材料科学
合金
扫描电子显微镜
疲劳试验
断裂(地质)
疲劳极限
融合
复合材料
结构工程
工程类
哲学
语言学
作者
Qingqing Zhao,Xue Li,Junchao Hu,Yanli Jiang,Kun Yang,Hongtao Wang
出处
期刊:International Journal of Structural Integrity
[Emerald (MCB UP)]
日期:2024-03-06
卷期号:15 (2): 382-407
被引量:1
标识
DOI:10.1108/ijsi-01-2024-0001
摘要
Purpose The purpose of this paper is to determine the ultra-high cycle fatigue behavior and ultra-slow crack propagation behavior of selective laser melting (SLM) AlSi7Mg alloy under as-built conditions. Design/methodology/approach Constant amplitude and two-step variable amplitude fatigue tests were carried out using ultrasonic fatigue equipment. The fracture surface of the failure specimen was quantitatively analyzed by scanning electron microscope (SEM). Findings The results show that the competition of surface and interior crack initiation modes leads to a duplex S–N curve. Both manufacturing defects (such as the lack of fusion) and inclusions can act as initially fatal fatigue microcracks, and the fatigue sensitivity level decreases with the location, size and type of the maximum defects. Originality/value The research results play a certain role in understanding the ultra-high cycle fatigue behavior of additive manufacturing aluminum alloys. It can provide reference for improving the process parameters of SLM technology.
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