Affiliation:
1. Xi'an Key Laboratory of Extreme Environmental and Protection Technology School of Aerospace Engineering, Xi'an Jiaotong University Xi'an China
2. School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
3. College of Mechanical Engineering Xi'an University of Science and Technology Xi'an China
Abstract
AbstractThe 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.
Funder
National Science and Technology Major Project
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science