TY - JOUR
T1 - Matrix strength evaluation of ultra-fine grained steel by nanoindentation
AU - Ohmura, T.
AU - Tsuzaki, K.
AU - Tsuji, N.
AU - Kamikawa, N.
PY - 2004/1
Y1 - 2004/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=4444342938&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4444342938&partnerID=8YFLogxK
U2 - 10.1557/jmr.2004.0039
DO - 10.1557/jmr.2004.0039
M3 - Article
AN - SCOPUS:4444342938
SN - 0884-2914
VL - 19
SP - 347
EP - 350
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 1
ER -