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Fatigue Properties of Alloy 718 Manu-factured by Selective Laser Melting Process
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
2018 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 10 poäng / 15 hpOppgaveAlternativ tittel
Utmattningsegenskaper hos Alloy 718 tillverkad med Selective Laser Melting process (svensk)
Abstract [en]

Additive manufacturing (AM) is making its way faster into real time applications rather than prototyping and testing. The various processes used in this metal 3D printing are developing rapidly. The parts fabricated parts with processes like selective laser melting (SLM), electron beam melting (EBM), and laser metal deposition (LMD) have microstructures and properties different from that of conventional processes, hence their properties in relation to micro-structures have to be investigated. Superalloys are known for their superior performance at elevated temperatures; Alloy 718 is one of the widely used Nickel-Iron based superalloy in gas turbines. Several parts of a gas turbine are mainly exposed to high temperatures and fluctuating loads. SLM has been used over a decade now and has well established process parameters. A lot of research has been conducted to study the use of SLM process to man-ufacture Alloy 718 parts.

The aim of this study is to investigate the properties, especially fatigue life of Alloy 718 manufactured by SLM process. The effect of post treatments like hot isostatic pressing and machining on fatigue life is investigated in this study. 4-point bending fatigue tests were performed, and the results are presented and discussed. The defects found such as pores and lack of fusions are analysed and their effect on the properties is discussed as well. Also, the fractographic study is performed to investigate crack initiation and fracture behaviour. The results showed that both post treatments aid in improving fatigue life. The effect of machining is seen higher as compared to hot isostatic pressing.

sted, utgiver, år, opplag, sider
2018. , s. 40
Emneord [en]
Additive manufacturing, selective laser melting, alloy 718, fatigue life, fractography
HSV kategori
Identifikatorer
URN: urn:nbn:se:hv:diva-12983Lokal ID: EXM902OAI: oai:DiVA.org:hv-12983DiVA, id: diva2:1253551
Fag / kurs
Technology
Utdanningsprogram
Produktionsteknik
Veileder
Examiner
Tilgjengelig fra: 2018-10-10 Laget: 2018-10-05 Sist oppdatert: 2020-01-29bibliografisk kontrollert

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