TY - JOUR
T1 - Effect of grain size on the uniform ductility of a bulk ultrafine-grained alloy
AU - Jin, Jae Eun
AU - Jung, Yeon Seung
AU - Lee, Young Kook
PY - 2007/3/25
Y1 - 2007/3/25
N2 - 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.
AB - 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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U2 - 10.1016/j.msea.2006.02.350
DO - 10.1016/j.msea.2006.02.350
M3 - Article
AN - SCOPUS:33847209873
VL - 448-451
SP - 786
EP - 789
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -