Effect of Temperature, Strain and Strain Rate on Efficiency of Power Dissipation during Hot Deformation of Fe-28Ni-17Co-11.5Al-2.5Ta-0.05B (at. %) Shape Memory Alloy Using Taguchi Method

2019 ◽  
Vol 1156 ◽  
pp. 1-9
Author(s):  
S.H. Adarsh ◽  
Vedamanickam Sampath
Keyword(s):  
Shape Memory Alloy ◽  
Taguchi Method ◽  
Strain Rate ◽  
Shape Memory ◽  
Power Dissipation ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Flow Behaviour ◽  
Strain And Strain Rate ◽  
Temperature Strain

Recently a ferrous-based Fe-28Ni-17Co-11.5Al-2.5Ta-0.05B (at.%) shape memory alloy (abbreviated NCATB) has attracted attention because of its huge superelasticity (～13%). In order to manufacture this alloy on a large scale, a deeper knowledge of the plastic deformation behaviour of the alloy is required. During hot deformation, temperature and strain rate exert significant effect on the mechanical properties. The main objective of the work, therefore, is to investigate the influence of deformation parameters, such as temperature, strain rate and strain, on flow behaviour of an NCATB shape memory alloy. Flow behaviour tests on an NCATB alloy were performed on a Gleeble-3800 thermomechanical simulator at deformation temperatures of 1100, 1150 and 1200°C and strain rates of 0.1, 1.0 and 10s-1 with the strains maintained at 0.2, 0.4 and 0.6, respectively. The workpiece is considered asa dissipater of power, and the features of power dissipation will,therfore, be seen as changes in the microstructure. These features of power dissipation are measured by a parameter called efficiency of power dissipation (η). It is directly related to the strain rate sensitivity parameter(m). Taguchi method is used to evaluate the influence of deformation temperature, strain rate and strain on efficiency of power dissipation. Based on the results, optimum parameters for higher efficiency of power dissipation are: 1150°C (temperature), 0.1 s-1 (strain rate) and 0.2 (strain). An analysis of experimental results in terms of percentage contribution reveals that strain rate plays a more predominant role (39.73%) compared to temperature (24.03%) and strain (32.73%) on NCATB alloy.

scholarly journals Hot Deformation Behaviour of Cu/Al Laminated Composites under Interface Constraint Effect

2018 ◽  
Author(s):  
Shuaiyang Liu ◽  
Aiqin Wang ◽  
Tingting Liang ◽  
Jingpei Xie
Keyword(s):  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Laminated Composites ◽  
Deformation Behaviour ◽  
Effect Of Temperature ◽  
Strain Hardening Exponent ◽  
Constraint Effect ◽  
Temperature Strain

In order to understand the hot deformation behavior of novel Cu/Al laminated composites, isothermal hot compression tests were conducted by Gleeble-1500D thermo-mechanical simulator. And the effect of bonding interface, deformation temperature and strain rate on the deformation behavior was analyzed. Results show that under the interface constraint effect, soft Al layer trends to flow synchronously with hard Cu layer. And further microstructure examinations indicate the cooperative deformation capability of Cu/Al composites increases with increasing stain rate and decreasing deformation temperature. Strain hardening exponent, calculated based on the true stress-true strain data, also proves the effect of deformation temperature and strain rate on the cooperative deformation behavior. Meanwhile, unique composites structure allows the Al matrix to exhibit the characteristic of dynamic recrystallization during the hot deformation process. Lastly, strain compensated Arrhenius-type constitutive equation was employed to describe the coupling effect of temperature, strain rate and strain on the flow stress.

scholarly journals Characteristics of Plasticity of Hot Deformed Cu-Ti Alloys/ Charakterystyki Plastyczności Odkształcanych Na Gorąco Stopów Cu-Ti

2014 ◽  
Vol 59 (4) ◽  
pp. 1307-1312 ◽  
Author(s):  
A. Szkliniarz ◽  
L. Blacha ◽  
W. Szkliniarz ◽  
J. Łabaj
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Maximum Flow ◽  
Rate Reduction ◽  
Flow Curves ◽  
Uniform Deformation ◽  
Ti Alloys ◽  
Strain And Strain Rate ◽  
Temperature Strain

Abstract In the paper, results of a study on the effects of deformation conditions (temperature, strain and strain rate) on flow curves, maximum flow stress and corresponding deformation of Cu-Ti alloys with various Ti contents, subjected to hot deformation, are presented. Evaluation of formability of alloys was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator during uniaxial hot compression at 700 to 900°C, strain rate of 0.1 to 10.0 s-1 and strain of 0 to 1.2 (70%). It was found that within the analysed ranges of temperature, strain rate and strain, Cu-Ti alloys underwent uniform deformation without cracking. The largest deformation resistances were observed for the alloys with the highest Ti contents; their decrease was possible with the temperature raise and the strain rate reduction.

Hot Deformation Behavior of TiNiFe Shape Memory Alloy: A Study with Processing Map

2013 ◽  
Vol 631-632 ◽  
pp. 371-376 ◽  
Author(s):  
X.Q. Yin ◽  
S.J. Wang ◽  
Y.F. Li ◽  
B.D. Gao ◽  
X.Y. Kang ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Strain Rate ◽  
Shape Memory ◽  
Deformation Temperature ◽  
Processing Map ◽  
Material Model ◽  
Dynamic Material Model ◽  
Back Scattering ◽  
Instability Regions ◽  
Gleeble 3500

Isothermal compression of the TiNiFe shape memory alloy has been carried out on a Gleeble-3500 thermal simulation machine at the deformation temperature ranging from 1023K to 1323K, the strain rate ranging from 0.01s-1 to 10s-1 with total strain of 0.8. On the basis of dynamic material model, the processing map is established with two instability regions and a desirable domain which demonstrate optimum hot working conditions within the experimental parameters. By means of Electron Back Scattering Diffraction, we come to the conclusion that both dynamic recovery and dynamic recrystallization exist in the desirable domain with deformation temperature ranging 1123 K and strain rate 0.1s-1. The uneven deformation exits in the low deformation temperature with high strain rate area, such as 1023 K and10 s-1. And with 1323K and 0.01s-1 strain rate, the recrystallized grains are abnormal grow up.

scholarly journals Hot Deformation Behavior and Microstructural Evolution of PM Ti43Al9V0.3Y with Fine Equiaxed γ and B2 Grain Microstructure

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 896
Author(s):  
Dongdong Zhang ◽  
Yuyong Chen ◽  
Guoqing Zhang ◽  
Na Liu ◽  
Fantao Kong ◽  
...  
Keyword(s):  
Strain Rate ◽  
Microstructure Evolution ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Working ◽  
Boundary Slip ◽  
Hot Deformation Behavior ◽  
Strain And Strain Rate ◽  
Working Parameters ◽  
Temperature Strain

The hot deformation behavior and microstructure evolution of powder metallurgy (PM) Ti43Al9V0.3Y alloy with fine equiaxed γ and B2 grains were investigated using uniaxial hot compression. Its stress exponent and activation energy were 2.78 and 295.86 kJ/mol, respectively. The efficiency of power dissipation and instability parameters were evaluated, and processing maps at 50% and 80% strains were developed. It is demonstrated that the microstructure evolution was dependent on the temperature, strain, and strain rate. Both temperature and strain increases led to a decrease in the γ phase. Moreover, dynamic recrystallization (DRX) and grain boundary slip both played important roles in deformation. Reasonable parameters for secondary hot working included temperatures above 1100 °C but below 1200 °C with a strain rate of less than 1 s−1 at 80% strain. Suitable hot working parameters at 50% strain were 1150–1200 °C/≤1 s−1 and 1000–1200 °C/≤0.05 s−1.

Austenite Recrystallization Model of High Ti Microalloyed Steels

2014 ◽  
Vol 1014 ◽  
pp. 25-32
Author(s):  
Xue Gang Xiong
Keyword(s):  
Strain Rate ◽  
Deformation Temperature ◽  
Microalloyed Steels ◽  
Kinetics Equation ◽  
Simulation Test ◽  
Recrystallization Kinetics ◽  
Strain And Strain Rate ◽  
Test Steel ◽  
Austenite Recrystallization ◽  
Temperature Strain

Through the thermal simulation test, the curves of austenite recrystallization kinetics is recorded, the influence of the parameters including deformation temperature, strain and strain rate on the austenite recrystallization fraction of Ti microalloyed steels is studied, the recrystallization kinetics equation is calculated, and the austenite recrystallization model of the test steel is obtained. The results improve that Ti inhibits both the dynamic and static austenite recrystallization in high Ti microalloyed steels.

scholarly journals Effect of Aspect Ratio and Boundary Conditions in Modeling Shape Memory Alloy Nanostructures with 3D Coupled Dynamic Phase-Field Theories

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
R. Dhote ◽  
H. Gomez ◽  
R. Melnik ◽  
J. Zu
Keyword(s):  
Aspect Ratio ◽  
Shape Memory Alloy ◽  
Boundary Conditions ◽  
Strain Rate ◽  
Shape Memory ◽  
Phase Transformations ◽  
Phase Field ◽  
High Yield ◽  
Complete Disappearance ◽  
Strain And Strain Rate

The behavior of shape memory alloy (SMA) nanostructures is influenced by strain rate and temperature evolution during dynamic loading. The coupling between temperature, strain, and strain rate is essential to capture inherent thermomechanical behavior in SMAs. In this paper, we propose a new 3D phase-field model that accounts for two-way coupling between mechanical and thermal physics. We use the strain-based Ginzburg-Landau potential for cubic-to-tetragonal phase transformations. The variational formulation of the developed model is implemented in the isogeometric analysis framework to overcome numerical challenges. We have observed a complete disappearance of the out-of-plane martensitic variant in a very high aspect ratio SMA domain as well as the presence of three variants in equal portions in a low aspect ratio SMA domain. The dependence of different boundary conditions on the microstructure morphology has been examined energetically. The tensile tests on rectangular prism nanowires, using the displacement based loading, demonstrate the shape memory effect and pseudoelastic behavior. We have also observed that higher strain rates, as well as the lower aspect ratio domains, resulting in high yield stress and phase transformations occur at higher stress during dynamic axial loading.

Study on Hot Deformation Behavior of TiNiFe Shape Memory Alloy

2011 ◽  
Vol 393-395 ◽  
pp. 312-318
Author(s):  
Qiang Liu ◽  
Xiang Qian Yin ◽  
Bo Duan ◽  
Sheng Ying Shong ◽  
Yao Rong Feng
Keyword(s):  
Shape Memory Alloy ◽  
Strain Rate ◽  
Shape Memory ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Linear Regression Analysis ◽  
Hot Compression ◽  
Hot Deformation Behavior ◽  
Hot Compression Deformation ◽  
Compression Deformation

The hot deformation behavior of TiNiFe shape memory alloy were investigated by isothermal single-pass compression on Gleeble-3500 thermal simulator at the temperature range of 800°C to 1050°C and the strain rate range of 0.01s-1 to 10s-1. The results showed that the true stress-strain curves of TiNiFe shape memory alloy increase with decreasing deformation temperature and increasing strain rate, which indicating that the hot deformations of these conditions are dynamic recrystallization. The hot compression deformation of TiNiFe shape memory alloy can be represented by Arrhenius model. The constitutive equation of TiNiFe shape memory alloy under hot compression deformation is calculated by a linear regression analysis. The activation energy for hot deformation of the experimental steel is 202.54kJ/mol.

