(中国科学院 金属研究所 沈阳材料科学国家(联合)实验室,沈阳 110016)
摘 要: 研究不同缺口半径和应力比对Ti-24Nb-4Zr-8Sn合金室温高周疲劳性能的影响。结果表明:缺口的存在明显降低合金的疲劳强度,缺口半径和应力比的变化对合金的组织及缺口敏感性影响不大,仅疲劳强度稍有变化。与其他类型常用钛合金相比较,Ti-24Nb-4Zr-8Sn合金具有低的室温疲劳缺口敏感性,这主要归因于其良好的室温塑性以及超弹性变形特点。
关键字: 钛合金;缺口;疲劳缺口敏感性
(Shenyang National Laboratory for Materials Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China)
Abstract:The effect of notch size and R ratios on high cycle fatigue properties at room temperature of Ti-24Nb-4Zr-8Sn alloy was investigated. The results show that, due to the superior high ductility and super-elastic deformation, Ti-24Nb-4Zr-8Sn alloy exhibits low fatigue notch sensitivity. The specimen with notch has a much lower fatigue resistance than the normal ones. The notch size and R ratios have little effect on microstructure and fatigue notch sensitivity, only have some change on the fatigue strength.
Key words: titanium alloy; notch; fatigue notch sensitivity