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A number of titanium alloy solutions each containing 2 percent of tin, zirconium, and columbium, and, in addition, either 10 or 20 percent of aluminum or vanadium were prepared. There was no effect on the determination of the tin, zirconium, or columbium regardless of the presence or absence of the aluminum or vanadium. The effect of changing the matrix element from titanium to iron on the relative intensities observed for nickel and chromium was also investigated. Identical amounts of nickel but varying amounts of chromium were added to a group of three iron samples and two titanium samples. Spectrographic solution techniques were applied to a number of series of alloy types, including columbium, vanadium, iron, and molybdenum base alloys. Applications to titanium and uranium alloys are described briefly. The experimental series of uranium alloys submitted for analysis contained columbium, vanadium, titanium, molybdenum, and zirconium.
Electron-beam microprobe analyses were used to assess the uniformity of titanium distribution in both as-cast and heat-treated uranium-0.5 weight percent titanium (U-0.5 Ti) and uranium-0.75 weight percent titanium (U-0.75 Ti) alloys. Microsegregation due to coring was readily smoothed by heat treatment, but long-range variability remained (on the order of 0.1 wt percent). An attempt was made to examine titanium macrosegregation by a scanning image analysis measurement of the volume fraction of U2Ti in an equilibrium microstructure, but a method for consistently obtaining resolvable U2Ti particles could not be developed. As judged by tensile properties, a homogenization heat treatment of 1000° C for 24 hours was apparently the most effective of those tried for homogenizing the U-0.75 Ti alloy. The large grain size of the as-cast tensile bars apparently caused variability in the tensile-test results such that it was difficult to closely assess the optimum values of the heat-treatment parameters. 8 tables, 25 fig. (auth).
The purpose of the research was to determine and study the strengthening mechanisms in the uranium-titanium alloys containing less than 1.0 weight percent titanium.
The uranium-0.8 wt % titanium (U-0.8 Ti) alloy is often used in weapon applications where high strength and fairly good ductility are necessary. Components are immersion quenched in water from the gamma phase to produce a martensitic structure that is amenable to aging. Undesirable conditions occur when a component occasionally cracks during the quenching process, and when tensile specimens fail prematurely during mechanical testing. These two failures prompted an investigative analysis and a series of studies to determine the causes of the cracking and erratic behavior observed in this alloy. Quench-related failures whereby components that cracked either during or immediately after the heat treatment/quenching operation were sectioned for metallographic examination of the microstructure to examine the degree of phase transformation. Examination of premature tensile specimen failures by scanning electron microscopy and x-ray imaging of fracture surfaces revealed pockets of inclusions at the crack origins. In addition, tests were conducted to evaluate the detrimental effects of internal hydrogen on ductility and crack initiation in this allay.