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 | |
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