Crack initiation behavior and fatigue performance up to very-high-cycle regime of AlSi10Mg fabricated by selective laser melting with two powder sizes. (February 2021)

• Record Type: Journal Article
• Authors: Jian, Z.M.; Qian, G.A.; Paolino, D.S.; Tridello, A.; Berto, F.; Hong, Y.S.
• Is Part Of: International journal of fatigue. Volume 143(2021)
• Publication Date: 2021-02
• Subjects: Selective laser melting -- AlSi10Mg -- VHCF -- Defects -- Crack initiation; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.106013
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: High-cycle and VHCF behavior of AMed AlSi10Mg with different printing powder sizes investigated. Specimens with 20 μm powder size has higher fatigue property than with 50 μm powder size. Unmelted powders were detected as the main source of crack initiation. Five different types of crack initiation modes were identified. Abstract: The high-cycle and very-high-cycle fatigue (VHCF) behavior of AlSi10Mg specimens manufactured by selective laser melting with different printing powder sizes was investigated. The specimens with 20 μm powder size contained more defects than those with 50 μm powder size, and the latter have a higher fatigue property than the former. Unmelted powders were detected as the main source of crack initiation. The specimens printed with 50 μm powder size are more likely to feature subsurface crack initiation in the VHCF regime. Five different types of crack initiation modes were identified, and the fatigue strength was assessed by statistical model.