechanical strength and resistance to high-temperature oxidation and creep. Thermo-mechanical fatigue (TMF), characterized by cyclic mechanical loading combined with temperature variations, is a major cause of failure in turbine blades and disks. This study investigates the TMF behavior of a typical nickel-based superalloy used in turbine applications under controlled laboratory conditions, simulating in-service thermal and mechanical cycles. A comprehensive experimental methodology combined with finite element simulation was employed to analyze fatigue life, microstructural evolution, and damage mechanisms. Statistical analysis of fatigue life data provided insights into the material’s durability under varying stress and temperature amplitudes. The results demonstrate the influence of temperature gradients and mechanical strain amplitudes on crack initiation and propagation. The study highlights the importance of TMF-resistant alloy design and processing for extending turbine component life and improving safety and efficiency in aero-engine and power generation applications.
Keywords Thermo-mechanical fatigue, nickel-based superalloys, turbine blades, fatigue life, microstructure, finite element simulation.
References
- Bye, K. et al., “Thermo-mechanical fatigue behavior of nickel-based superalloys,” Materials Science and Engineering A, vol. 560, pp. 1-12, 2012.
- Evans, A.G., “Mechanisms of fatigue crack growth in nickel-based superalloys,” International Journal of Fatigue, vol. 88, pp. 159-167, 2016.
- Radhakrishnan, B. et al., “Experimental study of TMF in INCONEL 718,” Journal of Engineering Materials and Technology, vol. 140, no. 3, 2018.
- Lee, J.H. et al., “Microstructural evolution during thermo-mechanical fatigue,” Metallurgical and Materials Transactions A, vol. 48, pp. 3652-3664, 2017.
- Zhang, T., Li, S., “Finite element modeling of TMF in turbine materials,” Computational Materials Science, vol. 102, pp. 250-259, 2015.
- Ghosh, A.K. et al., “Constitutive modeling of nickel-based superalloys at elevated temperature,” Mechanics of Materials, vol. 129, pp. 43-58, 2019.
