高温合金
材料科学
断裂力学
裂缝闭合
复合材料
热的
一致性(知识库)
热疲劳
燃烧室
燃烧
合金
冶金
结构工程
热力学
工程类
物理
有机化学
化学
数学
几何学
作者
Yujie Zhang,Cheng Hou,Xiaochao Jin,Dongxu Li,Linjie Zhao,Lina Yang,Xueling Fan
摘要
Abstract The drastic severe temperature cycle in an aero‐engine combustion chamber leads to large thermal fatigue stress, which may induce thermal fatigue failure of the combustion chamber. In this paper, thermal fatigue crack initiation and propagation behaviors of GH3230 nickel‐based superalloy sheet specimens with V‐notch were studied under different peak temperatures 800°C, 900°C, and 1,000°C using self‐built thermal fatigue equipment. The temperature, stress, and crack propagation driving force of the V‐notch specimen were discussed in detail. Results show that the thermal fatigue crack initiation life gradually decreases with the increase of the peak temperature. Oxidation caused by high temperature will weaken alloy's strength and accelerate its crack propagation. Higher peak temperature will make the crack propagate faster and the thermal deformation at V‐notch end easier to accumulate. At last, there is a good consistency between fitting curves from the modified Paris formula and the experiment results.
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