期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 18, 页码 5983-5992出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.046
关键词
Titanium alloys; Fatigue crack growth; Microstructure; Stress ratio
类别
资金
- Austrian Federal Ministry for Transport, Innovation and Technology
- Austrian Federal Ministry of Economics and Labor
- federal government of Styria
- federal government of Tyrol
- federal government of Vienna
- federal government of Upper Austria
- federal government of Lower Austria
- Austrian Research Promotion Agency
- Bohler Schmiedetechnik GmbH & Co KG Kapfenberg
Ti-6Al-4V is a commonly used titanium base alloy in aerospace applications. The increasing demand for damage-tolerant designs of such components necessitates a detailed knowledge of its crack growth behavior. The aim of this research was the characterization and phenomenological modeling of long crack growth behavior with respect to microstructure and stress ratio. Therefore, the long crack propagation was characterized for eight different heat treatment conditions and four stress ratios. For comparison, physically short crack growth tests were also performed. The long crack growth threshold was found to be dominated by roughness-induced crack closure, and the fracture surface roughness is controlled by the primary a-grain size. The reason for this correlation is a near-threshold crack propagation mode, which is dominated by the transcrystalline fracture of a-grains. This correlation was used to model the crack growth threshold with respect to microstructure. A linear relation was determined between the stress ratio and the threshold value, which was also found in this approach. Further presented models cover the crack growth behavior in the near-threshold (Stage I) and mid-growth rate regions (Stage II). (C) 2011 Elsevier B.V. All rights reserved.
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