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Matrix strength evaluation of ultra-fine grained steel by nanoindentation

Published online by Cambridge University Press:  03 March 2011

T. Ohmura ,
K. Tsuzaki ,
N. Tsuji  and
N. Kamikawa
T. Ohmura
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
K. Tsuzaki
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
N. Tsuji
Affiliation:
Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
N. Kamikawa
Affiliation:
Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Abstract

Nanoindentation was performed to evaluate the matrix strength of the ultra-fine grained steel produced by accumulative roll-bonding and subsequently annealed. The nanohardness, associated with the matrix strength, decreases with increasing annealing temperature. Because the matrix strength corresponds to the first term σ0 of the Hall–Petch relation, this result suggests that the σ0 might not be constant for these steels between various grain sizes. Therefore, it is suggested that the change of the macroscopic strength during annealing is dominated by not only the grain coarsening leading to a reduction of grain refinement strengthening, but also the softening of the matrix strength.

Keywords

AnnealingGrain sizeNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 347 - 350
Copyright
Copyright © Materials Research Society 2004

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