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

Jae Eun Jin; Yeon Seung Jung; Young Kook Lee

doi:10.1016/j.msea.2006.02.350

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

Jae Eun Jin, Yeon Seung Jung, Young Kook Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

43 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 language	English
Pages (from-to)	786-789
Number of pages	4
Journal	Materials Science and Engineering A
Volume	448-451
DOIs	https://doi.org/10.1016/j.msea.2006.02.350
Publication status	Published - 2007 Mar 25

Bibliographical note

Funding Information:
This work was financially supported by the Ministry of Commerce, Industry and Energy of Korea. The authors acknowledge the support.

All Science Journal Classification (ASJC) codes

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

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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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AU - Jin, Jae Eun

AU - Jung, Yeon Seung

AU - Lee, Young Kook

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

Abstract

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