Effect of Pt-Al coating on low-cycle fatigue behavior in a Ni-based single crystal superalloy at 760 °C

被引：1
作者：
Wang, Di [1 ,2 ]
Wang, L. [1 ,2 ]
Li, K. W. [1 ,2 ]
Liu, J. [1 ,3 ]
Zhang, Y. J. [1 ,4 ]
Liu, X. G. [1 ,2 ]
Jiang, X. W. [1 ,2 ]
Zhang, G. [1 ,2 ]
Wang, D. [1 ]
Dong, J. . S. [1 ,2 ]
Zhang, J. [1 ]
Lou, L. H. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
[2] Liaoning High Temp Struct Mat Res Ctr Gas Turbine, Shenyang 110179, Peoples R China
[3] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[4] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 916卷
关键词：
Low-cycle fatigue behavior; Pt-Al coating; Ni-based single crystal superalloy; Cyclic stress response behavior; Fatigue life; Cyclic stress-strain; BRITTLE TRANSITION-TEMPERATURE; OXIDATION RESISTANCE; TENSILE PROPERTIES; ALUMINIDE; MICROSTRUCTURE; PREDICTION; MECHANICS; EXPOSURE; FRACTURE;
D O I：
10.1016/j.msea.2024.147311
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of Pt-Al coating on low-cycle fatigue behavior of Ni-based single crystal superalloy at 760 degrees C was evaluated. The results show that Pt-Al coating does not change the cyclic stress response behavior of the Ni-based single crystal superalloy at 760 degrees C. Under the total strain amplitude from 0.6 % to 1.2 %, the cyclic stress amplitude value of Pt-Al coating samples is slightly lower than uncoated samples during cyclic deformation at the stable stage under the same applied total strain amplitude, and the fatigue life of Pt-Al coating samples is lower than uncoated ones, with an average fatigue life reduction of about 19.9 %. By the relation curve of comparing the cyclic strain amplitude with the reversals to failure, it is observed that the fatigue ductility coefficient epsilon '(f) of the Pt-Al coating sample is higher than the uncoated sample, the fatigue ductility index c and fatigue strength coefficient sigma '(f) are lower than the uncoated sample, but the fatigue strength index b has little difference. It is found that the cyclic strength coefficient K ' and the cyclic strain hardening index n' of the Pt-Al coating sample are lower than the uncoated sample after fitting the curves of the relationship between cyclic stress amplitude and total strain amplitude. In addition, the cyclic stress amplitude of Pt-Al coating sample is slightly lower than uncoated sample under the same applied total strain amplitude. It was found by SEM that the cracks of both uncoated and Pt-Al coating samples initialized near the surface of the samples under low-cycle fatigue loading at 760 degrees C, and multiple crack sources began to spread into the substrate. It was found by TEM observation that at low strain amplitude (Delta epsilon(t)/2 = 0.6 %), the dislocations in both uncoated and Pt-Al coating samples mainly converged in gamma, and a large number of dislocation debris gathered in the gamma and dislocation entanglement was generated, while a small number of dislocations were observed to cut into gamma'. The gamma ' is seriously deformed and slightly rafted at Delta epsilon(t)/2 = 1.2 %, and a few dislocations are also observed in gamma'.
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页数：12
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