Effect of grain size on the uniform ductility of a bulk ultrafine-grained alloy

Jae Eun Jin, Yeon Seung Jung, Young-Kook Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

A bulk metastable austenitic alloy with different ultrafine grain sizes (0.3, 0.6, and 2 μm) was fabricated by a repetitive thermomechanical process consisting of conventional cold rolling and annealing. The ultrafine-grained specimens showed not only high tensile strength (∼900 MPa) but also large elongation (∼40%) because of the strain hardening enhanced by the strain-induced martensitic transformation during tensile test. The uniform elongation of the ultrafine-grained specimens was divided into two different regions: the lower strain-hardened region (Region I) governed by dislocation plasticity in austenite, and the higher strain-hardened region (Region II) dominated by strain-induced martensitic transformation. The finer grain size, the wider the lower strain-hardened region the narrower the higher strain-hardened region and total uniform elongation of ultrafine-grained austenitic alloy.

Original languageEnglish
Pages (from-to)786-789
Number of pages4
JournalMaterials Science and Engineering A
Volume448-451
DOIs
Publication statusPublished - 2007 Mar 25

Fingerprint

ductility
elongation
Ductility
grain size
martensitic transformation
Elongation
cold rolling
strain hardening
Martensitic transformations
tensile tests
austenite
plastic properties
tensile strength
annealing
Cold rolling
Strain hardening
Austenite
Plasticity
Ultrafine
Tensile strength

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "A bulk metastable austenitic alloy with different ultrafine grain sizes (0.3, 0.6, and 2 μm) was fabricated by a repetitive thermomechanical process consisting of conventional cold rolling and annealing. The ultrafine-grained specimens showed not only high tensile strength (∼900 MPa) but also large elongation (∼40{\%}) because of the strain hardening enhanced by the strain-induced martensitic transformation during tensile test. The uniform elongation of the ultrafine-grained specimens was divided into two different regions: the lower strain-hardened region (Region I) governed by dislocation plasticity in austenite, and the higher strain-hardened region (Region II) dominated by strain-induced martensitic transformation. The finer grain size, the wider the lower strain-hardened region the narrower the higher strain-hardened region and total uniform elongation of ultrafine-grained austenitic alloy.",
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Effect of grain size on the uniform ductility of a bulk ultrafine-grained alloy. / Jin, Jae Eun; Jung, Yeon Seung; Lee, Young-Kook.

In: Materials Science and Engineering A, Vol. 448-451, 25.03.2007, p. 786-789.

Research output: Contribution to journalArticle

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