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Research Papers

Microstructure Modeling of Dynamically Recrystallized Grain Size of Sintered Al–4 wt % B4C Composite During Hot Upsetting

[+] Author and Article Information
R. Seetharam

Department of Mechanical Engineering,
National Institute of Technology,
Warangal 506004, Telangana, India
e-mail: c2ram88@nitw.ac.in

S. Kanmani Subbu

Department of Mechanical Engineering,
National Institute of Technology,
Warangal 506004, Telangana, India
e-mail: sksubbu@nitw.ac.in

M. J. Davidson

Department of Mechanical Engineering,
National Institute of Technology,
Warangal 506004, Telangana, India
e-mail: mjdavidson2001@yahoo.co.in

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 2, 2017; final manuscript received July 31, 2017; published online September 13, 2017. Assoc. Editor: Khaled Morsi.

J. Eng. Mater. Technol 140(2), 021003 (Sep 13, 2017) (8 pages) Paper No: MATS-17-1123; doi: 10.1115/1.4037660 History: Received May 02, 2017; Revised July 31, 2017

Grain size control of any engineering metal is very important in the hot upsetting process. Generally, the grain size directly controls the mechanical properties and performance of the material. Al–B4C composite finds extensive applications in nuclear industries, defense, and electronic industries. Therefore, the aim of this work is to study the dynamic recrystallization (DRX) behavior of Al–4 wt % B4C composite during the hot upsetting test. Experimental work was performed on sintered Al–4 wt % B4C preforms at various initial relative density (IRD) values of 80%, 85%, and 90%, and over the temperature range of 300–500 °C and strain rates range of 0.1–0.3 s−1. The DRXed grain size of Al–4 wt % B4C preforms for IRDes, and temperatures and strain rates were evaluated by using an optical microscope. The activation energy (Q) and Zener–Hollomon parameter of sintered Al–4 wt % B4C preforms were calculated for various deformation conditions and IRDes. The mathematical models of DRX were developed as a function of Zener–Hollomon parameter for various IRDes to predict the DRXed grain size. It was found that the DRXed grain size decreases with increasing Zener–Hollomon parameter. Verification tests were done between the measured and predicted DRXed grain size for various IRDes, and absolute and mean absolute error was found to be 9.92% and 8.58%, respectively.

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Figures

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Fig. 1

Scanning electron microscope image of (a) aluminum particles and (b) boron carbide particles

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Fig. 2

Experimental procedure for hot upsetting tests

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Fig. 3

Microstructure of sintered Al–4 wt % B4C preforms

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Fig. 4

Initial microstructures of the sintered Al–4 wt % B4C preforms for different IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 5

True stress–true strain curves of Al–4 wt % B4C composite at various deformation conditions and IRDes of (a) 80%, (b) 85%, and (c) 90%

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Fig. 6

Relationship between ln έ–ln σ of Al–4 wt % B4C composite with IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 7

Relationship between ln έ–σ of Al–4 wt % B4C composite with IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 8

Correlation between ln έ–ln[sinh(ασ)] of Al–4 wt % B4C composite with IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 9

Correlation between ln[sinh(ασ)]–1/T of Al–4 wt % B4C composite with IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 10

Correlation between Zener–Hollomon parameters and average DRX grain size of P/M Al–4 wt % B4C composite for various IRDes: (a) 80%, (b) 85%, and (c) 90%

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Fig. 11

Microstructures of Al–4 wt % B4C deformed preforms for 90% IRD and strain rate of 0.1 s−1 at different temperatures: (a) 300 °C, (b) 400 °C, and (c) 500 °C

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Fig. 12

Microstructures of Al–4 wt % B4C deformed preforms for 90% IRD temperature of 500 °C at different strain rates: (a) 0.1 s−1, (b) 0.2 s−1, and (c) 0.3 s−1

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Fig. 13

Microstructures of Al–4 wt % B4C deformed preforms with constant temperature of 400 °C and strain rate 0.2 s−1 at different IRDes: (a) 80%, (b) 85%, and (c) 95%

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Fig. 14

Relationship between calculated and measured average DRX grain size of sintered Al–4 wt % B4C composite for different IRDes: (a) 80%, (b) 85%, and (c) 90%

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