Thermo-Mechanical Modeling of Hot Forging Process

[+] Author and Article Information
Siamak Serajzadeh

Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Azadi Ave., Tehran, Iran

J. Eng. Mater. Technol 126(4), 406-412 (Nov 09, 2004) (7 pages) doi:10.1115/1.1631029 History: Received November 22, 2002; Revised May 05, 2003; Online November 09, 2004
Copyright © 2004 by ASME
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True stress-strain curves obtained from (a) single stage experiments, (b) double stage experiments
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Calculated and experimental stress-strain curves under isothermal and constant strain rates conditions for the low carbon steel
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Calculated and experimental stress-strain curves under isothermal and constant strain rates conditions for the high silicon steel
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Theoretical and experimental load-stroke results achieved under nonisothermal condition
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High silicon steel austenite grain size after hot forging at 950°C and strain rate of 0.5 s−1 (a) true strain of 0.4, (b) true strain of 0.65
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Predicted austenite grain size during and after hot nonisothermal forging for the high silicon steel
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Progress of phase transformations for high silicon steel predicted by the model (a) dynamic recovery, (b) dynamic recrystallization, (c) static recrystallization
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Effect of forging condition on temperature and strain heterogeneity during hot nonisothermal forging (sticking friction factor=0.5, reduction=32%) (a) ram velocity of 1 s/mm, (b) ram velocity of 40 s/mm
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Effect of interface heat transfer coefficient on the shape of the final product in the process of hot nonisothermal forging (ram velocity=10 mm/s, sticking friction factor=0.4, reduction=40%) (a) interface heat transfer coefficient of 1500 w/m2 °C, (b) interface heat transfer coefficient of 8500 w/m2 °C
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Effect of chemical composition on the developed strain field during the hot upset forging (ram velocity=10 mm/s, sticking friction factor=0.4, reduction=40%, and interface heat transfer coefficient=6000 w/m2 °C) (a) high silicon steel, (b) low carbon steel
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Comparison between the predicted kinetics of dynamic phase transformations under nonisothermal upset forging for the two kinds of steel (a) dynamic recovery (b) dynamic recrystallization




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