Conclusions
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1.
A brittle ω-phase can form in the weld metal of a two-phase, medium alloy titanium alloy VT6 upon aging after solutionizing. The ω-phase results in an increased hardness of the weld and a fall of its ductility and toughness.
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2.
The ω-phase in VT6 alloy welds has the character of an intermediate phase formed in the first stage of decomposition of the metastable β-phase. A weld metal of a comosition close to that of the base metal contained a maximum amount of ω-phase; a miniumum of ω was found in welds made with an unalloyed titanium electrode VT1.
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3.
The ω-phase was practically eliminated by long-time aging of solution treated two-phase welds. Such a treatment significantly improved the plastic properties and toughness of the weld metal.
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4.
Studies with an optical microscope at the usual magnifications did not reveal the changes taking place in the structure of aged welds. The detection of small amounts of dispersed ω-phase by X-ray methods was also difficult. The ω-phase in a solution treated weld after short artificial aging is best discovered by electron microscopy.
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Gurevich, S.M., Grabin, V.F. Omega-phase in titanium alloy VT6 welds. Met Sci Heat Treat 2, 491–494 (1960). https://doi.org/10.1007/BF00649727
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DOI: https://doi.org/10.1007/BF00649727