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High ductility of ultrafine-grained steel via phase transformation

Published online by Cambridge University Press:  31 January 2011

S. Cheng ,
H. Choo ,
Y.H. Zhao ,
X-L. Wang ,
Y.T. Zhu ,
Y.D. Wang ,
J. Almer ,
P.K. Liaw ,
J.E. Jin  and
Y.K. Lee
S. Cheng
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; and Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
H. Choo*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Y.H. Zhao
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
X-L. Wang
Affiliation:
Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Y.T. Zhu
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Y.D. Wang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
J. Almer
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
P.K. Liaw
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
J.E. Jin
Affiliation:
Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
Y.K. Lee*
Affiliation:
Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
*
a)e-mail: hchoo@utk.edu
b)e-mail: yklee@yonsei.ac.kr
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Abstract

There is often a tradeoff between strength and ductility, and the low ductility of ultrafine-grained (UFG) materials has been a major obstacle to their practical structural applications despite their high strength. In this study, we have achieved a ∼40% tensile ductility while increasing the yield strength of FeCrNiMn steel by an order of magnitude via grain refinement and deformation-induced martensitic phase transformation. The strain-rate effect on the inhomogeneous deformation behavior and phase transformation was studied in detail.

Keywords

Grain sizePhase transformationStrength
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1578 - 1586
Copyright
Copyright © Materials Research Society 2008

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References

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