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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Flow behaviour and microstructural evolution of Ti-17 alloy with lamellar microstructure during hot deformation in α +βphase field
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Flow behaviour and microstructural evolution of Ti-17 alloy with lamellar microstructure during hot deformation in α +βphase field

机译：α+β相场中热变形过程中层状组织Ti-17合金的流动行为和组织演变

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摘要

The effect of process variables on flow response and microstructure evolution during hot working of Ti-17 (Ti-5AI-2Sn-2Zr-4Mo-4Cr) alloy with lamellar microstructure was established using isothermal hot compression tests at strain rates of 0.001-10 s~(-1), test temperature between 780 and 860°C, and height reductions of 15-75%. All of the flow curves exhibited a peak stress followed by noticeable flow softening, and tended to exhibit a noticeably lower rate of flow softening at the strain of the order of 0.7. The peak flow stress decreased with increasing temperature and decreasing strain rate. Flow softening of the Ti-17 alloy was caused by kinking, break-up and globularisation of lamellas during deformation and, to a small extent, by deformation heating. At high strain rate, adiabatic shear bands and flow localisation were observed to play a role in flow softening. In α+β phase region discontinuous yielding was discovered at higher temperature (>=820°C) and 10 s~(-1). According to the deformation microstructure, lamellar α phase gradually kinked, broke up and globularised of lamellas resulting from the development of shear bands and the penetration of β phase during deformation in the α + β phase field. The degree of dynamic globularisation of α phase increased with increasing strains, temperature and decreasing strain rate.
机译：采用等温热压缩试验，以0.001-10 s的应变速率，建立了具有层状组织的Ti-17（Ti-5AI-2Sn-2Zr-4Mo-4Cr）合金热加工过程中工艺变量对流动响应和组织演变的影响。 〜（-1），测试温度在780至860°C之间，高度降低15-75％。所有的流动曲线均表现出峰值应力，随后显着的流动软化，并且倾向于在0.7的量级时表现出显着较低的流动软化速率。峰值流动应力随着温度的升高和应变率的降低而降低。 Ti-17合金的流动软化是由变形过程中薄片的扭结，破裂和球化引起的，而在较小程度上是由变形加热引起的。在高应变速率下，观察到绝热剪切带和流动局部化在流动软化中起作用。在α+β相区，在较高温度（> = 820°C）和10 s〜（-1）下发现不连续屈服。根据形变的微观结构，层状α相逐渐弯折，破裂和球状化，这是由于剪切带的发展和在α+β相场中β相在渗透过程中的渗透所致。 α相的动态球化程度随应变，温度和应变速率的降低而增加。

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