Heat treatment effect on structure and properties of welded large-dimensioned semi-finished products from VT23 titanium alloy

Dzunovich D.А., Panin P.V., Lukinа E.A., Shiryaev A.A.
UDC
669.295:621.78
DOI
10.18577/2307-6046-2018-0-1-7-7
Article PDF (Russian) (1.03 MB)
How to cite
Dzunovich D.А., Panin P.V., Lukinа E.A., Shiryaev A.A. Heat treatment effect on structure and properties of welded large-dimensioned semi-finished products from VT23 titanium alloy // Proceedings of VIAM. 2018. No. 1. DOI: 10.18577/2307-6046-2018-0-1-7-7. URL: https://test.viam.ru/en/journal/2018/1/7
Keywords
titanium alloy VT23, electron-beam welding, annealing, large-dimensioned semi-finished product, phase composition, structure, mechanical properties.
Abstract

The effect of heating temperature and cooling rate on phase composition, structure, and hardness has been studied for bulk metal and weld joint as well as the hereinbefore mentioned parameters influence on bulk metal mechanical properties for a 80 mm thickness plate of VT23 (Ti–5,5Al–2Mo–4,5V–1Cr–0,6Fe, wt.%) titanium alloy. It has been shown, that two-step heat treatment including annealing at a temperature 100–130С lower than polymorphic transformation temperature with a subsequent air cooling and ageing at 625С gives the opportunity both to form a homogeneous structure along the weld joint section and to obtain bulk metal tensile strength higher than 1100 MPa wherein impact toughness is more than 0,3 MJ/m2.

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