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ABSTRACT
Damage behaviour and deformation mechanism of SA387Gr11CL2 (1.25Cr-0.5Mo) low alloy steel for coke drum in the thermomechanical fatigue regime are investigated. The experimental results indicate that a main macroscopic crack is detected in the gauge section of each testing specimen. Multiple crack initiation sources are observed in the fracture surface. There are a great deal of secondary cracks in the crack propagation region of the fracture surface. Longitudinal-section microcrack initiates on the specimen surface and its propagation path is predominantly transgranular. When the crack propagation arrives at the threshold with the cyclic number increase, crack bifurcation is obviously observed. Fatigue is the dominant damage of SA387Gr11CL2 low alloy steel under the thermomechanical fatigue loading. The dominant deformation mechanism of SA387Gr11CL2 low alloy steel during thermomechanical fatigue cycle is wavy slip of dislocations. The types and morphologies of carbides in SA387Gr11CL2 low alloy steel are not changed after plastic deformation.
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Acknowledgments
This work was supported by National Key Research and Development Project of China (Grant No. 2021YFC3001804).
Disclosure statement
No potential conflict of interest was reported by the author(s).
Authors’ contributions
The author contributions are as follows: Zhibing Lu was in charge of conceptualization, investigation, testing, data analysis, and writing original draft. Xuedong Chen was in charge of conceptualization, methodology, and writing review & editing. Zhichao Fan was in charge of methodology and writing review & editing. Jie Dong was in charge of methodology and writing review & editing.