DOIONLINE 
DOIONLINE Publish In |
International Journal of Mechanical and Production Engineering (IJMPE)-IJMPE |
 Journal Home Volume Issue |
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Issue |
Volume-3,Issue-6 ( Jun, 2015 ) | |||||||||
Paper Title |
Study Of Globularization In Ti-6al-4v Alloy During Non-Isothermal Multiple Forging And Annealing | |||||||||
Author Name |
Digvijay J. Sheed, Bhagawati P. Kashyap, Rajkumar P. Singh | |||||||||
Affilition |
bharat Forge Limited, Pune, 411036, India Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, India | |||||||||
Pages |
82-86 | |||||||||
Abstract |
In present work the mechanisms of globularization i.e. breaking of initial α colony structure during multiple forging and post deformation annealing process at different temperatures (700°C to 950°C) has been analyzed. A workpiece (Ø94 mm x 120 mm) of Ti-6Al-4V alloy with starting initial α-colony structure was heated at 850°C and subjected to successive upsetting and drawing operations without intermediate heating, followed by water quenching. The deformed Ti-6Al-4V alloy consists of heterogeneous microstructure with kinked, sheared and unreformed α lamellae. Microstructure evolution mechanism during successive upsetting or drawing operations is proposed here. Globularization of thin inter-lamellar β phase was observed after post deformation annealing at 800°C. The process of static globularization was found to be accelerated by increase in annealing temperature above 900°C via mechanisms like boundary splitting, edge spheroidization and cylinderization. Index Terms- Annealing, Globularization, Non-isothermal multiple forging, Ti-6Al-4V alloy | |||||||||
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