In situ synchrotron tensile investigations on the phase responses within an oxide dispersion-strengthened (ODS) 304 steel

Yinbin Miao, Kun Mo, Zhangjian Zhou, Xiang Liu, Kuan Che Lan, Guangming Zhang, Michael K. Miller, Kathy A. Powers, Jonathan Almer, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Austenitic oxide dispersion-strengthened (ODS) alloys provide excellent mechanical strength and radiation tolerance along with their intrinsic advantages in corrosion resistance and high temperature creep resistance. This paper reports the in situ synchrotron X-ray diffraction (XRD) tensile test results of ODS 304 stainless steel specimens. The oxygen-enriched nanoparticles were first characterized by both atom probe tomography (APT) and analytic scanning transmission electron microscopy (STEM). Three different types of precipitate phases were recognized, including large scale (around 100. nm) TiN, intermediate scale (around 20. nm) Y-Al-O, and small scale (<5. nm) Y-Ti-O. The lattice responses of different phases within the alloy to the externally applied stress indicate a prominent load partitioning phenomenon. This phenomenon was found to be highly dependent on the size of the precipitates. In addition, deformation-induced martensitic transformation was examined by the modified Williamson-Hall analyses of peak broadening, and was found to be different from that in ordinary 304 stainless steel.

Original languageEnglish (US)
Pages (from-to)146-152
Number of pages7
JournalMaterials Science and Engineering A
Volume625
DOIs
StatePublished - Feb 1 2015

Keywords

  • Atom probe tomography
  • Oxide-dispersion strengthened steel
  • Structure materials
  • Synchrotron
  • Transmission electron microscopy
  • Wide-angle X-ray scattering

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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