Dynamic and metadynamic recrystallization of Hastelloy X superalloy |
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Authors: | M Aghaie-Khafri N Golarzi |
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Affiliation: | (1) Faculty of Mechanical Engineering, K.N. Toosi University of Technology, P.O. Box 19395-1999, Tehran, Iran |
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Abstract: | Hot compression tests in the temperature range of 900–1150 °C and strain rates varying between 0.001 and 0.5 s−1 were performed on Hastelloy X superalloy in order to investigate the kinetics of hot deformation. An Arrhenius-type equation
was used to characterize the dependence of the flow stress on deformation temperature and strain rate. The results showed
that dynamic recrystallization (DRX) as well as metadynamic recrystallization (MDRX) occurred during hot working. A novel
technique has been developed for calculating the DRX kinetics parameters on the basis of the Johnson-Mehl-Avrami-Kolmogorov
(JMAK) and isothermal transformation rate equations. The variation of grain size in the DRX and MDRX regimes correlated with
the standard Zener–Hollomon parameter. |
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