Abstract
The titanium-molybdenum alloys containing 12.2, 7.47 and 2.14 wt%Mo were studied to understand the principles of heat treatment of titanium alloys for the three basic conditions of heat treatment; (a) Water-quenched state. (b) Quenched and reheated state. (c) Isothermally transformed state, chiefly by differential dilatometric method, and also by hardness measurement, X-ray analysis and microscopic observation. By water-quenching 12.2 and 2.14 wt%Mo alloys showed completely retained β and martensite structure respectively, and 7.47 wt%Mo alloy appears to be a mixed structure of them. The hardening and softening reactions are apparently associated with the decomposition of the β-titanium phase and precipitation (ω or α). It was also found that these reactions were accompanied by considerable volume change. The decomposition of martensite structure was also accompanied by volume change, but had little effect upon hardness.
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