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首页> 外文期刊>Materials Science and Engineering >Thermal stability of an ultrafine grained Ti-6Al-4V alloy during post-deformation annealing
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Thermal stability of an ultrafine grained Ti-6Al-4V alloy during post-deformation annealing

机译：变形后Ti-6Al-4V超细晶粒合金的热稳定性

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摘要

In the current study, a Ti-6Al-4V alloy plate with a supersaturated martensitic starting microstructure was initially warm rolled, producing a gradient ultrafine-grained (UFG) microstructure throughout the thickness: fully equiaxed UFG in the surface layer and a combination of UFG and elongated grains in the center layer. The thermal stability of the warm rolled UFG microstructures was then investigated through the course of post-deformation annealing treatment. Upon annealing, the fully UFG surface layer experienced concurrent a grain growth and |3 precipitation (i.e. partitioning), whereas the center layer revealed the replacement of partially fragmented a lath by equiaxed grains, most likely through static recrystallization. With increasing annealing time, the overall texture characteristics were mostly preserved for both surface and center layers, apart from a gradual strengthening of the (0°, 0°, 30°) texture component in the surface layer at the expense of the (0°, 0°, 0°) and (0°, 90°, 0°) components. The current post-deformation annealing treatment led to an enhanced tensile elongation of the alloy at the expense of strength, with an increase in the annealing time.
机译：在当前的研究中，首先对具有过饱和马氏体初始显微组织的Ti-6Al-4V合金板进行热轧，从而在整个厚度上产生梯度超细晶粒（UFG）显微组织：表面层中完全等轴的UFG和UFG的组合和在中心层的拉长晶粒。然后，通过变形后退火处理过程研究了热轧UFG显微组织的热稳定性。退火后，完全的UFG表面层同时发生晶粒长大和| 3沉淀（即分配），而中间层则显示等轴晶粒代替了部分破碎的板条，这很可能是通过静态重结晶来实现的。随着退火时间的增加，除了逐渐增强表面层中的（0°，0°，30°）织构成分，而牺牲了（0° ，0°，0°）和（0°，90°，0°）分量。当前的变形后退火处理导致以强度为代价的合金的拉伸伸长率的提高，同时退火时间的增加。

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