Processing map for the hot working of near-alpha titanium alloy 685

Krishna, Gopala V and Prasad, YVRK and Birla, NC and Rao, Sambasiva G (1997) Processing map for the hot working of near-alpha titanium alloy 685. In: Journal of Materials Processing Technology, 71 (3). pp. 377-383.

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Abstract

Using a dynamic materials model, processing and instability maps have been developed for near-alpha titanium alloy 685 in the temperature range 775-1025 degrees C and strain-rate range of 0.001-10 s(-1) to optimise its hot workability. The alloy's beta-transus temperature lies at about 1020 degrees C. The material undergoes superplasticity with a peak efficiency of 80% at 975 degrees C and 0.001 s(-1), which are the optimum parameters for alpha-beta working. The occurrence of superplasticity is attributed to two-phase microduplex structure, higher strain-rate sensitivity, low flow stress and sigmoidal variation between log flow stress and log strain rate. The material also exhibits how localisation due to adiabatic shear-band formation up to its beta-transus temperature with strain rates greater than 0.02 s(-1) and thus cracking along these regions. (C) 1997 Published by Elsevier Science S.A.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Near-α titanium alloy 685;Processing map;Hot working
Department/Centre:	Others
Date Deposited:	30 Jun 2011 13:59
Last Modified:	30 Jun 2011 13:59
URI:	http://eprints.iisc.ernet.in/id/eprint/38370

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