Multi-axial fatigue life assessment of additively manufactured nickel-based superalloys

被引：0
作者：
Jin S. [1 ]
Pei C. [1 ,2 ]
Yuan H. [1 ]
Markert B. [3 ]
机构：
[1] Tsinghua University, School of Aerospace Engineering, Beijing
[2] China Academy of Launch Vehicle Technology, Beijing
[3] Institute of General Mechanics, RWTH University, Aachen
来源：
International Journal of Fatigue | 2022年 / 163卷
基金：
中国国家自然科学基金;
关键词：
Anisotropic mechanical behavior; Grain structure; Multi-axial fatigue; Non-proportionality; Selective laser melting (SLM);
D O I：
10.1016/j.ijfatigue.2022.107049
中图分类号：
学科分类号：
摘要：
In the present work, the microstructures and mechanical properties of additively manufactured IN718 alloy were studied and the dendritic columnar microstructures elongated along the building direction are related to macroscopic mechanical properties. Detailed experiments under both proportional and non-proportional multi-axial loading conditions indicate that the influence of the building orientation from manufacturing on mechanical property and fatigue performance is negligible. Fractography analysis reveals that fatigue crack initiates from carbide and oxygen phases. The shear energy-based models reasonably predict the fatigue life and shear failure is the dominant failure mode for the laser melting material. © 2022 Elsevier Ltd
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