Ti-6Al-4V钛合金疲劳小裂纹扩展行为的研究

胡本润; 吴学仁; 丁传富

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航空材料学报 ›› 2000, Vol. 20 ›› Issue (3) : 33-37.

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论文

Ti-6Al-4V钛合金疲劳小裂纹扩展行为的研究

胡本润;吴学仁;丁传富

作者信息 +

Fatigue small crack behavior of Ti-6Al-4V alloy

HU Ben-run;WU Xue-ren;DING Chuan-fu

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摘要

对两种热处理状态的Ti-6Al4-V锻件钛合金的疲劳小裂纹扩展行为进行了研究。使用应力强度因子范围ΔK对小裂纹和长裂纹的扩展速率进行关联。结果表明,恒幅载荷R=0和R=-1下两种材料都表现出小裂纹效应,R=-1下的小裂纹效应尤为明显。在相同应力比下对两种状态材料的小裂纹效应进行对比发现,应力比R=-1下,两种状态材料的小裂纹扩展行为非常相似。应力比R=0下,片层宽度较小的材料表现出的小裂纹效应较明显。

Abstract

Small crack growth tests were carried out on Ti-6Al4-V forge alloy with two kinds of microstructures prepared by differenTheat treatments. Small and long fatigue crack growth rates, da/dN, are presented against the stress intensity range, ΔK. The results showed the classic small crack effects for the both kinds of microstructures under constant amplitude loading and that the small crack effect was more pronounced at R=-1. Compared the small crack effects of two kinds of microstructures at the same stress ratio, R. It shows that the small cracks effects for both microstructures are same at R=-1. However, at R=0, it is show more pronounced small crack effect for the microstructure with finer grain size.

导出引用

胡本润;吴学仁;丁传富. Ti-6Al-4V钛合金疲劳小裂纹扩展行为的研究[J]. 航空材料学报, 2000, 20(3): 33-37

HU Ben-run;WU Xue-ren;DING Chuan-fu. Fatigue small crack behavior of Ti-6Al-4V alloy[J]. Journal of Aeronautical Materials, 2000, 20(3): 33-37

参考文献

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