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Investigation of Forming Stabilities Criteria in Hot Backward Extrusion of Ti-6Al-4V  

Yeom Jong-Taek (KIMM)
Park Nho-Kwang (KIMM)
Lee You-Hwan (Pohang University of Science And Technology)
Shin Tae-Jin (Pohang University of Science And Technology)
Hwang Sang-Mu (Pohang University of Science And Technology)
Hong Sung-Suk (ADD)
Shim In-Ok (ADD)
Lee Chong-Soo (KIMM)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.7, no.3, 2004 , pp. 84-92 More about this Journal
Abstract
The metal forming behavior of Ti-6Al-4V tube during hot backward extrusion was investigated with various forming stabilities or instabilities criteria. that is, Ziegler's instability criterion, dynamic materials model(DMM) stability criteria and Rao's instability criterion. These approaches also were coupled to the internal variables generated from FE simulation. In order to validate the reliabilities of three criteria, hot backward extrusions for Ti-6Al-4V tube making were carried out with different backward extrusion designs. The useful model for predicting the forming defects was suggested through the comparison between experimental observations and simulation results.
Keywords
성형 안정기준;열간 후방압출;Ti-6Al-4V합금;성형결함;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 S. L. Semiatin, V. Seetharaman and I. Weiss, 'Hot Workability of Titanium and Titanium Aluminide Alloys', Mater. Sci. Eng. A243, 1998, pp.1-24.
2 Prasad Y., Gegel H. L., 1984, 'Modeling of dynamic material behavior in hot deformation: forging of Ti-6242', Metall. Trans., A15, p.1883
3 N. K. Park, J. T. Yeom, Y. S. Na, 'Characterization of deformation stability in hot forging of conventional Ti-6Al-4V using processing maps', J Mater. Process. Technol. Vol. 130~131, 2002, pp.540-545
4 S. L. Semiatin and J. J. Jonas, Formability & Workaility of Metals, ASM, 1984
5 염종택，엄정숙, 박노광, ' Ti - 6AI -4V합금의 열간 성형에 대한 계면열전달계수의 결정 및 분석' 한국소성가공학회지，12권 4호， 2003, pp.370 - 375
6 J C. Malas and V. Seetharaman, 'Using Material Behavior Models to Develop Process Control Strategies', JOM, June 1992, pp.8-13
7 S.V.S. Narayana Murty and B. N. Rao, 'Hot woking characteristics of Zr-2.5Nb using processing maps', Mat. Sci. Tech., Val. 14, 1998, p.835
8 V. Seetharaman, L. Boothe and C. M. Lombard, Microstructure/Property Relationships m Titanium Aluminides and Alloys(Eds. Y. W. Kim, R R Boyer), The Minerals, Metals & Materials Society, 1991, pp.605~622
9 Ziegler, H., 1965, 'Some extremum principles in irreversible thermodynamics with application to continuum mechanics', in Prog. Solid Mech., Sneddon, I. N., and Hill, R(eds.), Vol. 4, Wiley, New York, p.93