High ductility of ultrafine-grained steel via phase transformation

S. Cheng, H. Choo, Y. H. Zhao, X. L. Wang, Y. T. Zhu, Y. D. Wang, J. Almer, P. K. Liaw, J. E. Jin, Y. K. Lee

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


There is often a tradeoff between strength and ductility, and the low ductility of ultrafine-grained (UFG) materials has been a major obstacle to their practical structural applications despite their high strength. In this study, we have achieved a ∼40% tensile ductility while increasing the yield strength of FeCrNiMn steel by an order of magnitude via grain refinement and deformation-induced martensitic phase transformation. The strain-rate effect on the inhomogeneous deformation behavior and phase transformation was studied in detail.

Original languageEnglish
Pages (from-to)1578-1586
Number of pages9
JournalJournal of Materials Research
Issue number6
Publication statusPublished - 2008 Jun

All Science Journal Classification (ASJC) codes

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


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