Journal
MATERIALS CHARACTERIZATION
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.111903
Keywords
Fatigue; 304 stainless steel; Synchrotron; Tomography; Crack propagation
Categories
Funding
- DOE, Nuclear Engineering University Program (NEUP) Integrated Research Program (IRP) [IRP-15-9318, DE-NE0008442]
- FUTURE (Fundamental Understanding of Transport Under Reactor Extremes), Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- State of North Carolina
- National Science Foundation [ECCS-1542015]
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The effect of fatigue on the microstructure of three variations of 304 stainless steels was investigated using synchrotron x-ray tomography and diffraction. It was found that fatigue induced the formation of microvoids and cracks, and the chemical nature and shape of precipitates/inclusions played a role in microvoid formation.
The effect of fatigue on the microstructure of four-point bend specimens of three variations of 304 stainless steels (Commercial 304, 304H, and 304 L) was investigated using synchrotron x-ray tomography and diffraction. X-ray tomography revealed the formation of the fatigue-induced microvoids and crack while the diffraction data was used to quantify the amount of deformation-induced martensite found after fatigue in all samples. Transmission electron microscopy evidenced the role of the precipitates/inclusions on the microvoid formation. It was found to depend on their chemical nature. The shape of the precipitates/inclusions was also found to have an effect on the microvoid shape.
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