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Stephen Yue - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering: A, 2003Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900\u20131050 \ub0C using strain rates of 0.01, 0.1 and 1 s\u22121. Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener\u2013Hollomon relationship.Peer reviewed: NoNRC publication: Ye
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2002Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Abstract Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900–1050 °C using strain rates of 0.01, 0.1 and 1 s −1 . Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener–Hollomon relationship.
A.m. Elwazri - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering: A, 2003Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900\u20131050 \ub0C using strain rates of 0.01, 0.1 and 1 s\u22121. Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener\u2013Hollomon relationship.Peer reviewed: NoNRC publication: Ye
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2002Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Abstract Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900–1050 °C using strain rates of 0.01, 0.1 and 1 s −1 . Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener–Hollomon relationship.
P. Wanjara - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering: A, 2003Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900\u20131050 \ub0C using strain rates of 0.01, 0.1 and 1 s\u22121. Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener\u2013Hollomon relationship.Peer reviewed: NoNRC publication: Ye
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Dynamic Recrystallization of austenite in microalloyed high carbon steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2002Co-Authors: A.m. Elwazri, P. Wanjara, Stephen YueAbstract:Abstract Hypereutectoid steels of 1% carbon, alloyed with high silicon and microalloying levels of vanadium were subjected to Dynamic Recrystallization. It was found that an increase in carbon and vanadium content leads to smaller grain size. To characterize the Dynamic Recrystallization behavior of these steels, compression tests were performed over the temperature range 900–1050 °C using strain rates of 0.01, 0.1 and 1 s −1 . Equations were generated that can be used to predict the critical strain for Dynamic Recrystallization. Of interest is the finding that there is an activation energy for deformation specifically associated with Dynamic Recrystallization (i.e. peak strain). This activation energy associated with the peak strain is lower than that associated with the steady state stress. This is contrary to Sellar's original observation that the peak strain is a function of the activation energy for deformation according to the Zener–Hollomon relationship.
Yanqiu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Dynamic Recrystallization of NiTi Shape Memory Alloy Subjected to Local Canning Compression
Metals, 2017Co-Authors: Yanqiu Zhang, Shuyong Jiang, Li HuAbstract:Physical mechanism for Dynamic Recrystallization of NiTi shape memory alloy subjected to local canning compression at various temperatures, 600, 700 and 800 °C, was investigated via electron backscattered diffraction experiments and transmission electron microscopy observations. With increasing deformation temperature, fractions of recrystallized grains and substructures increase, whereas fraction of deformed grains decreases. In the case of 600 and 700 °C, continuous Dynamic Recrystallization and discontinuous Dynamic Recrystallization coexist in NiTi shape memory alloy. In the case of discontinuous Dynamic Recrystallization, the recrystallized grains are found to be nucleated at grain boundaries and even in grain interior. The pile-up of statistically stored dislocation lays the foundation for the nucleation of the recrystallized grains during discontinuous Dynamic Recrystallization of NiTi shape memory alloy. Geometrically necessary dislocation plays as an important role in the formation of new recrystallized grains during continuous Dynamic Recrystallization of NiTi shape memory alloy.
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Dynamic recovery and Dynamic Recrystallization of niti shape memory alloy under hot compression deformation
Transactions of Nonferrous Metals Society of China, 2013Co-Authors: Shuyong Jiang, Yanqiu Zhang, Yanan ZhaoAbstract:Abstract Mechanical behavior of nickel–titanium shape memory alloy (NiTi SMA) under hot deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001–1 s −1 and at the temperatures of 600–1000 °C. Dynamic recovery and Dynamic Recrystallization of NiTi SMA were systematically investigated by microstructural evolution. The influence of the strain rates, the deformation temperatures and the deformation degree on the Dynamic recovery and Dynamic Recrystallization of NiTi SMA was obtained as well. NiTi SMA was characterized by the combination of Dynamic recovery and Dynamic Recrystallization at 600 °C and 700 °C, but the complete Dynamic Recrystallization occurred at other deformation temperatures. Increasing the deformation temperatures or decreasing the stain rates leads to larger equiaxed grains. The deformation degree has an important influence on the Dynamic Recrystallization of NiTi SMA. There exists the critical deformation degree during the Dynamic Recrystallization of NiTi SMA, beyond which the larger deformation degree contributes to obtaining the finer equiaxed grains.
Minghe Zhang - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Recrystallization behavior of a medium carbon vanadium microalloyed steel
Materials Science and Engineering: A, 2013Co-Authors: Hai-lian Wei, Guoquan Liu, Xiang Xiao, Minghe ZhangAbstract:Abstract The Dynamic Recrystallization behavior of a medium carbon vanadium microalloyed steel was systematically investigated at the temperatures from 900 °C to 1100 °C and strain rates from 0.01 s −1 to 10 s −1 on a Gleeble-1500 thermo-simulation machine. The flow stress constitutive equation of hot deformation for this steel was developed with the activation energy Q being about 273 kJ/mol, which is in reasonable agreement with those reported before. Activation energy analysis showed that vanadium addition in microalloyed steels seemed not to affect the activation energy much. The effect of Zener–Hollomon parameter on the characteristic points of flow curves was studied using the power law relation, and the dependence of critical strain (stress) on peak strain (stress) obeyed a linear equation. Dynamic Recrystallization is the most important softening mechanism for the experimental steel during hot compression. The Dynamic Recrystallization kinetics model of this steel was established based on flow stress and a frequently-used Dynamic Recrystallization kinetics equation. Dynamic Recrystallization microstructure under different deformation conditions was also observed and the dependence of steady-state grain size on the Zener–Hollomon parameter was plotted.
