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在Gleeble-1500热模拟试验机上进行高温压缩试验,研究了变形温度为1000～1100℃,初始应变速率为0.01～1 s-1的铸态Ti-6Al-4V-0.1B合金的变形行为。基于动态材料模型建立了加工图,并观察了变形组织。结果表明:该合金为热敏感和应力敏感型合金,热变形的最佳变形参数为1050～1100℃,应变速率在0.1～1 s-1之间。铸态大变形区组织为沿着变形方向拉长的原始β晶粒,晶粒组织内部出现针状马氏体,TiB相在变形的过程中出现折断,并沿着加工流线分布。
High-temperature compression tests were carried out on a Gleeble-1500 thermal simulator to study the deformation behavior of as-cast Ti-6Al-4V-0.1B alloy with deformation temperature of 1000-1100 ℃ and initial strain rate of 0.01-1s-1. A process map was established based on a dynamic material model and deformation was observed. The results show that the alloy is a heat-sensitive and stress-sensitive alloy with the best deformation parameters of 1050 ~ 1100 ℃ and strain rate of 0.1 ~ 1 s-1. The as-cast large deformation zone is organized into primitive β grains elongated along the deformation direction, and acicular martensite appears in the grain structure. The TiB phase breaks down during the deformation and is distributed along the processing flow line.