Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels
Abstract
The microstructure and mechanical properties in unaged and thermally aged (at 280 °C, 320 °C, 360 °C, and 400 °C to 4300 h) CF–3 and CF–8 cast duplex stainless steels (CDSS) are investigated. The unaged CF–8 steel has Cr-rich M23C6 carbides located at the δ–ferrite/γ–austenite heterophase interfaces that were not observed in the CF–3 steel and this corresponds to a difference in mechanical properties. Both unaged steels exhibit incipient spinodal decomposition into Fe-rich α–domains and Cr-rich α’–domains. During aging, spinodal decomposition progresses and the mean wavelength (MW) and mean amplitude (MA) of the compositional fluctuations increase as a function of aging temperature. Additionally, G–phase precipitates form between the spinodal decomposition domains in CF–3 at 360 °C and 400 °C and in CF–8 at 400 °C. Finally, the microstructural evolution is correlated to changes in mechanical properties.
- Authors:
-
- Univ. of Maryland, College Park, MD (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1347967
- Alternate Identifier(s):
- OSTI ID: 1415895
- Report Number(s):
- PNNL-SA-124944
Journal ID: ISSN 0921-5093; PII: S092150931730299X; TRN: US1700648
- Grant/Contract Number:
- AC057601830; NE0000724; 0833018
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 690; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; spinodal decomposition; duplex stainless steel; atom probe tomography; M23C6 carbide; G–phase
Citation Formats
Mburu, Sarah, Kolli, R. Prakash, Perea, Daniel E., Schwarm, Samuel C., Eaton, Arielle, Liu, Jia, Patel, Shiv, Bartrand, Jonah, and Ankem, Sreeramamurthy. Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels. United States: N. p., 2017.
Web. doi:10.1016/j.msea.2017.03.011.
Mburu, Sarah, Kolli, R. Prakash, Perea, Daniel E., Schwarm, Samuel C., Eaton, Arielle, Liu, Jia, Patel, Shiv, Bartrand, Jonah, & Ankem, Sreeramamurthy. Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels. United States. https://doi.org/10.1016/j.msea.2017.03.011
Mburu, Sarah, Kolli, R. Prakash, Perea, Daniel E., Schwarm, Samuel C., Eaton, Arielle, Liu, Jia, Patel, Shiv, Bartrand, Jonah, and Ankem, Sreeramamurthy. Mon .
"Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels". United States. https://doi.org/10.1016/j.msea.2017.03.011. https://www.osti.gov/servlets/purl/1347967.
@article{osti_1347967,
title = {Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels},
author = {Mburu, Sarah and Kolli, R. Prakash and Perea, Daniel E. and Schwarm, Samuel C. and Eaton, Arielle and Liu, Jia and Patel, Shiv and Bartrand, Jonah and Ankem, Sreeramamurthy},
abstractNote = {The microstructure and mechanical properties in unaged and thermally aged (at 280 °C, 320 °C, 360 °C, and 400 °C to 4300 h) CF–3 and CF–8 cast duplex stainless steels (CDSS) are investigated. The unaged CF–8 steel has Cr-rich M23C6 carbides located at the δ–ferrite/γ–austenite heterophase interfaces that were not observed in the CF–3 steel and this corresponds to a difference in mechanical properties. Both unaged steels exhibit incipient spinodal decomposition into Fe-rich α–domains and Cr-rich α’–domains. During aging, spinodal decomposition progresses and the mean wavelength (MW) and mean amplitude (MA) of the compositional fluctuations increase as a function of aging temperature. Additionally, G–phase precipitates form between the spinodal decomposition domains in CF–3 at 360 °C and 400 °C and in CF–8 at 400 °C. Finally, the microstructural evolution is correlated to changes in mechanical properties.},
doi = {10.1016/j.msea.2017.03.011},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 690,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}
Web of Science
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