Dynamic Recrystallization Behavior of Microalloyed 3.5Ni Steel

2010 ◽  
Vol 146-147 ◽  
pp. 1889-1893
Author(s):  
Jian Hua Li ◽  
Tian Hui Xi ◽  
Xiao Chen ◽  
Kai Ming Wu
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Critical Conditions ◽  
Recrystallization Behavior ◽  
Isothermal Compression ◽  
Compression Deformation ◽  
Dynamic Recrystallization Behavior ◽  
Gleeble 3500

Both the critical conditions and evolution of dynamic recrystallization behavior for a Nb-Ti microalloyed 3.5Ni steel were carried out by isothermal compression deformation on a Gleeble-3500 thermal simulator. Results show that the critical conditions of dynamic recrystallization behavior deformation of 30 % at 1050 °C, and the accumulative deformation for full dynamic recrystallization is 50 % at a strain rate of 1 /s. Accordingly, proposals on how to roll 3.5Ni steel were made.

Dynamic Recrystallization Behavior of Mg-Gd-Y-Zr Alloy during Hot Compression

2016 ◽  
Vol 849 ◽  
pp. 181-185 ◽  
Author(s):  
Shi Lun Yu ◽  
Yong Hao Gao ◽  
Chu Ming Liu ◽  
Hong Chao Xiao
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Volume Fraction ◽  
Peak Stress ◽  
Critical Conditions ◽  
Recrystallization Behavior ◽  
Compression Tests ◽  
Dynamic Recrystallization Behavior ◽  
Increasing Temperature ◽  
The Cost

Dynamic recrystallization behavior of Mg-8.0Gd-3.0Y-0.5Zr (wt.%) alloy and the critical conditions corresponding to the onset of dynamic recrystallization were investigated using uniaxial compression tests conducted at temperatures ranging from 350 °C to 500 °C and strain rates ranging from 0.001 s-1 to 1 s-1. Results show that increasing temperature and/or decreasing strain rate can enhance the process of dynamic recrystallization of Mg-8.0Gd-3.0Y-0.5Zr alloy and lower the peak stress and corresponding strain. However, decreasing temperature and/or increasing strain rate can promote the occurrence of twin dynamic recrystallization (TDRX) within the original grains at the cost of reducing the total volume fraction of dynamically recrystallized grains in the microstructure. Besides, the critical stress and strain corresponding to the onset of dynamic recrystallization of Mg-8.0Gd-3.0Y-0.5Zr at 400 °C and 0.1 s-1 are 173MPa and 0.13, respectively.

Microstructure Prediction of 316LN Stainless Steel for Dynamic Recrystallization Based on Cellular Automata

2016 ◽  
Vol 693 ◽  
pp. 674-679
Author(s):  
Hai Peng Ji ◽  
Li Ge Zhang ◽  
Jing Liu ◽  
Tai Yong Wang
Keyword(s):  
Cellular Automata ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Deformation Temperature ◽  
Recrystallization Behavior ◽  
Cellular Automata Model ◽  
Dynamic Recrystallization Behavior ◽  
Microstructure Prediction ◽  
Gleeble 3500 ◽  
Hot Compress

The established cellular automata model of dynamic recrystallization for 316LN simulated microstructure evolution of recrystallization nucleation and grain growth under different conditions. And on the basis of cellular automata model, the influence of strain, strain rate, deformation temperature on dynamic recrystallization behavior was analyzed. Though the hot compress experiment done on the Gleeble-3500 thermo mechanical simulator, combined with metallographic experiment, the microstructure at deformation temperature of 950 oC, 1050 oC and 1150 oC with strain rate of 0.001 s-1, 0.01 s-1, 0.1 s-1 and 1 s-1 was obtained. Simulation results are compared with metallographic microstructure, the error is small.

Hot Deformation Behavior of TC21 Alloy

2013 ◽  
Vol 446-447 ◽  
pp. 117-121
Author(s):  
Hai Lin Xu ◽  
Hong Bo Dong ◽  
Yong Wang
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Dynamic Recovery ◽  
Recrystallization Behavior ◽  
Hot Deformation Behavior ◽  
Dynamic Recrystallization Behavior ◽  
Set Up ◽  
Gleeble 3500

The dynamic recrystallization behavior of TC21 alloy during hot compression deformation was investigated at 870~990 °C and strain rate of 0.001~10 s-1 on a Gleeble-3500 thermo-simulation machine. The results show that dynamic recovery and dynamic recrystallization occurs during hot deformation. As the deformation temperature increases and strain rate decreases, the softening caused by dynamic recrystallization is more obvious. According to the relevance of flow stress, strain rate and deformation temperature, the dynamic recrystallization activation energy is obtained. The constitutive equation and dynamic recrystallization kinetics motel are set up through analyzing and calculating the data of thermo-simulation.

scholarly journals Dynamic recrystallization behavior of the Ta-containing TiAl alloy in isothermal deformation

2020 ◽  
Vol 321 ◽  
pp. 12008
Author(s):  
Y.Y. Luo ◽  
X.N. Mao ◽  
H.Y. Yang ◽  
Y.F. Yin ◽  
Z.Z. Zhao ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Tial Alloy ◽  
Grain Boundary Sliding ◽  
Strain Rates ◽  
Recrystallization Behavior ◽  
Compression Process ◽  
Dynamic Recrystallization Behavior ◽  
Boundary Sliding ◽  
Mechanical Twins

The dynamic recrystallization behavior of as-cast Ti-46.5Al-3Ta-2Cr-0.2W alloy during isothermal compression process with nominal deformation of 50% and strain rates from 0.01s to 1s was investigated by electron microscopy. The results showed that the deformation mechanism of this alloy can be concluded as grain boundary sliding and mechanical twins, which induce the final dynamic recrystallization. The phase boundary bulging was found to be the major nucleation mechanism responsible for the lamellar globularization and the formation of recrystallized γ grains inside the lamellar colony under the high strain rate. The recrystallized γ grains induced by the twinning is the main mechanism for refining α2 lamellar microstructures under low strain rate.

