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Effects of temperature, slip amplitude, contact pressure on fretting fatigue behavior of Ti811 alloys at elevated temperatures

ISSN号：1006-7191
期刊名称：《金属学报：英文版》
时间：0
分类：TG146.23[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学] TE931.2[石油与天然气工程—石油机械设备]
作者机构：[1]Corrosion and Protection Research Laboratory, Northwestern Polytechnical University, Xi＇an 710072, China
相关基金：This study was supported by National Natural Science Foundation of China （Nos.50771070 and 50671085） and National High Technical Research and Development program of China （No.2007AAO3Z521）.

作者： Xiaohua ZHANG Daoxin LIU[1]

关键词：微动疲劳寿命, 接触压力, 反应温度, 疲劳行为, 钛合金, 高温, 高频疲劳, 失效机理, Fretting fatigue （FF）, Elevated temperature, Titanium alloy Slip amplitude, Creep

中文摘要：

温度的效果，在烦恼上滑动振幅，和接触压力 Ti811 钛合金的疲劳(FF ) 行为用一台高频率疲劳机器和一台自制高温度仪器被调查。烦恼的疲劳失败机制被观察烦恼的表面形态学特征学习。结果证明到烦恼的疲劳的敏感在 350 和 500 点高。越高温度，到烦恼的疲劳，失败越敏感。爬影响烦恼的疲劳失败过程在的一个重要因素被提高温度。Ti811 合金的烦恼的疲劳生活不作为 slip 振幅和接触压力增加以一个 monotonic 方法变化。这由于slip 振幅影响疲劳的行动的事实并且在烦恼的过程，和压力影响的名字的接触穿压力和烦恼的振幅的分发和集中在接触表面滑倒，并且进一步因此为繁殖影响裂缝开始概率和驱动力。

英文摘要：

Effects of the temperature, slip amplitude, and contact pressure on fretting fatigue （FF） behavior of the Ti811 titanium alloy were investigated using a high frequency fatigue machine and a home-made high temperature apparatus. The fretting fatigue failure mechanism was studied by observing the fretting surface morphology features. The results show that the sensitivity to fretting fatigue is high at both 350 and 500 ℃. The higher the temperature, the more sensitive to the fretting fatigue failure is. Creep is an important factor that influences the fretting fatigue failure process at elevated temperatures. The fretting fatigue life of the Ti811 alloy does not change in a monotonic way as the slip amplitude and contact pressure increase. This is owing to the fact that the slip amplitude affects the action of fatigue and wear in the fretting process, and the nominal contact pressure affects the distribution and concentration of the stress and the amplitude of fretting slip at the contact surface, and thus further influences the crack initiation probability and the driving force for propagation.

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