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An Investigation of Stainless Steels for Long-term Use in Liquid Sodium at up to 700°C
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The Swedish company Azelio has developed a high-efficient Stirling engine which is powered by solar energy. Since the access of solar power is limited to day-time, Azelio has also developed their own Thermal Energy Storage (TES), which collects and stores solar energy and thereby provides the engine with energy also during night-time. The engine runs a generator which produces electricity, around the clock. Liquid sodium is used as Heat Transfer Fluid (HTF) from the TES to the engine, and the temperature reaches above 600°C. At these temperatures, sodium is highly reactive and surrounding materials could strain from phenomena such as corrosion and creep. By comparing the commonly known high-temperature classified steel 253 MA to other commercially available steels, a suitable and affordable option that can withstand liquid sodium is sought. From literature studies, a list of candidates was produced. The materials were then mainly analysed upon ingoing alloying elements’ influence on material properties. The austenitic steel 153 MA has some great advantages to 253 MA at these temperatures, such as a more stable microstructure. 153 MA is therefore, from this work, recommended for further investigation.

Abstract [sv]

Det svenska företaget Azelio har utvecklat en stirlingmotor som drivs av solenergi. Då tillgången på solenergi är begränsad till dagtid har Azelio också utvecklat en termisk lagringsenhet (TES). Den termiska lagringsenheten absorberar och lagrar solenergi och kan därmed förse stirlingmotorn med värme även under natten. Stirlingmotorn driver i sin tur en generator vilken producerar elektricitet under hela dygnet. Natrium används som värmeledningsfluid (HTF) mellan TES och stirlingmotorn, vid temperaturer över 600°C. Vid dessa temperaturer är natrium högreaktivt och fenomen såsom kryp och korrosion kan uppstå, vilka kan påverka egenskaperna hos omgivande material. Genom att jämföra högtemperaturstålet 253 MA med andra kommersiella stål, eftersöks en kvalificerad och prisvärd legering som kan motstå flytande natrium vid dessa temperaturer. Från en omfattande litteraturstudie skapades en lista med möjliga kandidater. Materialen analyserades sedan i huvudsak utifrån ingående legeringselements påverkan på dess egenskaper. Analysen visar på att 153 MA har några betydande fördelar jämfört med 253 MA, såsom en mer stabil mikrostruktur vid de angivna temperaturerna. Detta arbete rekommenderar därför 153 MA för vidare undersökning och testning.

Place, publisher, year, edition, pages
2019. , p. 27
Series
TRITA-ITM-EX ; 2019:520
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-254324OAI: oai:DiVA.org:kth-254324DiVA, id: diva2:1330680
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2019-07-09 Created: 2019-06-26 Last updated: 2019-07-09Bibliographically approved

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