Influence of microstructures on thermal fatigue property of a nickel-base superalloy

doi:10.1007/s11706-015-0277-9

Front. Mater. Sci.

2015, Vol. 9

Issue (1) : 85-92 https://doi.org/10.1007/s11706-015-0277-9

RESEARCH ARTICLE

Influence of microstructures on thermal fatigue property of a nickel-base superalloy

Peng-Cheng XIA^1,^2,^*(

),Feng-Wen CHEN¹,Kun XIE¹,Ling QIAO¹,Jin-Jiang YU²

1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Effect of microstructures such as the distribution and shape of carbide and γ′ phase on thermal fatigue property of a superalloy was investigated experimentally. The resistance of thermal fatigue of the studied alloy decreases with the rising upper temperature. For the as-cast alloy, the thermal fatigue crack mostly origins from carbide at low upper temperature and results from oxidation at high upper temperature. The thermal fatigue crack of the heat treated alloy is mainly initiated by the oxidized cavity and then propagates through the join of the oxidized cavity. The orientation of crack propagation and direction of dendrite growth of alloy have the angle of 45°. There is γ′ denuded region near the thermal fatigue crack because of oxidation.

Keywords nickel-base superalloy thermal fatigue microstructure crack

Corresponding Author(s): Peng-Cheng XIA

Online First Date: 21 January 2015 Issue Date: 02 March 2015

Cite this article:

Jin-Jiang YU,Peng-Cheng XIA,Feng-Wen CHEN, et al. Influence of microstructures on thermal fatigue property of a nickel-base superalloy[J]. Front. Mater. Sci., 2015, 9(1): 85-92.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0277-9
https://academic.hep.com.cn/foms/EN/Y2015/V9/I1/85

Fig.1 Schematic diagram of the thermal fatigue specimen of alloy (unit: mm).

Fig.2 The carbide morphology of (a) AS alloy and (b) HT alloy.

Fig.3 The γ′ precipitate of (a) AS alloy and (b) HT alloy.

Tab.1 Initiation cycles of thermal fatigue crack at different upper temperatures

Fig.4 Crack initiation of alloy at upper temperature of 1000°C: (a) thermal fatigue cracks of AS alloy; (b) crack initiation of AS alloy by carbide; (c) thermal fatigue cracks of HT alloy; (d) crack initiation of HT alloy by oxidation. (e) EDS result corresponding to the region of crack tip indicated by the arrow in (d).

Fig.5 Crack initiation of AS alloy at upper temperature of 1100°C: (a) thermal fatigue cracks; (b) oxide and holes near crack.

Fig.6 Kinetics curves of crack propagation of thermal fatigue at different upper temperatures.

Tab.2 Crack length of thermal fatigue after 150 cycles at different upper temperatures

Fig.7 Crack propagation of thermal fatigue with different upper temperatures after 150 cycles: (a) thermal fatigue crack of AS alloy at 1000°C; (b) thermal fatigue crack of HT alloy at 1050°C; (c) thermal fatigue crack of AS alloy at 1100°C; (d) oxidized cavity of AS alloy at 1100°C.

Fig.8 The γ′ denuded region during thermal fatigue test: (a) HT alloy at the upper temperature of 1050°C; (b) AS alloy at the upper temperature of 1000°C. (c) Line scanning corresponding to the γ′ denuded region in AS alloy.

Tab.1

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