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Hot working and geometric dynamic recrystallisation behaviour of a near-alpha titanium alloy with acicular microstructure

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Title Hot working and geometric dynamic recrystallisation behaviour of a near-alpha titanium alloy with acicular microstructure
 
Creator BALASUNDAR, I
RAGHU, T
KASHYAP, BP
 
Subject Near-alpha titanium alloy
IMI 834
Globularisation
Avrami analysis
Acicular microstructure
TEMPERATURE DEFORMATION-BEHAVIOR
GLOBULARIZATION KINETICS
FLOW-STRESS
TI-6AL-4V
IMI834
PRECIPITATION
MECHANISMS
EVOLUTION
 
Description The hot working behaviour of near-a titanium alloy - TITAN 29A (equivalent to IMI 834) with an acicular starting microstructure was evaluated by carrying out hot compression tests over a range of temperatures (850-1060 degrees C) and strain rates (3 x 10(-4)-10(0)/s). Using the flow curves, processing maps were generated to identify the safe processing window for the material. The material exhibits a deterministic domain between 920 and 1030 degrees C at low strain rates of 3 x 10(-4)-10(-3)/s where it undergoes geometric dynamic recrystallisaton (GDRX) or globularisation of a lamellae. The initiation and evolution of globularisation was investigated using the flow curve analysis method. The work hardening rate (theta)-flow stress (sigma) curve was used to estimate the critical strain (epsilon(c)) required for initiation of globularisation and the saturation stress (sigma(sat)) for dynamic recovery (DRV). The recrystallised or globularised volume fraction (X) was estimated from the difference between the calculated DRV and experimental DRX curves. The estimated globularised volume fraction modelled using Avrami equation was found to match with the microstructural observations. (c) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:12:34Z
2014-12-28T17:12:34Z
2014
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 600135-144
0921-5093
1873-4936
http://dx.doi.org/10.1016/j.msea.2014.01.088
http://dspace.library.iitb.ac.in/jspui/handle/100/16972
 
Language English