STABILITY OF THE $beta$-PHASE IN TITANIUM-VANADIUM ALLOYS

Journal Article · Mon Feb 29 23:00:00 EST 1960 · Zhur. Neorg. Khim.

OSTI ID:4175709

Ageev, N V; Petrova, L A

The stability of the metastable ore resistant t -phase was investigated from -196 tained C to 500 tained C with vanadium contents of 3.7, 12.8, reduction with magnesium. The results of microstructural and x-ray analyses of alloys quenched in water at 20 tained C show that the ore resistant t -phase is fixed in an alloy with 19.3 wt.% vanadium on quenching from 850 tained C. The alloy with 15.1 wt.% vanadium quenched from 1000 tained C has a ore resistant t + / phase structure. The 3.7 wt.% vanadium alloy quenched frcm 900 to 1000 tained C has the structure of a super-saturated alpha -phase ( alpha '). Alloys containing 16, 25, 30, 35, and 40 wt.% vanadi were prepared on a base of titanium made from titanium icdide. The iodide-derived titanium alloy with 15.6 wt.% vanadium had a ore resistant t + / structure on quenching from 900 tained C just as the titanium alloy with 15.1% vanadium with a base of titanium derived by thermal reduction with magnesium. All the other alloys containing 24.4 wt.% vanadium and higher had a structure of a ore resistant t -solid solution (the boundary line of the transition from the ore resistant t -phase to an alpha + ore resistant t phase for iodide-derived titanium alloys). The ore resistant t -solid solution is stable at room temperature and lower, and at 100 tained C for 81 hours. On heating to 200 to 400 tained C the ore resistant t -solid solution decomposes to an intermediate /-phase which passes over into an alpha -phase on increasing the holding time and temperature. The stability of the ore resistant t -solid solution increases with increasing vanadium content, particularly at 200 to 400 tained C. Thus, the ore resistant t -solid solution alloy with 24.2 wt.% vanadium is stable at a temperature of 200 to 400 tained C for not more than 4 hours and 15 minutes, but the ore resistant t -solid solution with 34.3 wt.% vanadium is stuble for 100 hours at the same temperature. In the high vanadium content (28.8%) alloys the ore resistant t -solid solution decomposes directly to the alpha -phase without going through an intermediate /-phase, as the lower vanadium content (24.4% and lower) alloy does. The maximum hardness values were found for the ore resistant t + structure. The hardness of the ore resistant t -alloys is about the same as the alpha + ore resistant t alloys. (TTT)

• Research Organization: Baikov Inst. of Metallurgy, Academy of Sciences, USSR
• NSA Number: NSA-14-019470
• OSTI ID: 4175709
• Journal Information: Zhur. Neorg. Khim., Journal Name: Zhur. Neorg. Khim. Vol. Vol: 5
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

CONFIGURATION
DECOMPOSITION
GRAIN BOUNDARIES
HARDNESS
HEAT TREATMENTS
HIGH TEMPERATURE
MAGNESIUM
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
PREPARATION
QUANTITY RATIO
QUENCHING
REDUCTION
SOLID SOLUTIONS
STABILITY
TEMPERATURE
TITANIUM
TITANIUM ALLOYS
TITANIUM IODIDES
VANADIUM
VANADIUM ALLOYS
VARIATIONS
WATER
X RADIATION