Hot deformation behavior of Mg-4Li-1Al alloy via hot compression tests

2016 ◽  
Vol 688 ◽  
pp. 1058-1065 ◽  
Author(s):  
Seyed Alireza Askariani ◽  
Seyed Mohammad Hasan Pishbin
Keyword(s):  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Compression ◽  
Compression Tests ◽  
Hot Deformation Behavior

scholarly journals Characterization of Hot Deformation Behavior in a 13% Chromium Steel

2018 ◽  
Vol 941 ◽  
pp. 458-467
Author(s):  
Nima Safara Nosar ◽  
Fredrik Sandberg ◽  
Göran Engberg
Keyword(s):  
Hot Deformation ◽  
Deformation Behavior ◽  
Peak Stress ◽  
Chromium Steel ◽  
Hot Compression ◽  
Strain Rates ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Hollomon Parameter

The behavior of a 13% chromium steel subjected to hot deformation has been studied by performing hot compression tests in the temperature range of 850 to 12000C and at strain rates from 0.01 to 10 s-1. The uniaxial hot compression tests were performed on a Gleeble thermo-mechanical simulator. The best function that fits the peak stress for the material and its relation to the Zener-Hollomon parameter (Z) is derived. The average activation energy of this alloy in the entire test domain was found to be about 557 [kJmol-1] and the dynamic recrystallization (DRX) kinetics was studied to find the fraction DRX during deformation.

Hot Deformation Behavior during the Hot Compression of AZ31 Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 545-548 ◽  
Author(s):  
Shu Li Sun ◽  
Min Gang Zhang ◽  
Wen Wu He ◽  
Jun Qi Zhou ◽  
Gang Sun
Keyword(s):  
Hot Deformation ◽  
Deformation Behavior ◽  
Flow Instability ◽  
Strain Curve ◽  
Az31 Alloy ◽  
Hot Compression ◽  
Instability Criterion ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Hollomon Parameter

The hot deformation behavior of as-cast AZ31 magnesium alloys have been investigated at 200~400°C and strain rates 0.001~1s-1 by means of hot compression tests on a Gleeble-1500D thermal-mechanical simulator. We have analyzed the flow stress-strain curve and presented the constitutive equation by calculating stress exponent, activation energy and Zemer-Hollomon parameter. Then, the processing map of AZ31 alloys has been developed based on the dynamic material model theories and Prasad instability criterion. The flow instability domain is observed at lower temperature and the larger power dissipation rate is emerging at 300~400°C. We have analyzed the corresponding deformation microstructures and it is characteristic of dynamic recrystallization. These results have shown that AZ31 alloy has good workability at 300~400°C and lower strain rate.

scholarly journals Hot Deformation Behavior of PM Ni with Harmonic Microstructure

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 90
Author(s):  
Cinzia Menapace ◽  
Bhupendra Sharma ◽  
Kei Ameyama
Keyword(s):  
Hot Deformation ◽  
Deformation Behavior ◽  
Rate Sensitivity ◽  
Hot Compression ◽  
Metallographic Analysis ◽  
Diffusion Creep ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Temperature Spectrum ◽  
Wide Range

The hot deformation behavior of a harmonic-structured pure nickel has been studied and compared with the hot deformability of a homogeneously structured nickel. Both materials were produced via the powder metallurgy route through the Spark Plasma Sintering (SPS) of mechanical milled and un-milled powders. Hot deformation was evaluated through compression tests at three different temperatures (400 °C, 800 °C, and 1300 °C), covering a wide range in the homologous temperature spectrum for Ni (from 0.39 to 0.91), and at three different strain rates (0.001, 0.01, and 0.1 s−1). The evaluation of the stress–strain curves showed a higher hot compression resistance for the harmonic-structured nickel, together with higher strain hardening and strain rate sensitivity, thanks to the peculiar microstructural features of this material. Through the metallographic analysis of the specimens after hot compression, different mechanisms were identified as responsible for the deformation behavior in relation to the temperature of testing. While at 400 °C dynamic recrystallization has slightly started, at 800 °C it is widely diffused, and at 1300 °C it is replaced by grain growth and diffusion creep phenomena.

scholarly journals Hot Deformation Behavior Considering Strain Effects and Recrystallization Mechanism of an Al-Zn-Mg-Cu Alloy

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1743 ◽  
Author(s):  
Lei Luo ◽  
Zhiyi Liu ◽  
Song Bai ◽  
Juangang Zhao ◽  
Diping Zeng ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Processing Parameters ◽  
Strain Rate Range ◽  
Hot Compression ◽  
Processing Maps ◽  
Hot Deformation Behavior ◽  
Recrystallization Mechanism ◽  
Cu Alloy

