Iranian Journal of Materials Science and Engineering
Iran University of Science & Technology
Sat, Nov 30, 2024
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Volume 3, Issue 3 (Jul 2006)
IJMSE 2006, 3(3): 9-15 |
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ABBASI S.M., SHOKOUH FAR A., EHSANI N.. PREDICTION OF HOT DEFORMATION BEHAVIOUR OF A PH STAINLESS STEEL AT HIGH STRAIN RATES. IJMSE 2006; 3 (3) :9-15
URL: http://ijmse.iust.ac.ir/article-1-71-en.html
URL: http://ijmse.iust.ac.ir/article-1-71-en.html
Abstract: (33787 Views)
In this study the hot deformation behaviour of a precipitation hardened (PH) stainless steel at high strain rates has been predicted through hot compression testing. Stress-strain curves were obtained for a range of strain rates from 10-3 to 10+1 S-1 and temperatures from 850 to 1150°C. Results obtained by microstructure and stress-strain curves show that at low temperatures and high strain rates, where the Zener-Holman parameter (Z) is high, work hardening and dynamic recovery occure. By increasing temperature and decreasing strain rate, the Z parameter is decreased, so that dynamic recrystallization is the dominant softening mechanism. The results were fitted using a Log Z versus Log (sinh (a sp) diagram allowing an assessment of the behavior of the stresses measured at strain rates closer to those related to the industrial hot rolling schedules. It is clearly shown that the data collected from low strain rate testing can be fairly reasonably extrapolated to higher orders of magnitude of strain rate.
Type of Study: Research Paper |
Subject:
Ceramics
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