Characterization of Alloy 600 joints exposed to a high-temperature supercritical-carbon dioxide environment
- Korea Advanced Institute of Science and Technology, 34141 Daejeon (Korea, Republic of)
Highlights: • Diffusion-bond showed similar corrosion and carburization behavior as parent matrix. • Diffusion-bond line migrated due to the Cr-depletion induced recrystallization. • Alloy 182 fusion-weld showed larger weight gains with outer Mn-rich oxides. • The presence of SiO{sub 2} in chromia suppressed carburization at the oxide/matrix interface. • Despite larger weight gains, Alloy 182 fusion-weld showed negligible tensile property changes. - Abstract: Two types of Alloy 600 joints, such as diffusion-bonded joint and Alloy 182 fusion-weld, were exposed to supercritical-CO{sub 2} environment at 550 and 650 °C (20 MPa) for 1000 h. The diffusion-bond region showed similar oxidation characteristics as parent Alloy 600, but the migration of diffusion bond line below oxide layer was observed due to the Cr-depletion induced recrystallization. For Alloy 182 fusion-weld, outer Mn-rich oxides (Mn{sub 3}O{sub 4} and MnCr{sub 2}O{sub 4}) and a small amount of inner SiO{sub 2} mixed with chromia were formed due to high Mn and Si contents. The presence of SiO{sub 2} in chromia suppressed carburization at the oxide/matrix interface, which resulted in the formation of an amorphous C layer between the outer Mn-rich oxide and inner Cr-rich oxide. For Alloy 182 fusion-weld, tensile property changes after exposure to supercritical-CO{sub 2} environment were negligible.
- OSTI ID:
- 22804957
- Journal Information:
- Materials Characterization, Vol. 138; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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