Effect of Deformation Conditions on Dynamic Recrystallization of As-Cast GH625 Alloy

2015 ◽  
Vol 816 ◽  
pp. 620-627
Author(s):  
Hao Yu Wang ◽  
Jian Xin Dong ◽  
Mai Cang Zhang ◽  
Lei Zheng ◽  
Zhi Hao Yao ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Process Design ◽  
Deformation Process ◽  
Strain Rates ◽  
Recrystallization Behavior ◽  
Compression Tests ◽  
Volume Percent ◽  
Dynamic Recrystallization Behavior ◽  
Continuous Recrystallization

High temperature compression tests at a deformation temperature range of 1273K~1473K with various strain rates of 0.01s-1~0.1s-1 on as-cast GH625 alloy were carried out, aiming at the current research status that the deformation process of cogging and the recrystallization behavior of ingot are still in the study. The results indicated that the recrystallization nuclei of ingot formed not only along the original grain boundaries, but also in the interdendrite. Dynamic recrystallization volume percent increased with the increase of temperature and the decrease of strain rate. When the temperature was high and strain rate was low, the dynamic recrystallization behavior of as-cast GH625 alloy was dominated by discontinuous recrystallization. However, when the temperature was low and strain rate was high, continuous recrystallization also existed. These results can provide some reliable experimental support for the cogging process design.

scholarly journals Simulation of Dynamic Recrystallization Behavior under Hot Isothermal Compressions for as-extruded 3Cr20Ni10W2 Heat-Resistant Alloy by Cellular Automaton Model

2018 ◽  
Vol 37 (7) ◽  
pp. 635-647 ◽  
Author(s):  
Le Li ◽  
Li-yong Wang
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Cellular Automaton ◽  
Deformation Temperature ◽  
Experimental Result ◽  
Recrystallization Behavior ◽  
Dynamic Recrystallization Behavior ◽  
Ca Model ◽  
Recrystallized Grain Size

AbstractIn order to study dynamic recrystallization behavior of the as-extruded 3Cr20Ni10W2 under isothermal compression conditions, a cellular automaton (CA) model was applied to simulate hot compression. Analysis on the strain–stress curves indicates that dynamic recrystallization is the main softening mechanism for the 3Cr20Ni10W2 when the deformation occurred in the temperature range of 1203–1303 K with an interval of 50 K and strain rate range of 0.01–10 s−1. The deformation temperature and strain rate have a significant influence on the dynamically recrystallized grain size. Subsequently, a CA model is established to simulate the dynamic recrystallization behaviors of the studied alloy. The simulated results show that the mean grain size increases with the increased deformation temperature and decreases with the increased strain rate, which is consistent with the experimental result. In addition, the average absolute relative error, which is 13.14%, indicates that the process of the dynamic recrystallization and the dynamically recrystallized grain size can be well predicted by the present CA model.

Study on Dynamic Recrystallization Behavior of Cu-Ni-Si Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 701-704
Author(s):  
Yi Zhang ◽  
Bao Hong Tian ◽  
Ping Liu ◽  
Shu Guo Jia ◽  
Li Fan ◽  
...  
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Dynamic Recovery ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Recrystallization Behavior ◽  
Isothermal Compression ◽  
Compression Tests ◽  
Deformation Equation ◽  
Dynamic Recrystallization Behavior

The flow stress behavior of Cu-2.0Ni-0.5Si alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500D thermal-mechanical simulator.Dynamic recrystallization and dynamic recovery during high temperature deformation have been investigated by means of compression tests in the temperature and strain rate ranges of 873 to 1073 K and 0.01 to 5s-1 under maxium strain of 60%. The results show the flow stress was controlled by both strain rate and deforming temperature,the flow stress decreases with the increase of deforming temperature,while increases with the increase of strain rate.The hot deformation equation is e& = e28.47[sinh(0.013s )]5.52 exp(-245.4´103 / RT ) .

Thermal Deformation Behavior and Critical Conditions of Dynamic Recrystallization of QCr0.8 Alloy

2019 ◽  
Vol 944 ◽  
pp. 38-45
Author(s):  
Shu Yu Yang ◽  
Qiang Song Wang ◽  
Guo Liang Xie ◽  
Dong Mei Liu ◽  
Fang Liu
Keyword(s):  
Constitutive Equation ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Thermal Deformation ◽  
Processing Map ◽  
Critical Conditions ◽  
Temperature Deformation ◽  
Thermal Compression ◽  
Compression Deformation

In this paper, the flow stresses, the constitutive equation, processing map and the critical conditions of dynamic recrystallization (DRX) of the hot forged QCr0.8 alloy are studied by hot compressive test in the 750-900°C temperature and 0.01-10s-1 strain rate ranges using Gleeble-1500D thermo-mechanical simulator. The compression reduction of thermal compression deformation is 50%. The results show that the thermal deformation temperatures and strain rates have a significant effect on the high temperature deformation behavior of the alloy. The higher the temperature, the smaller the strain rate and the easier the DRX of the alloy is found.The peak stresses of the alloy decreases with the increase of temperature and increases with the increase of the strain rates.The flow stresses during hot deformation can be described by a hyperbolic sine function. The activation energy Q of the thermal compression deformation is determined to be 370.8KJ/mol. The constitutive equation and processing map of the alloy are established. Critical strains of DRX εc are studied by the inflection point characteristic of the lnθ-ε curve of the alloy and the corresponding minimum value of the ∂θ (∂θ)/∂ε-ε curve.

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