Superplastic steels with high elongations above 300% are expected to be used for manufacturing complex-shaped mechanical parts without joining. However, their practical application is difficult due to high energy consumption and surface oxidation caused by a high deformation temperature (≥873 K). Here, we propose a new high strength Fe–10Mn-3.5Si steel, which is superplastically deformed at 763 K. This steel exhibits different microstructural and deformation features from previous superplastic steels, such as single phase before deformation, coarse elongated grains, low strain rate sensitivity, and strong texture. The superplasticity of the steel results from both dislocation creep and grain boundary sliding due to dynamic reverse transformation. Because the steel has a low material cost and is produced by conventional rolling, it is suitable for practical application.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant number: NRF-2018R1D1A1A09083753 ) and the Technology Innovation Program (Alchemist Project, 20012196 , AI-based supercritical materials discovery) funded by the Ministry of Trade, Industry & Energy, Korea .
© 2022 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering