A Calculation Method of m Based on Processing Map

2011 ◽  
Vol 337 ◽  
pp. 328-331
Author(s):  
Qing Hua Yuan ◽  
Kun Lei ◽  
Zong Ke Shao ◽  
Zhong Guo Huang ◽  
Yu Zhou
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Processing Map ◽  
Flow Instability ◽  
Constant Strain Rate ◽  
Rate Sensitivity ◽  
Instability Region ◽  
High Temperature Tensile ◽  
Good Workability ◽  
High Temperature Tensile Properties

High temperature tensile properties of Ti-4Al-6V material were obtained through high temperature tensile test, and processing maps of the material were drawn by Matlab, then strain rate sensitivity exponent m was calculated. The value of m obtained through constant strain rate stretching method was compared to the former. The results showed that processing map could not only predict the good workability region and flow instability region but also calculate the value of m accurately.

High Temperature Tensile Properties of Mg-5Li-3Al-1.5Zn-2RE Alloys

2012 ◽  
Vol 182-183 ◽  
pp. 189-193
Author(s):  
Ting Qu Li ◽  
M. Gao ◽  
S.H. Wang ◽  
Zhan Yi Cao
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Tensile Properties ◽  
Deformation Mechanism ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Fracture Elongation ◽  
Dominant Deformation Mechanism ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

In this paper, the high temperature tensile properties of the LAZ532-2RE alloy prepared by hot extruded processing after vacuum casting was investaged. The tensile properties of the extruded LAZ532-2RE alloy specimens were tested at different temperature with different strain rate. The microstructures near the fractured surfaces were observed using microscope in order to investigate the dominant deformation mechanism. The activation energy was calculated to explain the high temperature deformation mechanism. The result indicated that the strength of LAZ532-2RE alloy was high at the temperature range from 398K to 423K. Meanwhile, the fracture elongation of the alloy reaches 121% at 523K under strain rate 1×10-3s-1.

Constitutive Equation and Hot Processing Map for Tensile Test of Mg-13Gd-4Y-2Zn-0.5Zr Alloy at Elevated Temperature

2020 ◽  
Vol 993 ◽  
pp. 237-247
Author(s):  
Bei Bei Dong ◽  
Zhi Min Zhang ◽  
Jian Min Yu ◽  
Xin Che ◽  
Shao Bo Cheng
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Deformation Temperature ◽  
Processing Map ◽  
Peak Stress ◽  
Material Model ◽  
Maximum Error ◽  
Tensile Tests ◽  
Hot Processing Map ◽  
High Temperature Tensile

The high temperature tensile behavior of Mg-13Gd-4Y-2Zn-0.5Zr alloy was investigated at deformation temperature of 400-520 °C and strain rate of 0.001-0.5 s-1, and the stress-strain curves were obtained by using INSTRON 3382. The high temperature tensile constitutive model and hot processing map of the alloy were established, and the reliability of the hot processing map was further verified by analyzing the microstructure of the deformed alloy. The results showed that the dynamic recrystallization (DRX) occurred of Mg-13Gd-4Y-2Zn-0.5Zr alloy during the tensile tests under high temperature conditions, and its peak stress decreased with the increase of deformation temperature or strain rate. The Arrhenius equation can be used to fit the rheological behavior of the alloy. The thermal deformation activation energy Q was 259.13kJ/mol, and the maximum error between the model and the experimental data was less than 9%. It can be concluded that the optimum deformation parameters of the alloy were temperature of 500-520 °C and strain rate of 0.01-0.001 s-1 based on the dynamic material model and hot processing map.

High Temperature Deformation Mechanical Model and Processing Map of Ti-6Al-2Zr-1Mo-1V Alloy

2011 ◽  
Vol 199-200 ◽  
pp. 1988-1992
Author(s):  
Yao Ning Wang ◽  
Xi Cheng Zhao ◽  
Hong Zhou Ma
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Power Dissipation ◽  
Processing Map ◽  
Constant Strain Rate ◽  
Stress Index ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Peak Efficiency ◽  
Lower Temperature

Based on the high temperature compression simulation experiments, the mechanical behavior of Ti-6AI-2Zr-1Mo-1V alloy were studied over the range of temperature from 850°C to 1100°C , strain rate from 0.01 to 10s-1. The results show that the flow stress reduces with temperature increasing at the constant strain rate and increases rapidly with strain rate increasing at the constant temperature. The stress index n and deformation activation energy Q is respectively 7.0874 and 610.463 kJ/mol at 850-950°C . While at 950-1100°C , n is 4.7324 and Q is 238.030 kJ/mol. From the obtained processing map, it is found that two unstable regions present at the lower temperature or higher strain rate and two optimum regions in hot deformation process. The unstable zones are 850-950°C , 0.001-0.008s-1of strain rate, and 940-1030°C , 2-10s-1of strain rate respectively. In the optimum zone with the temperature range of 1060-1100°C , strain rate of 0.05-0.65s-1, and the peak efficiency of power dissipation of about 0.42; while in the other zone with the deformation temperature 890-940°C , strain rate of 0.06-0.18s-1, and the peak efficiency of power dissipation of about 0.33.

Hot Deformation Studies of a Low Carbon Steel Containing V

2013 ◽  
Vol 554-557 ◽  
pp. 1224-1231 ◽  
Author(s):  
Cecilia Poletti ◽  
Martina Dikovits ◽  
Javier Ruete
Keyword(s):  
Strain Rate ◽  
Hot Deformation ◽  
Flow Instability ◽  
True Strain ◽  
Low Carbon Steel ◽  
Dynamic Effect ◽  
Rate Sensitivity ◽  
Low Carbon ◽  
Compression Tests ◽  
Deformation Parameters

Low alloyed steels produced by continuous casting are thermomechanically treated to achieve final high mechanical properties, meaning a good combination of strength and toughness. The hot deformation mechanisms of a micro-alloyed steel containing up to 0.1wt% of V is studied by means of hot compression tests using a Gleeble®3800 device. Austenitization of samples is carried out at 1150°C during 2 minutes followed by cooling to the deformation temperature at 1Ks-1in the range of 750 – 1150°C. The studied strain rate range is from 0.01 to 80 s-1and the total true strain achieved is of 0.7. In situ water quenching is applied after the deformation to freeze the microstructure and avoid any post dynamic effect. The Ar3temperature is determined by dilatometry experiments to be 725°C for the used cooling rate. The stress values obtained from the compression tests are evaluated at different strains to determine the strain rate sensitivity and flow instability maps and thus, to predict the formability of the material in the range of studied deformation parameters. These maps are correlated to the microstructure at specific deformation parameters.

Sign in / Sign up

Export Citation Format

Share Document