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Effects of initial microstructures on hot tensile deformation behaviors and fracture characteristics of Ti-6Al-4V alloy

机译:初始组织对Ti-6Al-4V合金热拉伸变形行为和断裂特性的影响

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摘要

The effects of heat treatment processing on the microstructures of Ti-6Al-4V alloy are systematically studied. Static globularization behavior of lamellar a phase is found when the alloy is cooled in air or furnace from 950-960 ℃ (below the β-transus temperature, about 975 ℃). Three kinds of microstructures (basket-weave, globular-lamellar, and equiaxed microstructures) are obtained by different heat treatments. The uniaxial tensile tests of the studied alloy with different initial microstructures are conducted at the elevated temperature and different strain rates. It is found that the initial microstructures have obvious effects on the tensile properties and fracture mechanisms. The alloy with basket-weave microstructures exhibits the most obvious work hardening behavior and the highest strength. The alloy with globular-lamellar microstructures has the better ductility than that with basket-weave microstructures. Furthermore, the alloy with equiaxed microstructures has the best ductility, because the equiaxed a phases can delay the formation and coalescence of microvoids. Meanwhile, a phases are elongated, bent and spherized, which contributes to the flow softening during tensile deformation. Especially, the alloy with initial equiaxed microstructures finally transforms to bimodal microstructures after tensile fracture. Additionally, the alloys with three different initial microstructures all show a primary ductile fracture.
机译:系统地研究了热处理工艺对Ti-6Al-4V合金组织的影响。当合金在空气或炉中从950-960℃(低于β-转变温度,约975℃)冷却时,发现层状a相的静态球化行为。通过不同的热处理可以获得三种组织(篮状组织,球状组织和等轴组织)。在升高的温度和不同的应变速率下,对具有不同初始微观结构的被研究合金进行了单轴拉伸试验。发现初始的微观结构对拉伸性能和断裂机理有明显的影响。具有篮式组织的合金表现出最明显的加工硬化行为和最高的强度。具有球状片状微结构的合金比具有篮式组织的合金具有更好的延展性。此外,具有等轴结构的合金具有最佳的延展性,因为等轴α相会延迟微孔的形成和聚结。同时,相被拉长,弯曲和球形化,这有助于拉伸变形期间的流动软化。特别是,具有初始等轴组织的合金在拉伸断裂后最终转变为双峰组织。此外,具有三种不同初始微观结构的合金均显示出原始的韧性断裂。

著录项

  • 来源
    《Materials Science and Engineering》 |2018年第10期|293-302|共10页
  • 作者单位

    Light Alloy Research Institute of Central South University, Changsha 410083, China,School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China,State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China;

    Light Alloy Research Institute of Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;

    Light Alloy Research Institute of Central South University, Changsha 410083, China;

    Light Alloy Research Institute of Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;

    State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Alloy; Static globularization; Microstructural morphologies; Flow behavior; Fracture characteristic;

    机译:合金;静态球化;微观结构形态流动行为;断裂特性;

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