TY - JOUR
T1 - Dynamic recrystallization in biomedical Co-29Cr-6Mo-0.16N alloy with low stacking fault energy
AU - Li, Yunping
AU - Koizumi, Yuichiro
AU - Chiba, Akihiko
N1 - Funding Information:
This research was partially supported by a Cooperation of Innovative Technology and Advanced Research in Evolutional Area from Ministry of Education, Culture, Sports, Science and Technology of Japan.
Publisher Copyright:
© 2016.
PY - 2016/6/21
Y1 - 2016/6/21
N2 - Dynamic recrystallization (DRX) behaviors of biomedical Co-29Cr-6Mo-0.16N (CCMN) alloy were analyzed in detail in hot compressive tests. At low temperature (≤1050 °C) and low strain rate (≤1 s-1), DRXed grains preferentially nucleate along pre-existing grain boundaries or σ3n boundaries, with a result of necklace microstructure broadening with increasing strain; while at higher temperature and/or higher strain rate, DRX occurs uniformly in matrix resulting in homogenous and texture-free fine grained microstructure. These two kinds of DRXed microstructures formed in CCMN alloy are related the repeated formation of annealing twin during hot deformation, which was determined by both the temperature and the activity of stacking fault formation. It was also found that the σ3n boundaries formed at lower strain level will evolve into general high angle grain boundaries (HAGB) with further straining. A schematic model for DRX mechanism of CCMN alloy was proposed with respect to temperature, strain rate, and strain.
AB - Dynamic recrystallization (DRX) behaviors of biomedical Co-29Cr-6Mo-0.16N (CCMN) alloy were analyzed in detail in hot compressive tests. At low temperature (≤1050 °C) and low strain rate (≤1 s-1), DRXed grains preferentially nucleate along pre-existing grain boundaries or σ3n boundaries, with a result of necklace microstructure broadening with increasing strain; while at higher temperature and/or higher strain rate, DRX occurs uniformly in matrix resulting in homogenous and texture-free fine grained microstructure. These two kinds of DRXed microstructures formed in CCMN alloy are related the repeated formation of annealing twin during hot deformation, which was determined by both the temperature and the activity of stacking fault formation. It was also found that the σ3n boundaries formed at lower strain level will evolve into general high angle grain boundaries (HAGB) with further straining. A schematic model for DRX mechanism of CCMN alloy was proposed with respect to temperature, strain rate, and strain.
KW - Annealing twinning
KW - Co-29Cr-6Mo-0.16N alloy
KW - Dynamic recrystallization
KW - EBSD
KW - Stacking fault
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U2 - 10.1016/j.msea.2016.05.045
DO - 10.1016/j.msea.2016.05.045
M3 - Article
AN - SCOPUS:84969170543
VL - 668
SP - 86
EP - 96
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -