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

Gopala Krishna, V. ; Prasad, Y. V. R. K. ; Birla, N. C. ; Sambasiva Rao, G. (1997) Processing map for the hot working of near-α titanium alloy 685 Journal of Materials Processing Technology, 71 (3). pp. 377-383. ISSN 0924-0136

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Using a dynamic materials model, processing and instability maps have been developed for near-α titanium alloy 685 in the temperature range 775–1025°C and strain-rate range of 0.001–10 s−1 to optimise its hot workability. The alloy's β-transus temperature lies at about 1020°C. The material undergoes superplasticity with a peak efficiency of 80% at 975°C and 0.001 s−1, which are the optimum parameters for α-β 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 flow localisation due to adiabatic shear-band formation up to its β-transus temperature with strain rates greater than 0.02 s−1 and thus cracking along these regions.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Near-α Titanium Alloy 685; Processing Map; Hot Working
ID Code:37792
Deposited On:30 Apr 2011 08:04
Last Modified:30 Apr 2011 08:04

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