Stabilisation Treatment of Titanium Alloy VT9

B.K. Singh; P.N. Singh; V. Singh; C. Ramachandra

doi:10.14429/dsj.49.3826

B.K. Singh Institute of Technology, Banaras Hindu University, Varanasi
P.N. Singh Institute of Technology, Banaras Hindu University, Varanasi
V. Singh Institute of Technology, Banaras Hindu University, Varanasi
C. Ramachandra Hindustan Aeronautics Ltd., Bangalore.

DOI: https://doi.org/10.14429/dsj.49.3826

Keywords: Ageing treatment, Tensile properties, Tensile strength values, Tensile strength

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.

Author Biographies

B.K. Singh, Institute of Technology, Banaras Hindu University, Varanasi

Dr BK Singh obtained his PhD in Physics from Banaras Hindu University (BHU), Varanasi, in 1992. He is working as Research Associate at BHU. His areas of interest include: structure-property correlation in high temperature titanium alloys and radiation effects in metals and alloys.

P.N. Singh, Institute of Technology, Banaras Hindu University, Varanasi

Dr PN Singh obtained his PhD in Metallurgical Engineering from BHU in 1966. Presently, he is working as Assistant General Manager at Tata Iron & Steel Company (TISCO), Jamshedpur. Hisareas of research include: high temperature titanium alloys.

V. Singh, Institute of Technology, Banaras Hindu University, Varanasi

Dr V Singh obtained his PhD in Metallurgical Engineering from BHU in 1974. Presently, he isProfessor & Head of Metallurgical Engineering Dept. at BHU. In recognition of his achievements,he was confemed with prestigious Best Metallurgists Award (1992) by the Ministry of Steel andMines. He was Guest Scientist at the Hahn-Meitner-Institute, Berlin, Germany, during 1987-88 for advanced study on low cycle fatigue behaviour of super alloys. His areas of interest include:structure-property correlations in super alloys, high temperature titanium alloys and radiation effectsin metals and alloys. He has contributed more than 90 research publications in national/international journals

C. Ramachandra, Hindustan Aeronautics Ltd., Bangalore.

Dr C Ramachandra obtained his MTech and PhD in Metallurgical Engineering from ID, Bombay and BHU in 1978 and 1985, respectively. He has been working as Head, Centrd Materials &ProcessLaboratory, Hindustan Aeronautics Ltd, Bangalore, since 1994. He was Guest Scientist at the prestigious Hahn-Meitner-Institute, Berlin, Germany, during 1985-88.His areas of interest include:structure-property correlation in high temperature titanium alloys, including intermetallics,development of aluminium-based metal matrix composites and development of several metallurgicalprocesses. In recognition of his achievements, he was conferred with the Metallurgist of the Year Award in 1977, by the Ministry of Steel and Mines. He has published about 60 research papers in national/ international journals.

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.