热变形过程中两相钛合金组织演变的研究

A. Churyumov, V. V. Spasenko, D. M. Hazhina, A. Mikhaylovskaya, A. Solonin, A. Prosviryakov
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摘要

本文研究了Ti-3, 5Fe-4Cu-0,2B两相钛合金在单轴压缩热变形过程中的行为。在铸态中加入硼以获得细晶组织。通过在真空感应炉中熔化纯组分并将其随后结晶到固体铜模中,获得了直径为6 mm的合金样品。采用Gleeble 3800热-机械物理模拟系统,在750、800和900℃下,应变率为0,1,进行了真应变为0,9的单轴压缩试验;1和10s - 1。采用扫描电子显微镜对合金初始态和变形态的显微组织进行了研究。根据试验结果,建立了流动应力随温度和应变速率变化的模型。结果表明,压力处理使含有α-Ti、β-Ti和二硼化钛等固溶体的初铸组织发生再结晶。变形过程中,α-钛固溶体晶粒体积分数随温度升高而减小,β相体积分数相反增大。在这种情况下,α-Ti和β-Ti固溶体在变形后的平均晶粒尺寸变化不大。结果表明:在750 ~ 800℃的温度范围内,α相晶粒尺寸从2,2 μm增大到4,5 μm,可以获得较高的复合力学性能;
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STUDY INTO STRUCTURAL EVOLUTION OF TWO-PHASE TITANIUM ALLOY DURING THERMAL DEFORMATION PROCESSING
This paper studies Ti–3,5Fe–4Cu–0,2B two-phase titanium alloy behavior during its thermal deformation processing under uniaxial compression. Boron was added to obtain a fine-grained structure in the cast state. Samples of alloys 6 mm in diameter were obtained by melting pure components in a vacuum induction furnace with their subsequent crystallization into a solid copper mold. Uniaxial compression tests with a true strain of 0,9 were performed using the Gleeble 3800 thermal-mechanical physical simulation system at 750, 800 and 900 °C and strain rates of 0,1; 1 and 10 s–1. Scanning electron microscopy was used to study the microstructure of the alloy in its initial and deformed states. A model of flow stress dependence on temperature and strain rate was built as a result of the tests. It is shown that pressure treatment involves recrystallization of the initial cast structure containing solid solutions based on α-Ti, β-Ti and titanium diboride aggregates. During the deformation process, the volume fraction of α-titanium solid solution grains decreases with rising temperature, and the fraction of the β phase, on the contrary, increases. In this case, the average grain size of solid solutions based on α-Ti and β-Ti varies insignificantly after deformation in almost all of the studied modes. It is shown that the preferred mode of hot pressure treatment for obtaining a high complex of mechanical properties in the investigated alloy is a temperature range of 750– 800 °C, since α-phase grain sizes increase from 2,2 to 4,5 μm with an increase in temperature to 900 °C.
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