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首页> 外文会议>World Conference on Titanium v.3; 20030713-20030718; Hamburg; DE >Low-Cycle Dwell-Time Fatigue in Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Titanium Alloy
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Low-Cycle Dwell-Time Fatigue in Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Titanium Alloy

机译：Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金的低循环停留时间疲劳

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摘要

The elevated-temperature, low-cycle dwell-time fatigue and conventional low-cycle fatigue tests were performed on Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy at 520℃ over a range of stress. Of particular interest in this investigation was the influence of microstructure on fatigue behavior. Three different microstructures (equiaxed, basketweave and tri-modal microstructure) were obtained by conventional forging, beta forging, and near beta forging respectively. Particular attention was given to these microstructural variations on the high-temperature low-cycle fatigue behavior of this alloy. It was found that when a three-minute dwell-time was imposed at the peak of each cycle a significant fatigue life reduction was observed for all microstructures tested. Among the three microstructures, equiaxed microstructure shows the largest fatigue life reduction. Basketweave microstructure has a little higher dwell-time fatigue life than tri-modal microstructure. Extensive SEM and TEM observations show that the fractures for equiaxed and tri-modal microstructures are characterized by extensive quasi-cleavage facets and planar slips with track-like dislocations. The amount of quasi-cleavage facets and planar slips decrease with the decrease of the alpha phase percentage. While the fracture for basketweave microstructure was characterized by cyclic cleavage and dislocation networks. The planarity of dislocation slip was interpreted by a model based on the mechanism of dislocation shearing α_2 particles.
机译：对Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金在520℃的应力范围内进行了高温，低循环停留时间疲劳试验和常规的低循环疲劳试验。在这项研究中特别感兴趣的是微观结构对疲劳行为的影响。分别通过常规锻造，β锻造和近β锻造获得了三种不同的微结构（等腰，篮式组织和三峰微结构）。这些微结构变化对这种合金的高温低周疲劳行为给予了特别关注。发现在每个循环的峰值处施加三分钟的停留时间时，对于所有测试的微结构，观察到明显的疲劳寿命降低。在这三个微结构中，等轴微结构显示出最大的疲劳寿命降低。篮式组织比三峰组织具有更高的停留时间疲劳寿命。大量的SEM和TEM观察表明，等轴和三峰微结构的断裂具有广泛的准解理面和具有滑轨状位错的平面滑动特征。准解理面和平面滑移的数量随着α相百分比的减少而减少。篮状组织的断裂以周期性劈裂和位错网络为特征。通过基于位错剪切α_2颗粒机理的模型解释了位错滑移的平面性。

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