Modification of Sintered Titanium Alloys by Hot Isostatic Pressing

Abstract:

Article Preview

Powder metallurgy (PM) permits to obtain titanium alloys with properties and microstructures close to ingot metallurgy products. However, residual porosity is normally present in the products produced by the PM route of powder pressing and sintering (P&S)\, and this needs to be reduced by using post-sintering process step such as hot isostatic pressing (HIP) and forging. In this study, the microstructural and mechanical property changes caused by HIP of samples of two alloys, near-α Ti-3Al-2.5V alloy and α+β Ti-6Al-4V, produced by P&S route were investigated. Two types of powders were utilised: prealloyed powders and blend of elemental titanium powder and master alloy powder. Four conditions defined by HIP temperature, pressure and time were used to HIP the sintered samples with two geometries. The results show that, independent of the HIP conditions used, HIP increased the relative density of the samples to approximately 97.5% and their hardness by 30-50 HV depending on the HIP condition. However, HIP at 1000°C changes the fracture mode of the sintered samples from ductile to brittle.

Info:

Periodical:

Edited by:

Ma Qian

Pages:

63-69

Citation:

L. Bolzoni et al., "Modification of Sintered Titanium Alloys by Hot Isostatic Pressing", Key Engineering Materials, Vol. 520, pp. 63-69, 2012

Online since:

August 2012

Export:

Price:

$38.00

[1] F. Froes, Tenth World Titanium Conference, Materials Technology & Advanced Performance Materials, 19 (2004) 109-114.

[2] F.H. Froes, M.N. Gungor, M.A. Imam, Cost-affordable Titanium: The Component Fabrication Perspective, JOM, 59 (2007) 28-31.

DOI: https://doi.org/10.1007/s11837-007-0074-8

[3] G. Lütjering, J.C. Williams, Titanium: Engineering Materials and Processes, 1st ed., Springer, Manchester, UK, (2003).

[4] C. Leyens, M. Peters, Titanium and Titanium Alloys. Fundamentals and Applications, Wiley-VCH, Köln, Germany, (2003).

[5] A. D. Romig, M. J. DeHaemer, ASM Handbook vol. 7: Powder Metal Technologies and Applications, ASM International, Ohio, USA, (1998).

[6] G. Friedman, R. Regn, Titanium PM Gyro Components, Metal Powders Report, (1984) 273-281.

[7] J.P. Herteman, D. Eylon, F.H. Froes, Mechanical-properties of Advanced Titanium Powder-metallurgy Compacts, Powder Metallurgy International, 17 (1985) 116-119.

[8] R.W. Broomfield, N.G. Turenr, B.I. Leat, Application of Advanced Powder Process Technology to Titanium Aeroengine Components, Powder Metallurgy, 28 (1985) 27-34.

DOI: https://doi.org/10.1179/pom.1985.28.1.27

[9] D. Eylon, R.G. Vogt, F.H. Froes, Property Improvement of Low Chlorine Titanium Alloy Blended Elemental Powder Compacts by Microstructure Modification, Progress in Powder Metallurgy, 42 (1986) 625-634.

[10] M.H. Bocanegra-Bernal, Review Hot Isostatic Pressing (HIP) Technology and its Applications to Metals and Ceramics, Journal of Materials Science, 39 (2004) 6399-6420.

DOI: https://doi.org/10.1023/b:jmsc.0000044878.11441.90

[11] P.A. Russo, R.S. Seagle, Properties of Titanium for Industrial Applications with Emphasis on Ti-3Al-2. 5V, in: Webster/Young (Ed. ) Industrial Applications of titanium and Zirconium: 3rd Conference, ASTM International, 1984, pp.99-112.

DOI: https://doi.org/10.1520/stp32516s

[12] R. Boyer, G. Welsch, E.W. Collings, Materials Properties Handbook: Titanium Alloys, in: A. International (Ed. ), Ohio, USA, (1998).

[13] L. Bolzoni, E.M. Ruiz-Navas, E. Neubauer, E. Gordo, Inductive Hot-pressing of Titanium and Titanium Alloy Powders, Materials Chemistry and Physics, 131 (2012) 672-679.

DOI: https://doi.org/10.1016/j.matchemphys.2011.10.034

[14] L. Bolzoni, P.G. Esteban, E.M. Ruiz-Navas, E. Gordo, Influence of Powder Characteristics on Sintering Behaviour and Properties of PM Ti Alloys Produced from Prealloyed Powder and Master Alloy, Powder Metallurgy, 54 (2011) 543-550.

DOI: https://doi.org/10.1179/003258910x12827272082623