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Variations in Selective Laser Melted NickelAlloy HX: Mapping of microstructural and mechanical properties of specimens build- up at different positions
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The thesis was carried out at Siemens Industrial Turbomachinery in Finspång with the focus on

Additive Manufacturing (AM) and on Selective Laser Melting (SLM). The purpose of the thesis

was to look into the variations of SLM build (3D printed) test specimens and test cubes made of

the material NickelAlloy HX. Especially variations within the machine, EOSINT M270, and

between different build-up positions of the same machine.

The variations were analysed through microscopy and mechanical testing. The microstructural

evaluation consisted of evaluation of the microstructure, the amount of porosity, the chemical

composition and fracture surface analysis from the mechanical testings. Surface roughness

measurements of as-manufactured (no- machined surface) were done with 3D metrology. The

mechanical testing consisted of hardness measurements, tensile testings, low- cycle fatigue

testings and impact tests.

The microstructural characterization shows that specimens build in NickelAlloy HX with the

method of SLM are homogeneous, dense and crack free weld structure. The average density is

higher than 99,5 [%] in all positions of building plate, while the amount of porosity and amount

of pores is different between different positions. Regarding the mechanical properties are the

failures originating from internal defects such as partly molten powder particles or voids.

Regarding different build- up positions at the building plate is the best mechanical properties

achieved, regarding tensile and LCF properties, found at the lower right position.

The conclusion of the thesis is that within SLM, EOSINT M270 and NickelAlloy HX, is that the

choice of position needs to be weight against field of application and needed properties.

Abstract [sv]

Examensarbetet utfördes hos Siemens Industrial Turbomachinery i Finspång med inriktningen

Additiv Tillverkning (AT) och tekniken Selective Laser Melting (SLM). Examensarbetets syfte

var att undersöka variationerna hos SLM byggda (3D printade) provstavar och provkuber byggda

i materialet NickelAlloy HX. Speciellt variationerna inom maskinen, EOSINT M270, och mellan

olika byggplatser inom samma maskin.

Variationerna analyserades genom mikroskopi och mekanisk provning. Mikroskopin bestod

bland annat av analys av mikrostrukturen, mängden porositet, kemisk sammansättning och

analys av brottytor från den mekaniska provningen. Ytfinhetsmätningar av råytan (inte

maskinbearbetad yta) genomfördes med hjälp av 3D metrologi. Den mekaniska provningen

innehöll bland annat hårdhetsmätning, dragprov, lågcykelutmattning (LCF) och slagprov.

Den mikrostrukturella karaktäriseringen visar att detaljer byggda i NickelAlloy HX och via SLM

tekniken resulterar i ett homogent, kompakt och sprickfri svetsliknande struktur. Den

genomsnittliga densiteten är högre än 99,5% i samtliga positioner på byggplattan. Dock skiljer

sig mängden porositet och antal porer skiljer sig mellan olika positioner. Den mekaniska

provningen visar att brott initieras from interna defekter så som halvsmälta pulverpartiklar eller

porer.

Gällande olika positioner på byggplattan så nås bästa mekaniska egenskaper, gällande dragprov

och LCF, i nedre högra hörnet.

Slutsatsen av examensarbetet är att inom SLM, EOSINT M270 och NickelAlloy HX, är att valet

av position på byggplattan vägas mot användningsområde och önskade mekaniska egenskaper.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Additive Manufacturing, SLM, Hastelloy X, NickelAlloy HX
Keyword [sv]
Additiv tillverkning, SLM, Hastelloy X, NickelAlloy HX
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189763OAI: oai:DiVA.org:kth-189763DiVA: diva2:948813
External cooperation
Siemens Industrial Turbomachinery
Educational program
Master of Science - Materials Science and Engineering
Supervisors
Examiners
Available from: 2017-04-03 Created: 2016-07-13 Last updated: 2017-04-03Bibliographically approved

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