Creep Fracture Characteristics of Nickel-Based Single Crystal Superalloy at Different Temperatures

HAN Fengkui; LIU Beilei; WU Baoping; XUE Xin; ZHAO Jingxuan

doi:10.11973/jxgccl202210010

Materials and Mechanical Engineering > 2022 > 46(10): 56-60. > DOI: 10.11973/jxgccl202210010

HAN Fengkui, LIU Beilei, WU Baoping, XUE Xin, ZHAO Jingxuan. Creep Fracture Characteristics of Nickel-Based Single Crystal Superalloy at Different Temperatures[J]. Materials and Mechanical Engineering, 2022, 46(10): 56-60. DOI: 10.11973/jxgccl202210010

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Creep Fracture Characteristics of Nickel-Based Single Crystal Superalloy at Different Temperatures

HAN Fengkui^1,2,3,
LIU Beilei^2,3,
WU Baoping^2,3,
XUE Xin^2,3,
ZHAO Jingxuan^2,3

1. High Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Gaona Aero Material Co., Ltd., Beijing 100081, China;
3. Hebei CISRI Dekai Technology Co., Ltd., Zhuozhou 072750, China

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Received Date: May 12, 2021
Revised Date: May 21, 2022

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Abstract

Creep tests were carried out on DD407 single crystal superalloy under different conditions (760℃/750 MPa, 850℃/500 MPa, 980℃/260 MPa, 1 050℃/140 MPa). The creep fracture morphology and the microstructure and dislocations after creep fracture were observed. The mechanism of creep fracture was analyzed. The results show that at 760℃, the test alloy fractured in slip shear modes, and the strengthening phase γ' was slightly deformed, but no obvious rafting structures were found; creep dislocations were mainly distributed at the γ/γ' phase interface, and only a small number of dislocations entered the γ' phase. At 850℃, the alloy still mainly fractured in slip shear modes, and the γ' phase began to show rafting structures. At 980℃ and 1 050℃, the alloy had ductile fracture, and the rafting of the γ' phase became more serious with the creep temperature. Under the condition of 1 050℃/140 MPa, a large number of dislocations were packed in the γ matrix channel, and a large number of dislocations cut into the γ' phase in the form of long straight dislocation lines.
- Ni-based single crystal superalloy,
- creep,
- γ' phase,
- rafting,
- dislocation

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