TY - JOUR
T1 - Effect of processing parameters on the hot deformation behavior of as-cast TC21 titanium alloy
AU - Zhu, Y. C.
AU - Zeng, W. D.
AU - Liu, J. L.
AU - Zhao, Y. Q.
AU - Zhou, Y. G.
AU - Yu, H. Q.
PY - 2012/1
Y1 - 2012/1
N2 - Isothermal compression tests of as-cast Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb (TC21) titanium alloy are conducted in the deformation temperature ranging from 1000 to 1150°C with an interval of 50°C, strain rate ranging from 0.01 to 10.0s-1 and height reductions of 30%, 45%, 60% and 75% on a computer controlled Gleeble 3500 simulator. The true stress-strain curves under different deformation conditions are obtained. Based on the experimental data, the effects of deformation parameters on the hot deformation behavior of as-cast TC21 alloy were studied. The deformation mechanisms of the alloy in the whole regimes are predicted by the power dissipation efficiency and instability parameter and further investigated through the microstructure observation. It is found that at the height reductions of 30%, 45% and 60%, the softening of stress-strain curves at high strain rate (>1.0s-1) is mainly associated with flow localization, which is caused by local temperature rise, whereas at low strain rate, the softening is associated with dynamic recrystallization (DRX). However, the instability showed in flow localization occurs at low strain rate of 0.01s-1 when the height reduction reaches 75%. In addition, the effects of strain rate, deformation temperature and height reduction on microstructure evolution are discussed in detail, respectively.
AB - Isothermal compression tests of as-cast Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb (TC21) titanium alloy are conducted in the deformation temperature ranging from 1000 to 1150°C with an interval of 50°C, strain rate ranging from 0.01 to 10.0s-1 and height reductions of 30%, 45%, 60% and 75% on a computer controlled Gleeble 3500 simulator. The true stress-strain curves under different deformation conditions are obtained. Based on the experimental data, the effects of deformation parameters on the hot deformation behavior of as-cast TC21 alloy were studied. The deformation mechanisms of the alloy in the whole regimes are predicted by the power dissipation efficiency and instability parameter and further investigated through the microstructure observation. It is found that at the height reductions of 30%, 45% and 60%, the softening of stress-strain curves at high strain rate (>1.0s-1) is mainly associated with flow localization, which is caused by local temperature rise, whereas at low strain rate, the softening is associated with dynamic recrystallization (DRX). However, the instability showed in flow localization occurs at low strain rate of 0.01s-1 when the height reduction reaches 75%. In addition, the effects of strain rate, deformation temperature and height reduction on microstructure evolution are discussed in detail, respectively.
KW - A. Non-ferrous metals and alloys
KW - F. Microstructure
KW - H. Selection of material processes
UR - http://www.scopus.com/inward/record.url?scp=80053933972&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2011.07.018
DO - 10.1016/j.matdes.2011.07.018
M3 - 文章
AN - SCOPUS:80053933972
SN - 0264-1275
VL - 33
SP - 264
EP - 272
JO - Materials and Design
JF - Materials and Design
IS - 1
ER -