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The Effects of Cyclic Close Die Forging on Microstructure and Mechanical Properties of Ti – 5Al – 3Mo – 1.5V Alloy
* 1 , * 2 , * 1
1  Faculty of Mechanical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet, Ha Noi, 100000, Viet Nam
2  Institute Technology, General Department of Military Industries and Manufacture, Bac Tu Liem, Ha Noi, 100000, Viet Nam

Abstract:

Superplastic behaviour of certain metals and alloys having very fine grains, very large tensile elongations are obtained within certain temperature ranges at low strain rates. In this work, Ti – 5Al – 3Mo – 1.5V alloy was produced and studied. This paper aims to study the effects of cyclic close die forging on microstructure and mechanical properties of this alloy by considering variable parameters such as deformation temperature (Td) from 8500C, 9000C and 9500C and the number of cycles performed while forging in closed die (n) of 3, 6 and 9 times. The response is average grain size (dtb) and tensile stress (σb). The results indicated that the smallest average grain size 1 μm could be obtained at Td = 9000C, n = 9 times and the tensile stresses are enhanced. The experimental results we obtained also suggest that the microstructure of Ti – 5Al – 3Mo – 1.5V alloy is accordant for for superplastic deformation. The superplastic forming can show maximum elongation of 1000% or more.

Keywords: superplastic deformation; cyclic closed die forging; microstructure; average grain size; Ti – 5Al – 3Mo – 1.5V alloy
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