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Communication

Effect of Overheating Temperature on Thermal Cycling Creep Properties of K465 Superalloy

1
Chongqing CEPREI Industrial Technology Research Institute Co., Ltd., Chongqing 401332, China
2
China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 511370, China
3
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Yanhui Chen, Yunsong Zhao and Bolv Xiao
Crystals 2021, 11(12), 1458; https://doi.org/10.3390/cryst11121458
Received: 5 November 2021 / Revised: 18 November 2021 / Accepted: 23 November 2021 / Published: 25 November 2021
Turbine blades in aircraft engines may encounter overheating and suffer serious creep property degradation. In this study, the thermal cycling creep experiments were conducted on K465 superalloy under (900 °C/30 min–1100 °C/3 min)/50 MPa, (900 °C/30 min–1150 °C/3 min)/50 MPa and (1000 °C/30 min–1150 °C/3 min)/50 MPa. The investigated thermal cycling creep properties were dramatically degraded, and increasing the overheating temperatures significantly decreased the thermal cycling creep life. The secondary γ′ precipitates obviously dissolved and the area fraction decreased to around 35.2% under (900 °C/30 min–1150 °C/3 min)/50 MPa and (1000 °C/30 min–1150 °C/3 min)/50 MPa, which was almost half that after the standard solution treatment. The decline of the thermal cycling creep properties was mainly due to the significant dissolution of γ′ precipitates. The creep holes/cracks were mainly distributed at the M6C carbides and γ/γ′ eutectics interfaces, M6C carbides and γ′ film interfaces in the grain boundaries, and resulted in the final intergranular fracture. View Full-Text
Keywords: K465 alloy; overheating; creep; cracks K465 alloy; overheating; creep; cracks
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MDPI and ACS Style

Guo, X.; Liang, Z.; Nan, X.; Jiang, C.; Li, Y.; Li, L.; He, L.; Yang, S. Effect of Overheating Temperature on Thermal Cycling Creep Properties of K465 Superalloy. Crystals 2021, 11, 1458. https://doi.org/10.3390/cryst11121458

AMA Style

Guo X, Liang Z, Nan X, Jiang C, Li Y, Li L, He L, Yang S. Effect of Overheating Temperature on Thermal Cycling Creep Properties of K465 Superalloy. Crystals. 2021; 11(12):1458. https://doi.org/10.3390/cryst11121458

Chicago/Turabian Style

Guo, Xiaotong, Zeshan Liang, Xiaobin Nan, Chunxu Jiang, Yong Li, Li Li, Liang He, and Shizheng Yang. 2021. "Effect of Overheating Temperature on Thermal Cycling Creep Properties of K465 Superalloy" Crystals 11, no. 12: 1458. https://doi.org/10.3390/cryst11121458

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