Improvement of Fatigue Strength of Additive Manufactured Metals by Solid-Liquid-Gas Interfacial Phenomena Induced by Pulse Laser

Although additive manufactured (AM) metals are attractive materials, the fatigue strength of AM metals are considerably weak comparing with that of wrought materials. The mechanical surface treatment such as shot peening can improve the fatigue strength of metallic materials. Recently, a novel mecha...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 611; no. 1; pp. 12002 - 12010
Main Author Soyama, Hitoshi
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.10.2019
Subjects
Bending fatigue
Cavitation
Electron beam melting
Fatigue strength
Fatigue tests
Heat treating
Laser shock processing
Lasers
Mechanical properties
Metal fatigue
Shot peening
Surface treatment
Titanium alloys
Titanium base alloys
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Summary:Although additive manufactured (AM) metals are attractive materials, the fatigue strength of AM metals are considerably weak comparing with that of wrought materials. The mechanical surface treatment such as shot peening can improve the fatigue strength of metallic materials. Recently, a novel mechanical surface treatment using solid-liquid-gas interfacial phenomena induced by pulse laser has been developed. In the present paper, in order to demonstrate the improvement of fatigue strength of AM metals by solid-liquid-gas interfacial phenomena, titanium alloy Ti6Al4V manufactured by electron beam melting EBM was treated by submerged pulse laser and tested by a plane bending fatigue test. The key factors were investigated by evaluating the relation between the fatigue properties and mechanical properties of the surface treated by submerged laser peening, cavitation peening and shot peening.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/611/1/012002