Flow Behaviour of Ti-6Al-4V Subjected to Multi Directional Isothermal Compression

Abstract

Flow behavior of Ti-6Al-4V was investigated under multi directional isothermal compressions. Flow curves of multi directional isothermal compressions were analyzed to determine softening parameter, which is the ratio of maximum flow stress (r i ) to steady state flow stress (r s ). Multi directional isothermal compressions were carried out at a optimum strain-rate of 10 -2 s -1 . Softening parameter increased gradually from first to third stage of compression. The huge strain imposed on the specimen reduced grain size from 16 lm to approximately 7-8 lm, which is suitable for superplastic deformation and also improved strength.

Evaluation of Tensile Properties and their Correlation with Microstructural Characteristics of a Closed Die Forging of Iso-symmetrical Aerospace Grade Ti-6Al-4V Alloy

“…Gas turbine disk is subjected to high centrifugal loading cycle to increase the compressibility of fan and compressor. Hence Ti-6Al-4V can be tailormade to impart optimum combination of yield strength and fatigue property [11][12][13][14][15][16][17][18][19] . As per the stringent airworthiness certification requirements any rotating component needs to be forged to improve the better properties and structural integrity of the components at critical operating conditions.…”