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首页> 外文会议>World conference on titanium >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-6.5A-3.5MO-1.5ZR-0.3SI钛合金中的低循环停留时间疲劳

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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°C 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：在520℃的Ti-6.5A-3.5MO-1.5ZR-0.3SI钛合金上在一系列压力下进行升高的温度，低循环停留时间疲劳和常规的低循环疲劳试验。特别令人兴趣的是，微观结构对疲劳行为的影响。通过常规锻造，β锻造和附近的β锻造获得了三种不同的微观结构（等轴，篮网和三种模拟组织）。对该合金高温低周疲劳行为的这些微观结构变化特别注意。发现，当在每个循环的峰值施加三分钟的停留时间时，对于所有测试的微观结构观察到显着的疲劳寿命。在三种微观结构中，等轴微观结构显示出最大的疲劳寿命。篮下微观结构具有比三模态微观结构更高的停留时间疲劳寿命。广泛的SEM和TEM观察结果表明，等轴和三重组织微结构的裂缝的特征在于广泛的准切割刻面和具有轨道样脱位的平面滑动。随着α相百分比的降低，准切割刻面和平面滑动的量减少。虽然腹部裂解和位错网络的表征篮下微观结构的骨折。基于位错剪切α_2颗粒的机制，通过模型解释位错滑的平面性。

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