期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 136, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105584
关键词
Defect tolerance assessment; Fatigue crack initiation and propagation; Chapetti model; High cycle fatigue (HCF); Additive manufacturing
资金
- National Natural Science Foundation of China [11572267]
- Doctoral Innovation Funding Program of Southwest Jiaotong University [D-CX201812]
- European Research Council grant (CORREL-CT) [695638]
- EPSRC [EP/P006566/1, EP/R00661X]
- EPSRC [EP/P006566/1] Funding Source: UKRI
Microstructural features and defects arising from selective laser melting (SLM) determine the in-service performance of additively manufactured near-net-shape components. Here the grain type, shape, size and distribution were characterized using electron backscattered diffraction (EBSD). High-resolution synchrotron radiation X-ray computed tomography (CT) was used to quantify the population, morphology and dimensions of porosity and lack of fusion defects. For SLM Ti-6Al-4V alloy, the larger-sized defects in comparison with the alpha grains are more important for crack initiation, typically leading to poor fatigue resistance and a pronounced variation in fatigue life. The fatigue strength was then evaluated in terms of the defect population using a combination of the statistics of extremes and the Murakami model. Finally, an extended Kitagawa-Takahashi fatigue diagram was established within the framework of defect-tolerant design, which includes a classical safe-life region and the defect-determined lifetime in the finite life region.
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