Room temperature ductility of NiAl-strengthened ferritic steels: Effects of precipitate microstructure

Z. K. Teng*, C. T. Liu, M. K. Miller, G. Ghosh, E. A. Kenik, S. Huang, P. K. Liaw

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The effects of precipitate microstructure on the room temperature ductility of a series of carefully designed Fe-Al-Ni-Cr-Mo steels were investigated. Transmission electron microscopy (TEM), ultra small angle X-ray scattering (USAXS), and atom probe tomography (APT) were conducted to quantify the nano-scaled precipitates. The accuracy of the characterization results was verified by a numerical analysis. Three point bending tests results demonstrated that ductility was a function of the precipitate volume fraction and the Al and Ni concentrations in the Fe matrix, these relationships were discussed in terms of possible mechanisms. The ductility was also found to be independent of the precipitate size and inter-particle spacing in the studied range, which was validated by a theoretical model.

Original languageEnglish (US)
Pages (from-to)22-27
Number of pages6
JournalMaterials Science and Engineering A
Volume541
DOIs
StatePublished - Apr 15 2012

Keywords

  • Ductility
  • Ferritic steels
  • NiAl
  • Precipitation

ASJC Scopus subject areas

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

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