Transactions of Materials and Heat Treatment

Title：Investigation on hot deformation behavior of as-casted TB6 titanium alloy in β phase field

Authors： QIU Wei LU Shi-qiang OUYANG De-lai HUANG Xu LEI Li-ming

Unit： Nanchang Hangkong University Institute of Aeronautical Materials

KeyWords： as-casted TB6 titanium alloy hot deformation behavior deformation mechanism

ClassificationCode：TG146.4

year,vol(issue):pagenumber：2010,35(6):119-123

Abstract：

Isothermal constant strain rate compression tests on the as-casted TB6 titanium alloy at temperature of 950-1100 ℃ and strain rate of 0.001-10 s^{^-1} were conducted up to a true strain of 0.92 using the Thermecmastor-Z hot temperature simulator. The hot deformation behavior and deformation mechanisms were studied in the β phase field. The results show that characteristics of flow stress curves of this alloy mainly are of flow oscillation feature and flow softening behavior. The flow stress curve is of the small flow oscillation at 0.001~0.01 s^{^-1}, but the wide range of flow oscillation at 10 s^{^-1} and the flow stress curves show flow softening behavior at 0.1~1 s^{^-1}. Microstructure observation indicates that the deformation mechanism of this alloy exhibits dynamic recrystallization feature at 0.001 s^-1, which shows dynamic recovery behavior as the main deformation mechanism at 0.01~1 s^{^-1} and flow localization behavior at 10 s^{^-1}, respectively. According to the effect of grain refinement and reduction of resistance of deformation, the appropriate strain rate should be no more than 0.1 s^{^-1}.

Funds：

国家重点基础研究发展计划资助（2007CB613803）；国家自然科学基金资助项目（51005112)；航空科学基金资助项目（2009ZE56014）

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