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Title: 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 M 23C 6 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:
 [1];  [1];  [2];  [1];  [2];  [2];  [1];  [2];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Nuclear Energy (NE)
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; DE–NE0000724
Resource Type:
Journal Article: 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. 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, and Ankem, Sreeramamurthy. Mon . "Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels". United States. doi: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}
}

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