The hot deformation behavior of an Al-Zn-Mg-Cu alloy was investigated by hot compression test at deformation temperatures varying from 320 to 440 °C with strain rates ranging from 0.01 to 10 s−1. The results show that the Mg(Zn, Cu)2 particles as a result of the sufficient static precipitation prior to hot compression have an influence on flow softening. A constitutive model compensated with strain was developed from the experimental results, and it proved to be accurate for predicting the hot deformation behavior. Processing maps at various strains were established. The microstructural evolution demonstrates that the dominant dynamic softening mechanism stems from dynamic recovery (DRV) and partial dynamic recrystallization (DRX). The recrystallization mechanism is continuous dynamic recrystallization (CDRX). The microstructure observations are in good agreement with the results of processing maps. On account of the processing map and microstructural observation, the optimal hot processing parameters at a strain of 0.6 are at deformation temperature range of 390–440 °C and strain rate range of 0.010–0.316 s−1 with a peak efficiency of 0.390.

Hot Deformation Behavior and Microstructure of U720Li Alloy

2013 ◽  
Vol 709 ◽  
pp. 143-147 ◽  
Author(s):  
Tao Wang ◽  
Zhao Li ◽  
Shu Hong Fu ◽  
Yong Zhang ◽  
Yu Xin Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Primary Phase ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Fine Grain ◽  
Lower Strain

The hot deformation behavior of U720Li was investigated by isothermal compression tests at temperature ranging from 1060-1180°C and strain rate from 0.001s-1 to 20s-1. The flow stress-strain curves and microstructures were investigated and a constitutive equation was established. It is found that flow stress is sensitive to stain rate and deformation temperature greatly. The higher stain rate resultes in a larger fluctuation in flow stress. The hot deformation activation energy is determined to be 552.8kJ/mol. Grain size increases with increasing temperature and decreases firstly and then increases with increasing strain rate. U720Li alloy should be deformed below the solve temperature of γ primary phase with lower strain rate in order to obtain the even and fine grain size.

scholarly journals Hot deformation behavior of TC18 titanium alloy

2013 ◽  
Vol 17 (5) ◽  
pp. 1523-1528
Author(s):  
Bao-Hua Jia ◽  
Wei-Dong Song ◽  
Hui-Ping Tang ◽  
Jian-Guo Ning
Keyword(s):  
Titanium Alloy ◽  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
True Strain ◽  
Testing Machine ◽  
Constitutive Relationship ◽  
Compression Tests ◽  
Hot Deformation Behavior

Isothermal compression tests of TC18 titanium alloy at the deformation temperatures ranging from 25?C to 800?C and strain rate ranging from 10-4 to 10-2 s-1 were conducted by using a WDW-300 electronic universal testing machine. The hot deformation behavior of TC18 was characterized based on an analysis of the true stress-true strain curves of TC18 titanium alloy. The curves show that the flow stress increases with increasing the strain rate and decreases with increasing the temperature, and the strain rate play an important role in the flow stress when increasing the temperatures. By taking the effect of strain into account, an improved constitutive relationship was proposed based on the Arrhenius equation. By comparison with the experimental results, the model prediction agreed well with the experimental data, which demonstrated the established constitutive relationship was reliable and can be used to predict the hot deformation behavior of TC18 titanium alloy.

High Temperature Deformation Behavior and Dynamic Recrystallization Law of 33Mn2V Steel for Oil Well Tube

2014 ◽  
Vol 511-512 ◽  
pp. 63-69
Author(s):  
Rui Jia ◽  
Fu Zhong Wang
Keyword(s):  
Dynamic Recrystallization ◽  
Deformation Behavior ◽  
Hot Compression ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Oil Well ◽  
Strain Rates ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Activation Energy Of Deformation

Deformation behavior of steel 33Μn2v for oil well tube was studied by hot compression tests conducted at various temperatures and strain rates.The Kumar model was developed to predict the hot deformation behavior of steel 33Mn2V for oil well tube.In this regard,the hot compression tests were carried out at the temperatures from 750°C to 1200°C and at the strain rates of 0.02s1 to 0.16 s1.The experimental data were then used to determine the constants of developed constitutive equations. The Kumar model can be represented by ZenerHollomon parameter in a hyperbolic sinusoidal equation form.The apparent activation energy of deformation is calculated to be 342.1481kJ/Mol.Dynamic recrystallization of steel 33Mn2V occur and the completion of the critical deformation is small,termination error and the initial deformation is smaller.Therefore,its easy for the steel 33Mn2V to the occurrence and completion of dynamic recrystallization.

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