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首页> 外文会议>World Conference on Titanium v.3; 20030713-20030718; Hamburg; DE >Effect of Aging on Fatigue-Crack Growth Behavior of a High-Temperature Titanium Alloy
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Effect of Aging on Fatigue-Crack Growth Behavior of a High-Temperature Titanium Alloy

机译：时效对高温钛合金疲劳裂纹扩展行为的影响

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摘要

The effects of aging on the fatigue-crack growth (FCG) behavior of a newly developed high-temperature titanium alloy (Ti-6Al-4.8Sn-2Zr-lMo-0.4Si-lNd) with bimodal and lamellar microstructures were investigated at room temperature. The results indicate that aging had a more pronounced effect on the lamellar than on the bimodal microstructure. The effect is weakened with prolonged aging time especially for lamellar microstructure. TEM and SEM studies of microstructures and fracture surfaces were performed to gain insight into the deformation characteristics and crack propagation mechanisms of these microstructures. The differences in FCG behavior in different aging conditions were interpreted in terms of the effect of aging time on the microstructure, the crack path tortuosity and crack closure. The dependence of FCG behavior on aging condition can be attributed to the precipitation of the α_2 phase based on Ti_3Al from the two microstructures, and the silicide was found to play a limited role in the present investigation.
机译：在室温下研究了时效对新开发的具有双峰和层状微结构的高温钛合金（Ti-6Al-4.8Sn-2Zr-lMo-0.4Si-1Nd）的疲劳裂纹扩展（FCG）行为的影响。结果表明，老化对层状结构的影响比对双峰微观结构的影响更大。随着时间的延长，这种效果会减弱，特别是对于层状微结构。进行了显微组织和断裂表面的TEM和SEM研究，以深入了解这些显微组织的变形特性和裂纹扩展机理。根据时效时间对显微组织，裂纹路径曲折度和裂纹闭合的影响，解释了在不同时效条件下FCG行为的差异。 FCG行为对时效条件的依赖性可以归因于两个组织中基于Ti_3Al的α_2相的沉淀，发现硅化物在本研究中的作用有限。

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