Decomposition of deformed α′(α″) martensitic phase in Ti–6Al–4V alloy
MATERIALS SCIENCE AND TECHNOLOGY(2019)
Abstract
The process of martensitic alpha '(alpha ") phase decomposition in titanium alloys has not been sufficiently characterised in the literature - especially in terms of plastically deformed martensite. The research results of water-quenched Ti-6Al-4V alloy, subsequently cold deformed in compression test and tempered at the temperature range of 600-900 degrees C for 1 and 2 h were presented in the paper. Light and scanning electron microscopy observations revealed the influence of plastic deformation on tempered martensite laths morphology - particularly at the temperature of 900 degrees C - it favoured their fragmentation and spheroidisation. The effect of plastic deformation on characteristic temperatures of alpha '(alpha ")->alpha + beta phase transformation, phase composition and alloying elements distribution in phase constituents of Ti-6Al-4V alloy was identified and evaluated too. This paper is part of a thematic issue on Titanium. [GRAPHICS]
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Key words
Two-phase titanium alloys,martensitic phase,martensite decomposition,microstructure,plastic deformation
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