A crack growth model for nickel-based powder metallurgy superalloy considering creep zone at crack tip

被引：0
|
作者：
Wan, Yuwei [1 ,2 ]
Hu, Xuteng [1 ,2 ,3 ]
Song, Yingdong [1 ,2 ]
Cui, Haitao [1 ,2 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Jiangsu Prov Key Lab Aerosp Power, Nanjing 210016, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Key Lab thermal Environm & Thermal Struct, MIIT, Nanjing 210016, Peoples R China
[3] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Nanjing 210016, Peoples R China
来源：
MATERIALS TODAY COMMUNICATIONS | 2023年 / 35卷
关键词：
Nickel-base powder metallurgy superalloy; Creep crack growth; Crack growth rate model; Crack tip state; Creep zone; FINITE-ELEMENT SIMULATION; ELEVATED-TEMPERATURE; FATIGUE; BEHAVIOR; DEFORMATION; CLOSURE; STRESS;
D O I：
10.1016/j.mtcomm.2023.106026
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, the creep crack growth behavior of powder alloy materials for turbine disks was studied. The experimental results show that the creep crack growth rate at 700 & DEG;C is significantly higher than that at 600 & DEG;C, and the main form of the crack growth is intergranular fracture. It is found that there is an obvious dispersion state in the early stage of creep crack growth, which cannot be described by creep fracture parameters based on the linear elastic assumption, such as C(t),Ct. To solve this problem, a rate model considering creep zone at crack tip was proposed, which can describe the crack growth rate curve uniformly. The prediction deviation of creep crack growth time is approximately 1.5X.
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页数：9
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