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首页> 外文期刊>材料 >Fatigue crack propagation in equiaxed fine grain Ti-6Al-4V alloy at cryogenic temperature
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Fatigue crack propagation in equiaxed fine grain Ti-6Al-4V alloy at cryogenic temperature

机译：疲劳裂纹在低温温度下等轴细粒Ti-6Al-4V合金中的裂纹繁殖

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摘要

In order to clarify the fatigue crack propagation characteristics at a cryogenic temperature of the equiaxed Ti-6Al-4V alloy, fatigue crack propagation tests were carried out at 77K and 298K. Microscopic observations were also made on thelongitudinal section and fracture surface of specimens. The fatigue crack propagation rate at 77K was smaller than that at 298K, especially in the low propagation rate region, where the crack closure level was higher as compared to that at 298K. The crack propagation characteristics in terms of the effective stress intensity factor range at 77K and those at 298K were close to each other. A marked crack bifurcation was seen in the low propagation rate region at 77K. Transmission electron microscopicobservations revealed that a high-density dislocation structure existed in the close neighbor of crack route, and cracks propagated mainly acrossα-grains accompanied with small branch cracks. Although the fracture surface morphologies at these twotemperatures were almost the same, the plateau in the low propagation rate at 77K was smoother as compared to that at 298K.
机译：为了阐明等式Ti-6Al-4V合金的低温温度下的疲劳裂纹繁殖特性，疲劳裂纹繁殖试验在77K和298K处进行。在标本的细节和骨折表面上也进行了显微镜观察。 77K处的疲劳裂纹传播速率小于298K，特别是在低传播速率区域，其中裂纹闭合水平与298K相比较高。在77K处的有效应力强度因子范围内的裂纹传播特性和298K彼此接近。在77K处的低传播速率区域中看到明显的裂缝分叉。透射电子显微镜可见显示，在裂缝路径的紧密邻居中存在高密度位错结构，并且裂缝主要伴随着α-颗粒伴随着小分支裂缝。虽然这些黄培物质的骨折表面形态几乎相同，但与298K相比，77K的低传播速率的高原在77K上更平滑。

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