Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels

Mburu, Sarah; Kolli, R. Prakash; Perea, Daniel E.; Schwarm, Samuel C.; Eaton, Arielle; Liu, Jia; Patel, Shiv; Bartrand, Jonah; Ankem, Sreeramamurthy

doi:10.1016/j.msea.2017.03.011

Title: Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels

Journal Article · Mon Mar 06 00:00:00 EST 2017 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2017.03.011· OSTI ID:1347967

Mburu, Sarah ^[1]; Kolli, R. Prakash ^[1]; Perea, Daniel E. ^[2]; Schwarm, Samuel C. ^[1]; Eaton, Arielle ^[2]; Liu, Jia ^[2]; Patel, Shiv ^[1]; Bartrand, Jonah ^[2]; Ankem, Sreeramamurthy ^[1]

Univ. of Maryland, College Park, MD (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC057601830; NE0000724; 0833018

OSTI ID:: 1347967

Alternate ID(s):: OSTI ID: 1415895

Report Number(s):: PNNL-SA-124944; PII: S092150931730299X; TRN: US1700648

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 690, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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