Phase Separation in Lean Grade Duplex Stainless Steel 2101

Journal Article · Wed Aug 19 00:00:00 EDT 2015 · Journal of The Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-015-1581-7· OSTI ID:1265661

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

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1. Oregon State Univ., Corvallis, OR (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)

The use of duplex stainless steels (DSS) in nuclear power generation systems is limited by thermal instability that leads to embrittlement in the temperature range of 204°C - 538°C. New lean grade alloys, such as 2101, offer the potential to mitigate these effects. Thermal embrittlement was quantified through impact toughness and hardness testing on samples of alloy 2101 after aging at 427°C for various durations (1-10,000 hours). Additionally, atom probe tomography (APT) was utilized in order to observe the kinetics of α-α’ separation and G-phase formation. Mechanical testing and APT data for two other DSS alloys, 2003 and 2205 were used as a reference to 2101. The results show that alloy 2101 exhibits superior performance compared to the standard grade DSS alloy, 2205, but inferior to the lean grade alloy, 2003, in mechanical testing. APT data demonstrates that the degree of α-α’ separation found in alloy 2101 closely resembles that of 2205, and greatly exceeds 2003. Additionally, contrary to what was observed in 2003, 2101 demonstrated G-phase like precipitates after long aging times, though precipitates were not as abundant as was observed in 2205.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1265661
• Journal Information: Journal of The Minerals, Metals & Materials Society, Journal Name: Journal of The Minerals, Metals & Materials Society Journal Issue: 10 Vol. 67; ISSN 1047-4838
• Publisher: Springer
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE