Concepts for the development of nanoscale stable precipitation-strengthened steels manufactured by conventional methods

Journal Article · Tue Nov 11 00:00:00 EST 2014 · Journal of The Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-014-1204-8· OSTI ID:1246943

Yablinsky, C. A. ^[1]; Tippey, K. E. ^[2]; Vaynman, S. ^[3]; Anderoglu, O. ^[1]; Fine, M. E. ^[3]; Chung, Y. -W. ^[3]; Speer, J. G. ^[2]; Findley, K. O. ^[2]; Dogan, O. N. ^[4]; Jablonski, P. D. ^[4]; Maloy, S. A. ^[1]; Hackenberg, R. E. ^[1]; Clarke, A. J. ^[1]; Clarke, K. D. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Colorado School of Mines, Golden, CO (United States)
3. Northwestern Univ., Evanston, IL (United States)
4. National Energy Technology Lab. (NETL), Albany, OR (United States)

In this study, the development of oxide dispersion strengthened ferrous alloys has shown that microstructures designed for excellent irradiation resistance and thermal stability ideally contain stable nanoscale precipitates and dislocation sinks. Based upon this understanding, the microstructures of conventionally manufactured ferritic and ferritic-martensitic steels can be designed to include controlled volume fractions of fine, stable precipitates and dislocation sinks via specific alloying and processing paths. The concepts proposed here are categorized as advanced high-Cr ferritic-martensitic (AHCr-FM) and novel tailored precipitate ferritic (TPF) steels, which have the potential to improve the in-reactor performance of conventionally manufactured alloys. AHCr-FM steels have modified alloy content relative to current reactor materials (such as alloy NF616/P92) to maximize desirable precipitates and control phase stability. TPF steels are designed to incorporate nickel aluminides, in addition to microalloy carbides, in a ferritic matrix to produce fine precipitate arrays with good thermal stability. Both alloying concepts may also benefit from thermomechanical processing to establish dislocation sinks and modify phase transformation behaviors. Alloying and processing paths toward designed microstructures are discussed for both AHCr-FM and TPF material classes.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1246943
• Report Number(s): LA-UR-14-26761; PII: 1204
• Journal Information: Journal of The Minerals, Metals & Materials Society, Vol. 66, Issue 12; ISSN 1047-4838
• Publisher: Springer
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE