通过使用廉价合金元素铁、碳替代昂贵的钒元素制备了低成本超高强钛合金Ti-xFe-3Al(x=7,10,12),利用Gleeble-3500型热模拟试验机研究该合金的热变形行为,在此基础上确定了该合金的锻造工艺.结果表明:Ti-xFe-3Al合金在850 ℃、10 s-1应变速率下变形时,应力-应变曲线的平台阶段较为平稳,且流变应力在400 MPa以下,符合实际锻造生产条件;Ti-xFe-3Al合金较佳的精锻温度为(850±20) ℃;锻态合金中无剪切组织,且抗拉强度高于1 200 MPa.
Low-cost titanium alloys (Ti-xFe-3Al) with super high strength were prepared by using low-cost alloying elements, iron and carbon, instead of higher cost vanadium element.The alloy's thermal deformation behavior was studied by using Gleeble-3500 thermal simulation tester, and forging processes of the alloys were determined.The results show that the stress-plat in stress-strain curve was more stable when deformation temperature of the alloys was 850 ℃ and strain rate was 10 s-1, and the flow stress was under 400 MPa.It was suitable for the forging process.Based on that, the better forging temperature of the alloys was (850±20) ℃.Shearing band did not find in the as-forged alloys, and the alloy's tensile strength was over 1 200 MPa.
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