Journal of Materials Engineering and Performance - J MATER ENG PERFORM, 1994
Metastable 13-titanium alloys have improved formability and ductility compared to high-strength i... more Metastable 13-titanium alloys have improved formability and ductility compared to high-strength ix-and ct+[~ titanium alloys; this can be attributed to their body-centered cubic structure in the solution-treated condition. In addition, a high strength level can be achieved by a simple aging treatment. During manufacturing, components are subjected to a variety of thermal cycles at temperatures ranging from 650 to 925 ~ as well as to cooling rates that vary from air cooling to furnace cooling. Consequently, various microstructures are produced that influence the mechanical properties of the products. Th~ study was undertaken to characterize the precipitation behavior of Timetal 21S at various heat treatment conditions by employing x-ray diffraction techniques combined with optical and scanning electron microscopy. It was observed that ct precipitated preferentially on the grain boundaries during high-temperature aging (650 ~ and within the grains during low-temperature aging (400 ~ High-temperature solutioning produced a coarse grain size, and at the same time enhanced finer ct precipitation during aging. The amount of ct precipitate attained after the standard aging treatment was about 33%. Resolution treatment followed by slow cooling, such as that which occurred during brazing of the alloy, resulted in ct precipitation during cooling; however, an aging treatment was necessary to precipitate an ct content greater than 20%.
Journal of Materials Engineering and Performance - J MATER ENG PERFORM, 1994
Metastable 13-titanium alloys have improved formability and ductility compared to high-strength i... more Metastable 13-titanium alloys have improved formability and ductility compared to high-strength ix-and ct+[~ titanium alloys; this can be attributed to their body-centered cubic structure in the solution-treated condition. In addition, a high strength level can be achieved by a simple aging treatment. During manufacturing, components are subjected to a variety of thermal cycles at temperatures ranging from 650 to 925 ~ as well as to cooling rates that vary from air cooling to furnace cooling. Consequently, various microstructures are produced that influence the mechanical properties of the products. Th~ study was undertaken to characterize the precipitation behavior of Timetal 21S at various heat treatment conditions by employing x-ray diffraction techniques combined with optical and scanning electron microscopy. It was observed that ct precipitated preferentially on the grain boundaries during high-temperature aging (650 ~ and within the grains during low-temperature aging (400 ~ High-temperature solutioning produced a coarse grain size, and at the same time enhanced finer ct precipitation during aging. The amount of ct precipitate attained after the standard aging treatment was about 33%. Resolution treatment followed by slow cooling, such as that which occurred during brazing of the alloy, resulted in ct precipitation during cooling; however, an aging treatment was necessary to precipitate an ct content greater than 20%.
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