Stabilisation Treatment of Titanium Alloy VT9
Abstract
Systematic investigations of tensile properties of alpha + beeta type high temperature Ti alloy VT9 (Ti-6 Al-3.3 Mo-1.65 Zr-0.3 Si wt. per cent) developed on ageing at 803, 823 and 853 K for 2, 6 and 121 hr, respectively following the solution treatment in alpha + beeta phase field at 1233 K for 1 hr and air cooling, show that the highest tensile strength values are obtained on ageing at 823 K for 6 or 12 hr. In view of the shorter duration of ageing, the ageing treatment at 823 K for 6 hr is considered appropriate stabilisation treatment for this alloy. The tensile strength values of the alloy VT9 from the newly-established stabilisation treatment are considerably higher than those resulting from the earlier reported stabilisation treatment (at 803 K for 6 hr), in particular at room temperature.References
Mukherjee, D.; Banerjee, D. & Saha, R.L. Microstructure-property correlation in alloy Ti-6.5 Al-3.3 Mu- 1.6 Zr-0.3 Si. Trans. Ind. Inst. Metals, 1982,35(6), 583-94.
Banerjee, D.; Mukherjee, D.; Saha, R.L. & Bose, K. Microstructure and tensile ductility of a heat-treated titanium alloy. Metallurgical Trunsactions, 1983,14(A), 413-20.
Singh, A.K; Ramachandra, C.; Tavafoghi, M. & Singh, V. Structure of martensite in titanium alloy Ti-6Al-1.6 Zr-3.3 Mo-0.3 Si. J. Mat. Sci. Letters, 1993,12,697-99.
Ramachandra, C. & Singh, V. Precipitation of the ordered Ti3Al phase in alloy Ti-6.3 Al-2 Zr-3.3 Mo-0.3 Si. Scripta Metallurgica, 1986,20,509-12.
Rhodes, C.G. & Williams, J.C. Observation of interface phase in alp boundaries in titanium alloy. Metallurgical Transactions, 1975, 6(A),1670-71.
Margolin, H.; Levine, E. & Young, M. The inerface phase in alpha-beta titanium alloys. Metallurgical Transactions, 1977,8(A), 373-77.
Hall, I.W. The interface phase in Ti-6Al-4V. Scand J. Met., 1979,8, 17-20.
Rhodes, C.G. & Paton, N.E. Formation characteristics of the alp interface phase in Ti-6A1-4V. Metallurgical Transactions, 1979, lO(A), 209-16.
Chenu, F.; Servant, C. & Lacombe, P. LA phase A L' Interface alp dans 1' alleage de titane Ti -685. Scripta Metallurgica, 1979,13,951-57.
Chenu, F.; Sevant, C.; Quesne, C. & Lacombe, P. The phase at the alp interface in the Ti-685 alloy. In Titanium 80, Science and Technology, edited by H. Kimura & 0. Izurni, The Metallurgical Society of AIME, Warrendale, USA, 1980. Part 1, pp. 725-33.
Arunachalam, V.S. & Banerjee, D. Titanium alloy for high-temperature. In Titanium 80, Science and Technology, edited by H. Kimura & O. Izumi, The Metallurgical Society of AIME, Warrendale, USA, 1980. Part 4, pp. 2971-79.
Hallam, P. & Harnmond, C. The interface phase in a near-a titanium alloy. In Titanium 80, Science and Technology, edited by H. Kimura & O. Izumi, The Metallurgical Soc. of AIME, Warrendale, USA, 1980. Part 2, pp. 1435-41.
Morgan, G.C. & Hammond, C. The ageing characteristics of Ti-3% AI-8% V-6% Cr-4% Mo-4% Zr (Ti-38644). In Titanium 80, Science and Technology, edited by H. Kimura & O. Izumi, The Metallurgical Society of AIME, Warrendale, USA, 1980, Part 2, pp. 1443-51.
Banerjee, D. & Arunachalam, V.S. On the a/B interface phase in Ti alloys. Acta Metallurgica, 1981,29, 1685-94.
Banerjee, D. & Williams, J.C. The effect of preparation technique on interface phase formation in Ti alloys. Scripta Metallurgica, 1983,17, 1125-26.
Banerjee, D.; Gogia, A.K.; Nandy, T.K. & Joshi, V.A. A new ordered orthorhombic phase in Ti-3Al-Nb alloy. Acta Metallurgica, 1988, 36, 87 1-82.
Sridhar, G. & Sarma, D.S. Discussion of the interface phase formation in titanium alloys. Scripta Metallurgica, 1987,21, 727-30.
Banerjee, D.; Rhodes, C.G. & Williams, J.C. Discussion of contribution by Sridhar and Sarma. Scripta Metallurgica, 1987,21,731-33.
YE, T.T. & Ling, H. A new mechanism of hexagonal interface phase formation. Scripta Metallurgica,. 1989,23, 1755-60.
Servant, C.; Quesne, C.; Baudin, T. & Penelle, R. Contribution to the analysis of the alp interface in some titanium alloys. J. Mater. Res., 1991, 6, 987-97.
Cortial, F. The alp interface phase in titanium alloy: Artifact or real-phase contribution to problem resolution. Metall. Mater. Trans., 1994, 25(A), 241- 48.
Sarma, D.S. Structure-property correlation in titanium alloys, Department of Metallurgical Engineering., Banaras Hindu University, Varanasi, India, 1991. AR&DB Project Report.
Williams, J.C.; Thompson, A.W.; Rhodes, C.G. & Chesnutt, J.C. Strengthening and fracture mechanism in titanium alloys: critical review. In Titanium and titanium alloys: scientific and technological aspects, edited by J.C. Williams and A.F. Belov, Plenum Press, New York, 1982, 1, pp. 467-96.
Ramachandra, C. & Singh, A.K. Age hardening behaviour o f titanium alloy Ti-6A1-5Zr-0.5Mo-0.25SiM.e tallurgical Transactions, 1993,24(A), 763-66.
Singh, A.K.; Rarnachandra, C.; Tavafoghi, M. & Singh, V. Microstructure of B solution- treated, quenched and aged a+B titanium alloy Ti-6 Al-1.6 Zr-3.3 Mo-0.3 Si. J. Alloy Comp., 1992,179, 125-35.
Tavafoghi, M.; Singh, A.K.; Ramachandra, C. & Singh, V. Effect of heat treatment on tensile properties and fracture behaviour of titanium alloys VT-9 and IMI-685. Proceedings of the Joint FEFG/ICF International Conference on Fracture of Engineering Materials and Structures, edited by S.H. Teoh and K.H. Lee, Singapore, 6-8 August 1991. pp. 720-25.
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