期刊
ADDITIVE MANUFACTURING
卷 36, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.addma.2020.101624
关键词
Chromium; Laser powder bed fusion; High-temperature oxidation; Crystallographic texture; Microstructure; Grain boundary
资金
- Japan Society for the Promotion of Science (JSPS) [JP18H05254]
- Cross-Ministerial Strategic Innovation Promotion Program (SIP), - Materials Integration for Revolutionary Design System of Structural Materials-, Domain C1: Development of Additive Manufacturing Process for Ni-based Alloy from the Japan Science and Techn
This is the first comprehensive study on the development of a cubic crystallographic texture in pure chromium (Cr) manufactured using laser powder bed fusion (LPBF) with different laser energy densities to alter its microstructure and high-temperature oxidation behavior. An increase in the laser energy density led to the formation of a strong crystallographic texture, which was preferentially oriented in the (100) plane, and there were microstructural improvements in the pure Cr. The grain size of the (100)-oriented Cr was larger than that of the randomly oriented Cr. In addition, the high-angle grain boundary and coincident site lattice (CSL) boundary characteristics were altered. The (100)-oriented Cr exhibited a decrease in the oxide thickness that was due to the decrease in the grain boundary density with a larger grain size and an increase in the CSL boundary ratio. In contrast, the Cr with a random texture showed higher oxidation kinetics and spallation of the oxide layer. The oxidation kinetics of the pure Cr manufactured using LPBF obeyed the parabolic rate law. However, the crystal orientation affected the oxidation of the Cr as the (100)-oriented pure Cr displayed a lower parabolic rate constant, indicating that the (100)-oriented Cr was oxidation-resistant. This is the first report to demonstrate the cubic crystallographic texture formation and the improvement of high-temperature oxidation resistance in Cr manufactured using LPBF.
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