Rate-Dependent Damping Capacity of NiTi Shape Memory Alloy

2011 ◽  
Vol 172-174 ◽  
pp. 37-42 ◽  
Author(s):  
Yong Jun He ◽  
Qing Ping Sun
Keyword(s):  
Shape Memory Alloy ◽  
Strain Rate ◽  
Shape Memory ◽  
Strain Curve ◽  
Tensile Loading ◽  
Niti Shape Memory Alloy ◽  
Damping Capacity ◽  
Environmental Condition ◽  
Mechanical Coupling ◽  
Rate Dependent

High damping capacity is one of the prominent properties of NiTi shape memory alloy (SMA), having applications in many engineering devices to reduce unwanted vibrations. Recent experiments demonstrated that, the hysteresis loop of the stress-strain curve of a NiTi strip/wire under a tensile loading-unloading cycle changed non-monotonically with the loading rate, i.e., a maximum damping capacity was obtained at an intermediate strain rate (ε.critical). This rate dependence is due to the coupling between the temperature dependence of material’s transformation stresses, latent-heat release/absorption in the forward/reverse phase transition and the associated heat exchange between the specimen and the environment. In this paper, a simple analytical model was developed to quantify these thermo-mechanical coupling effects on the damping capacity of the NiTi strips/wires under the tensile loading-unloading cycle. We found that, besides the material thermal/mechanical properties and specimen geometry, environmental condition also affects the damping capacity; and the critical strain rate ε.criticalfor achieving a maximum damping capacity can be changed by varying the environmental condition. The theoretical predictions agree quantitatively with the experiments.

scholarly journals Hot Deformation Behaviour and Processing Map of Cast Alloy 825

2021 ◽  
Author(s):  
Munir Al-Saadi ◽  
Christopher Hulme-Smith ◽  
Fredrik Sandberg ◽  
Pär G. Jönsson
Keyword(s):  
Strain Rate ◽  
Vickers Hardness ◽  
Power Dissipation ◽  
Hot Deformation ◽  
Processing Map ◽  
Cast Alloy ◽  
True Strain ◽  
Processing Conditions ◽  
Temperature Range ◽  
Power Dissipation Efficiency

AbstractAlloy 825 is a nickel-based alloy that is commonly used in applications where both high strength and corrosion resistance are required, such as tanks in the chemical, food and petrochemical industries and oil and gas pipelines. Components made from Alloy 825 are often manufactured using hot deformation. However, there is no systematic study to optimise the processing conditions reported in literature. In this study, a processing map for as-cast Alloy 825 is established to maximise the power dissipation efficiency of hot deformation in the temperature range of 950 to 1250 °C at an interval of 50 °C and strain rate range of $$0.01\, {\text{s}}^{ - 1}$$ 0.01 s - 1 to $$10.0\, {\text{s}}^{ - 1}$$ 10.0 s - 1 to a true strain of $$0.7$$ 0.7 using a Gleeble-3500 thermomechanical simulator. The processing conditions are also correlated to the Vickers hardness of the final material, which is also characterised using optical microscopy and scanning electron microscopy, including electron backscattered diffraction. The true stress-true strain curves exhibit peak stresses followed by softening due to occurrence of dynamic recrystallization. The activation energy for plastic flow in the temperature range tested is approximately $$450\,{\text{ kJ mol}}^{ - 1}$$ 450 kJ mol - 1 , and the value of the stress exponent in the (hyperbolic sine-based) constitutive equation, $$n = 5.0$$ n = 5.0 , suggests that the rate-limiting mechanism of deformation is dislocation climb. Increasing deformation temperature led to a lower Vickers hardness in the deformed material, due to increased dynamic recrystallization. Raising the strain rate led to an increase in Vickers hardness in the deformed material due to increased work hardening. The maximum power dissipation efficiency is over $$35\%$$ 35 % , obtained for deformation in the temperature range 1100-1250 °C and a strain rate of $$0.01\, {\text{s}}^{ - 1}$$ 0.01 s - 1 -$$0.1\, {\text{s}}^{ - 1}$$ 0.1 s - 1 . These are the optimum conditions for hot working.

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