Fatigue crack propagation behavior of Ni-based superalloys after overloading at elevated temperatures

• Published in: Progress in natural science Vol. 26; no. 2; pp. 197 - 203
• Main Authors: Huang, Xinyue, Wang, Liang, Hu, Yunming, Guo, Guangping, Salmon, David, Li, Ying, Zhao, Wenxia
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2016; National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China%MTS Systems Corporation, Eden Prairie, MN 55344, USA%Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing Institute of Aeronautical Materials, Beijing 100095, China
• Subjects: closure;Superalloys; crack; Crack closure; Fatigue crack propagation rate; fatigue;Fatigue; High; High temperature fatigue; Overloading; propagation; rate;Overloading;Crack; Superalloys; temperature; Fatigue crack propagation rate; Overloading; High temperature fatigue; Superalloys; Crack closure; Superal oys
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2016.03.007

The fatigue crack propagation behavior of three superalloys subjected to a single overloading at elevated temperatures was investigated. The fatigue crack propagation rate FCPR versus stress intensity factor range data da/dN—ΔK were calculated using the two-point secant method. It was found that the crack growth rates of the investigated materials were retarded after overloading with an overload ratio R OL=1.6. The size of the plastic zone in the front of the crack tip and its relation to loading level were discussed. The overload retardation effects are attributed to crack closure. The fatigue damage in the plastic zone can also be a factor to explain the overload retardation.