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Materials 2015, 8(9), 6179-6194; doi:10.3390/ma8095299

Effect of Heat Treatment Process on Microstructure and Fatigue Behavior of a Nickel-Base Superalloy

1
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
2
Central Iron & Steel Research Institute, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Lancaster
Received: 23 August 2015 / Revised: 9 September 2015 / Accepted: 10 September 2015 / Published: 16 September 2015
(This article belongs to the Special Issue Failure Analysis in Materials)
View Full-Text   |   Download PDF [7478 KB, uploaded 16 September 2015]   |  

Abstract

The study of fatigue behaviors for nickel-base superalloys is very significant because fatigue damage results in serious consequences. In this paper, two kinds of heat treatment procedures (Pro.I and Pro.II) were taken to investigate the effect of heat treatment on microstructures and fatigue behaviors of a nickel-base superalloy. Fatigue behaviors were studied through total strain controlled mode at 650 °C. Manson-Coffin relationship and three-parameter power function were used to predict fatigue life. A good link between the cyclic/fatigue behavior and microscopic studies was established. The cyclic deformation mechanism and fatigue mechanism were discussed. The results show that the fatigue resistance significantly drops with the increase of total strain amplitudes. Manson-Coffin relationship can well predict the fatigue life for total strain amplitude from 0.5% to 0.8%. The fatigue resistance is related with heat treatment procedures. The fatigue resistance performance of Pro.I is better than that of Pro.II. The cyclic stress response behaviors are closely related to the changes of the strain amplitudes. The peak stress of the alloy gradually increases with the increase of total strain amplitudes. The main fracture mechanism is inhomogeneous deformation and the different interactions between dislocations and γ′ precipitates. View Full-Text
Keywords: heat treatment; microstructure; fatigue behavior; fatigue life model; fracture mechanism heat treatment; microstructure; fatigue behavior; fatigue life model; fracture mechanism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, P.; Zhu, Q.; Chen, G.; Qin, H.; Wang, C. Effect of Heat Treatment Process on Microstructure and Fatigue Behavior of a Nickel-Base Superalloy. Materials 2015, 8, 6179-6194.

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