Effect of creep parameters on the steady-state flow stress of pure metals processed by high-pressure torsion

2022 ◽  
pp. 142666
Author(s):  
Roberto B. Figueiredo ◽  
Kaveh Edalati ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Steady State ◽  
Flow Stress ◽  
High Pressure Torsion ◽  
Steady State Flow ◽  
State Flow ◽  
Pure Metals

scholarly journals Establishment of Prediction Model of Microstructure and Properties of 3003 Aluminum Alloy during Hot Deformation

2019 ◽  
Vol 25 (4) ◽  
pp. 369-375 ◽  
Author(s):  
Guiqing CHEN ◽  
Gaosheng FU ◽  
Tianyun WEI ◽  
Chaozeng CHENG ◽  
Huosheng WANG ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Steady State ◽  
Flow Stress ◽  
Prediction Model ◽  
Hot Deformation ◽  
Steady State Flow ◽  
State Flow ◽  
Average Grain Size ◽  
The Relationship

The 3003 aluminum alloy was deformed by isothermal compression in the range of deformation temperature 300 – 500 ℃ at strain rate 0.0l – 10.0 s-1 with Gleeble-1500 thermal simulator. A constitutive equation is established from the flow stress of the hot deformation. It is found that the average grain size of the 3003 aluminum alloy increases with the decrease of Zener-Hollomon (Z) value, and there is a linear correlation between them. The prediction model of the steady-state flow stress and the average grain size is established. The steady-state flow stress increases with the decrease of the average grain size. The microhardness of the 3003 aluminum alloy has a positive linear relationship with lnZ, and the relationship between the microhardness and the grain size meets the Hall-Petch equation, which can provide a reference for the microstructure control and rolling equipment selection of the 3003 aluminum alloy under hot deformation conditions.

On the steady state flow stress of iron at low temperature and large strains

1974 ◽  
Vol 5 (2) ◽  
pp. 519-520 ◽  
Author(s):  
C. M. Young ◽  
L. J. Anderson ◽  
O. D. Sherby
Keyword(s):  
Steady State ◽  
Flow Stress ◽  
Low Temperature ◽  
Large Strains ◽  
Steady State Flow ◽  
State Flow

Hot Deformation Behavior and Microstructure of 6069 Aluminum Alloy

2014 ◽  
Vol 788 ◽  
pp. 201-207 ◽  
Author(s):  
Hui Zhong Li ◽  
Jun Jiang ◽  
Min Deng ◽  
Xiao Peng Liang ◽  
Jie Ouyang
Keyword(s):  
Aluminum Alloy ◽  
Steady State ◽  
Flow Stress ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Constant Strain Rate ◽  
Strain Rates ◽  
Steady State Flow ◽  
State Flow

The deformation behavior and microstructure of 6069 aluminum alloy have been studied by isothermal compression at temperature ranging from 300°C to 450°C on Gleeble-1500 machine at strain rates from 0.01 to 10s-1. The results show that the deformation temperature and strain rate is essential to the flow characteristic, and the main deformation mechanism for 6069 aluminum alloy is dynamic recovery at low strain rates. The dynamic recrystallization take place at the strain rates of 10s-1 and deformation temperature ranges of 300~350°C. At constant strain rate, the flow stress and steady-state flow stress decrease with deformation temperature increasing. While at constant temperature, the flow stress and steady-state flow stress increase with increasing strain rate. The processing map at the strain of 0.7 is obtained and the map exhibits two safe deformation domains (300~350°C at 1~10s-1 and 380~450°C at 0.01~0.3s-1).

scholarly journals Correlation of Physical Parameters with Steady-State Hardness of Pure Metals Processed by High-Pressure Torsion

2010 ◽  
Vol 667-669 ◽  
pp. 683-688 ◽  
Author(s):  
Kaveh Edalati ◽  
Z. Horita
Keyword(s):  
High Pressure ◽  
Steady State ◽  
High Pressure Torsion ◽  
Large Strains ◽  
Physical Parameters ◽  
Homologous Temperature ◽  
Pure Metals ◽  
Temperature Shear ◽  
And Diffusion ◽  
Hardness Values

Pure metals of 30 elements with various crystal structures (bcc, fcc, hcp, diamond cubic, complex cubic, primitive hexagonal and tetragonal) are processed by high-pressure torsion (HPT) and their mechanical properties are subsequently evaluated by Vickers microhardness measurements. For all metals, the hardness reaches steady states at large strains where the hardness remains unchanged with further straining. It is shown that the hardness values at the steady state are characteristics of each metal and are successfully expressed as a unique function of the homologous temperature, shear modulus and physical parameters of metals such as melting temperature, specific heat capacity and diffusion coefficient except for a few elements. The findings are well applicable to predict the ultimate steady-state hardness of metals attained by HPT processing through the correlation established in this study.

Calibration 7" – Cutthroat Flume as New Size for Discharge Measurement at Free Flow Condition

2020 ◽  
Vol 38 (12A) ◽  
pp. 1783-1789
Author(s):  
Jaafar S. Matooq ◽  
Muna J. Ibraheem
Keyword(s):  
Steady State ◽  
Flow Condition ◽  
Laboratory Experiments ◽  
Free Flow ◽  
Experimental Program ◽  
Steady State Flow ◽  
Empirical Formulas ◽  
State Flow ◽  
Operation Conditions ◽  
Throat Width

 This paper aims to conduct a series of laboratory experiments in case of steady-state flow for the new size 7 ̋ throat width (not presented before) of the cutthroat flume. For this size, five different lengths were adopted 0.535, 0.46, 0.40, 0.325 and 0.27m these lengths were adopted based on the limitations of the available flume. The experimental program has been followed to investigate the hydraulic characteristic and introducing the calibrated formula for free flow application within the discharge ranged between 0.006 and 0.025 m3/s. The calibration result showed that, under suitable operation conditions, the suggested empirical formulas can accurately predict the values of discharge within an error ± 3%.

A Graphical Method for Storage Coefficient Determination from Quasi-Steady State Flow Data

1996 ◽  
Vol 27 (4) ◽  
pp. 247-254 ◽  
Author(s):  
Zekâi Şen
Keyword(s):  
Steady State ◽  
Graphical Method ◽  
Pumping Test ◽  
Quasi Steady State ◽  
Flow Data ◽  
Steady State Flow ◽  
Storage Coefficient ◽  
State Flow ◽  
Aquifer Test

A simple, approximate but practical graphical method is proposed for estimating the storage coefficient independently from the transmissivity value, provided that quasi-steady state flow data are available from a pumping test. In the past, quasi-steady state flow distance-drawdown data have been used for the determination of transmissivity only. The method is applicable to confined and leaky aquifers. The application of the method has been performed for various aquifer test data available in the groundwater literature. The results are within the practical limits of approximation compared with the unsteady state flow solutions.

Steady-State Flow Behavior of CO2 Foam

2004 ◽  
Author(s):  
J.S. Kim ◽  
Y. Dong ◽  
W.R. Rossen
Keyword(s):  
Steady State ◽  
Flow Behavior ◽  
Steady State Flow ◽  
State Flow ◽  
Co2 Foam
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