Abstract

Superplastic alloys exhibit extremely high ductility (>300%) without cracks when tensile-strained at temperatures above half of their melting point. Superplasticity, which resembles the flow behavior of honey, is caused by grain boundary sliding in metals. Although several non-ferrous and ferrous superplastic alloys are reported, their practical applications are limited due to high material cost, low strength after forming, high deformation temperature, and complicated fabrication process. Here we introduce a new compositionally lean (Fe-6.6Mn-2.3Al, wt.%) superplastic medium Mn steel that resolves these limitations. The medium Mn steel is characterized by ultrafine grains, low material costs, simple fabrication, i.e., conventional hot and cold rolling, low deformation temperature (ca. 650 °C) and superior ductility above 1300% at 850 °C. We suggest that this ultrafine-grained medium Mn steel may accelerate the commercialization of superplastic ferrous alloys.

Details

Title
Superplasticity in a lean Fe-Mn-Al steel
Author
Han, Jeongho 1 ; Seok-Hyeon Kang 2 ; Lee, Seung-Joon 3 ; Kawasaki, Megumi 4 ; Han-Joo, Lee 4 ; Ponge, Dirk 5 ; Raabe, Dierk 5 ; Young-Kook, Lee 2 

 Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea; Department of Materials Science and Engineering, Chungnam National University, Daejeon, Republic of Korea 
 Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea 
 Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea; Joining and Welding Research Institute, Osaka University, Osaka, Japan 
 Division of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea 
 Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany 
Pages
1-6
Publication year
2017
Publication date
Sep 2017
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1944568929
Copyright
© 2017. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.