Influence of dynamic strain aging on plastic instability behaviour of near alpha titanium alloy Timetal 834

摘要

The deformation behaviour of near alpha titanium alloy Timetal 834 was investigated by analysing Considere criterion in temperature range between 300 and 500℃ at an interval of 25℃. In the dynamic strain aging (DSA) regime (400–475℃) studied in this material, Considere criterion was satisfied partially at peak DSA temperature (450℃). This was attributed to maximum DSA effect at 450℃ which eventually resulted in specimen fracture at low ductility levels. Strain hardening exponent (n) values was determined using Ludwik plot, Considere criterion and obtained experimentally from uniform strain. The n values obtained from Ludwik plot and Considere criterion were greater than the uniform strain in DSA regime studied.