TY - JOUR
T1 - Transition of deformation mechanism with grain refinement in interstitial-free steel
AU - Itoh, Shun
AU - Nakazawa, Kasane
AU - Matsunaga, Tetsuya
AU - Matsukawa, Yoshitaka
AU - Satoh, Yuhki
AU - Abe, Hiroaki
PY - 2014
Y1 - 2014
N2 - To examine effects of the grain boundary (GB) and dislocation on the deformation mechanism for ultrafine-grained (UFG) and coarse-grained (CG) interstitial-free (IF) steels at room temperature, tensile tests and several types of microscopy were conducted for each steel. Atomic force microscopy revealed that the contribution of grain-boundary sliding (GBS) on deformation increased more prominently in UFG region than in CG region. Moreover, transmission electron microscopy revealed that dislocation motion was dominant in CG steel, where cell structure was formed with increasing strain. On the other hand, although dislocations moved in UFG steel, they did not tangle and piled up at GB, where interaction between GB and dislocation occurred markedly, causing significant GBS. Therefore, the dominant deformation mechanism changed from dislocation motion to GBS by decreasing grain size in IF steel.
AB - To examine effects of the grain boundary (GB) and dislocation on the deformation mechanism for ultrafine-grained (UFG) and coarse-grained (CG) interstitial-free (IF) steels at room temperature, tensile tests and several types of microscopy were conducted for each steel. Atomic force microscopy revealed that the contribution of grain-boundary sliding (GBS) on deformation increased more prominently in UFG region than in CG region. Moreover, transmission electron microscopy revealed that dislocation motion was dominant in CG steel, where cell structure was formed with increasing strain. On the other hand, although dislocations moved in UFG steel, they did not tangle and piled up at GB, where interaction between GB and dislocation occurred markedly, causing significant GBS. Therefore, the dominant deformation mechanism changed from dislocation motion to GBS by decreasing grain size in IF steel.
KW - Atomic force microscopy
KW - Dislocation structure
KW - Grain-boundary sliding
KW - Interstitial-free steel
KW - Ultrafine-grain
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U2 - 10.2355/isijinternational.54.1729
DO - 10.2355/isijinternational.54.1729
M3 - Article
AN - SCOPUS:84906725725
VL - 54
SP - 1729
EP - 1734
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 7
ER -