Effect of surface nanocrystallization on fatigue crack initiation and propagation behavior in pure Zr
Effect of surface nanocrystallization on fatigue crack initiation and propagation behavior in pure Zr
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表面纳米化对纯Zr疲劳裂纹萌生和扩展行为的影响
DOI：
10.1016/j.msea.2020.139831
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Jun Yang
中科院分区：
文献类型：
--
作者：
Conghui Zhang;Guodong Song;Yaomian Wang;Min Zheng;Guizhi Xiao;Jun Yang
通过创新的疲劳试验设计，在显微镜下实时观察疲劳裂纹的萌生和扩展过程，系统研究了表面纳米化对纯Zr疲劳性能的影响。结果表明：经超声喷丸45 min处理的纯Zr合金的疲劳极限比原纯Zr合金提高了11.2%；USSP处理可以提高疲劳裂纹的萌生寿命和扩展寿命。当循环应力为225 MPa时，经过45 min ussp处理的纯Zr的疲劳裂纹萌生寿命和扩展寿命分别是原始试样的3.1倍和1.48倍。循环应力越低，疲劳裂纹的起裂寿命提高越明显。启动寿命的提高是ussp处理试样整体疲劳寿命提高的主要原因。疲劳断裂分析结果表明，在原始和ussp处理的试样中都出现了大量的二次裂纹和韧窝。然而，原始纯Zr的疲劳带是无序的，而经过ussp处理的纯Zr的疲劳带是相互平行且垂直于裂纹扩展方向的。
Through an innovative fatigue test design, the initiation and propagation of fatigue cracks were observed with a microscope in real time, and the effects of surface nanocrystallization on the fatigue properties of pure Zr were systematically studied in the work. The results showed that the fatigue limit of pure Zr treated by ultrasonic shot peening (USSP) for 45 min was up to 11.2% higher than that of the original pure Zr. Both the initiation life and propagation life of fatigue cracks could be increased after USSP treatment. When the cyclic stress was set as 225 MPa, the initiation life and propagation life of fatigue cracks in the 45-min USSP-treated pure Zr were 3.1 times and 1.48 times those of the original samples, respectively. The lower the cyclic stress was, the more obvious the improvement in the initiation life of the fatigue cracks. This improvement in initiation life was the main reason for the promotion in the overall fatigue life of the USSP-treated samples. The results of the fatigue fracture analysis showed that a large number of secondary cracks and dimples appeared in both the original and the USSP-treated samples. However, the fatigue bands in the original pure Zr were disorderly, whereas those in the USSP-treated pure Zr were parallel to each other and perpendicular to the direction of crack propagation.
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影响因子：
10.9
作者：
Kuiliang Zhang;Z. B. Wang
通讯作者：
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影响因子：
6
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影响因子：
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影响因子：
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影响因子：
5.4
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通讯作者：
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