On the microstructure and strengthening mechanism in oxide dispersion-strengthened 316 steel: A coordinated electron microscopy, atom probe tomography and in situ synchrotron tensile investigation

Journal Article · Tue May 26 00:00:00 EDT 2015 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2015.05.064· OSTI ID:1279425

Miao, Yinbin ^[1]; Mo, Kun ^[2]; Zhou, Zhangjian ^[3]; Liu, Xiang ^[1]; Lan, Kuan -Che ^[1]; Zhang, Guangming ^[4]; Miller, Michael K. ^[5]; Powers, Kathy A. ^[5]; Mei, Zhi -Gang ^[2]; Park, Jun -Sang ^[2]; Almer, Jonathan ^[2]; Stubbins, James F. ^[1]

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1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
2. Argonne National Lab. (ANL), Lemont, IL (United States)
3. Univ. of Science and Technology Beijing, Beijing (China)
4. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Univ. of Science and Technology Beijing, Beijing (China)
5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this study, an oxide dispersion-strengthened (ODS) 316 steel was developed to simultaneously provide the advantages of ODS steels in mechanical strength and radiation tolerance as well as the excellence of austenitic steels in creep performance and corrosion resistance. The precipitate phases within the austenite matrix were identified by the combined techniques of atom probe tomography (APT), scanning transmission electron microscopy equipped with electron dispersive X-ray spectroscopy (STEM-EDS), and synchrotron wide-angle and small-angle X-ray scattering (WAXS and SAXS). Coarse TiN, hexagonal YAlO₃ and orthorhombic YAlO₃ precipitates were found along with fine Y-Ti-O nanoparticles. In situ WAXS experiments were performed at room and elevated temperatures to examine the size effect on the load partitioning phenomenon for TiN, hexagonal YAlO₃ and Y₂Ti₂O₇ phases. In addition, the dislocation density evolution throughout the tensile tests was analyzed by the modified Williamson-Hall method and confirmed by transmission electron microscopy (TEM) observations, revealing the difference in plasticity at various temperatures.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1279425
• Journal Information: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 639, Issue C; ISSN 0921-5093
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
oxide dispersion-strengthened steel
atom probe tomography
scanning transmission electron microscopy
synchrotron X-ray scattering