Study of Interstitial Impurities Influence on Properties of Titanium Alloy Ti-5Al-5V-5Mo-3Cr-1Zr

Abstract:

The effect of different interstitial impurities content (oxygen, carbon) on β - transus temperature and complex of properties in the heat-strengthened condition of the Ti-5Al-5V-5Mo-3Cr-1Zr (VST55531) titanium alloy has been studied. The possibility of determining alloy β - transus temperature by the differential scanning calorimetry method with accuracy comparable with the test quenching method is shown in this paper. It is shown that under identical aging regimes an increase of oxygen content from 0.176 to 0.25 wt.% and carbon content from 0.009 to 0.025 wt.% in VST55531 alloy results in higher strength, plastic characteristics and lower ductility, toughness characteristics, especially those which related to the crack propagation.

• Periodical: Solid State Phenomena (Volume 284)
• Pages: 460-464
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.284.460
• Online since: October 2018
• Authors: A.V. Zhelnina*, A.G. Illarionov, A.V. Trubochkin
• Keywords: Carbon, Differential Scanning Calorimetry, Hardening Heat Treatment, Interstitial Impurities, Oxygen, Physical-Mechanical Properties, Test Quenching Method, Titanium Alloy VST55531, β-Transus Temperature

References

[1] J.D. Cotton and others, State of the Art in Beta Titanium Alloys for Airframe Applications, JOM. 67(6) (2015) 1281-1303.

DOI: 10.1007/s11837-015-1442-4

[2] K.V. Aleksandrov and others, Semi-finished products from titanium alloys, VILS, Moscow, (1996).

[3] D.V. Gadeev and others, Using the method of thermal analysis to determine the temperature of the complete polymorphic transformation of two-phase titanium alloy, Titan, 1 (2010) 24-30.

[4] D.V. Gadeev, Investigations of phase transformations by the methods of structural and thermal analysis in two-phase alloys based on titanium, Ekaterinburg: UFU, (2012).

[5] Z. Liu, G. Welsh, Effects of oxygen and heat treatment on the mechanical properties of alpha and beta titanium alloys, Met. Trans. A. 19A(3) (1988) 527-542.

[6] A.I. Kahveci, G. Welsh, Effect of oxygen on the hardness and alpha - beta phase ratio of Ti-6Al-4V alloy, Scripta Metall. 20 (1986) 1287-1290.

DOI: 10.1016/0036-9748(86)90050-5

[7] H. Conrad, Effect of interstitial solutes on the strength and ductility of titanium, Progress in Materials Science, 26(2-4) (1981) 123-403.

DOI: 10.1016/0079-6425(81)90001-3

[8] M. Wasserman, V.A. Danilkin, O.S. Korobov and others, Methods of control and investigation of light alloys: Metallurgy, Moscow, (1985).