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High ductility of ultrafine-grained steel via phase transformation

Published online by Cambridge University Press:  31 January 2011

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
*
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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.

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Copyright
Copyright © Materials Research Society 2008

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