期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 120, 期 -, 页码 342-352出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.10.015
关键词
Powder bed fusion; Selective laser melting; Hot isostatic pressing; Ti-6Al-4V; Build defects; Microstructure; Probabilistic model
资金
- ONR [N000141712035]
- Cornell University Biotechnology Resource Center via NIH [1S10OD012287]
- National Science Foundation (NSF) [1657195]
- U.S. Department of Defense (DOD) [N000141712035] Funding Source: U.S. Department of Defense (DOD)
Hot isostatic pressing (HIP) is often needed to obtain powder bed fused (PBF) Ti-6Al-4V parts with good fatigue performance. This manuscript attempts to clarify the mechanisms through which HIP treatment acts to improve high cycle fatigue performance. Several mechanisms are considered and examined against experimental data sets available in the literature. The results suggest that HIP may act most significantly by decreasing the fraction of the defect population that can initiate fatigue cracks, both by decreasing defect sizes below a threshold and by changing the microstructure that surrounds defects. Given the novelty of the latter conclusion, an electron backscatter diffraction microscopy study was performed for validation. The gained understanding provides initial guidance on the choice of optimum HIP soak parameters (Temperature-Pressure-Time) for the high cycle fatigue performance of PBF Ti-6Al-4V.
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