Influence of Alloying on α-α' Phase Separation in Duplex Stainless Steels

Conference · Sun Oct 01 04:00:00 EDT 2017

DOI:https://doi.org/10.1007/978-3-030-04639-2_161· OSTI ID:1495985

Garfinkel, David A. ^[1]; Poplawsky, Jonathan D. ^[1]; Guo, Wei ^[1]; Young, George A. ^[2]; Tucker, Julie ^[3]

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1. ORNL
2. Knolls Atomic Power Laboratory
3. Oregon State University

Thermal embrittlement caused by phase transformations in the temperature range of 204–538 °C limits the service temperature of duplex stainless steels. The present study investigates a set of wrought (2003, 2101, and 2205) and weld (2209-w and 2101-w) alloys in order to better understand how alloying elements affect thermal embrittlement. Samples were aged at 427 °C for up to 10,000 h. The embrittlement and thermal instability were assessed via nanoindentation, impact toughness testing, and atom probe tomography (APT). Results demonstrate that the spinodal amplitude is not an accurate predictor of mechanical degradation, and that nanoindentation within the ferrite grains served as a reasonable approximate for the embrittlement behavior. Compositionally, alloys with a lower concentration of Cr, Mo, and Ni were found to exhibit superior mechanical properties following aging.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1495985
• Country of Publication: United States
• Language: English