Long fatigue crack growth in Inconel 718 produced by selective laser melting. (November 2016)

• Record Type: Journal Article
• Authors: Konečná, R.; Kunz, L.; Nicoletto, G.; Bača, A.
• Is Part Of: International journal of fatigue. Volume 92:Part 2(2016)
• Page Start: 499
• Page End: 506
• Publication Date: 2016-11
• Subjects: Inconel 718 -- Selective laser melting -- Microstructure -- Fatigue crack growth -- Fractography; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2016.03.012
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Growth of fatigue cracks in IN718 superalloy produced by selective laser melting was determined. IN718 produced by selective laser melting has poor resistance to crack growth in threshold region. Relation of structure of IN718 produced by selective laser melting and crack growth was described. Crack growth mechanism in conventional and selective laser melted material is identical. Abstract: Growth of long fatigue cracks is investigated in Inconel 718 superalloy produced by selective laser melting (SLM). The fatigue crack growth curve and the threshold value of the stress intensity factor are experimentally determined on compact-tension specimens fabricated using a RENISHAW A250 system and the recommended processing parameters. The crack propagation curve and the crack propagation threshold of this SLM material are compared with literature data describing the behavior of conventionally manufactured Inconel 718. The fatigue crack growth is discussed in terms of the specific microstructure and residual stresses produced by selective laser melting.