Transactions of Materials and Heat Treatment

Title：Hot deformation characteristics of Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy using processing maps

Authors： SI Jia-yong GAO Fan ZHANG Ji

Unit： Central South University of Forestry & Technology Central Iron and Steel Research Institute

KeyWords： TiAl alloy processing map dynamic recrystallization hot deformation characteristics

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2010,35(6):112-118

Abstract：

The hot deformation behaviors of Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy in the temperature range of 1000-1200 ℃ and strain rate range of 0.001-1.0 s^-1were studied using hot compressing testing on a Gleeble\|1500 simulator. And a processing map was developed on the basis of these data and the principles of dynamic material modeling. The map exhibits two domains: the first one at 1100 ℃ and 0.01 s^-1 with a peak efficiency of power dissipation of 34%, the second one at 1105 ℃ and 0.001 s^-1 with a peak efficiency of power dissipation of 34%. Optical microscopic observations show that they represent two dynamic recrystallization (DRX) domains with different mechanisms. At temperatures lower than 1140 ℃ and strain rates higher than 0.01 s^-1, the material may be subjected to potential instabilities for the inhomogeneous growing of dynamic recrystallization grains during the hot deformation. At temperatures 1000-1130 ℃ and strain rates higher than 0.02 s^-1, the shear crack of the samples is obviously. On the basis of the above processing map, the hot deformation should be carried out in the dynamic recrystallization domains Ι.

Funds：

863国家高技术研究发展计划(2006AA03A204)

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