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Magnetic properties of a martensitic stainless steel powder: Investigation of magnetic properties for a metallic powder with different sizes and its possible correlation to flow properties
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2023 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

For metal powders, flow properties are important. If the powder does not move properly, it can result in problems with the final product in additive manufacturing. Some of the products created with this manufacturing method are complex and used for important purposes such as medical devices and aerospace. Because of this, it is important that the flow properties are good and consistent.

The magnetic properties of metallic powder can affect the flow properties. How this relationship can appear is investigated in this study. The magnetic properties are measured in a Vibrating Sample Magnetometer, where it is easy to see a material's susceptibility, coercivity, demagnetization factor and saturation magnetization. The flow properties of the powder are measured in a rheometer which shows the total energy required to move the powder. An additional aspect considered is the size and sphericity of the powder, which is measured using a particle distribution test.

The results show that the concentration of a magnetic powder does not seem to affect the magnetic properties, but the size of the powder does. The flow properties are found to be better for larger powders and magnetized powder seems to have a slightly improving effect on the flow. The particle distribution test showed that smaller powders are more spherical and have a more precise size distribution. In order to more clearly see a relationship between flow and magnetism, further studies would be needed.

Abstract [sv]

För metallpulver är flödesegenskaper viktigt. Om pulvret inte rör sig ordentligt kan det resultera i problem vid den slutgiltiga produkten vid additiv tillverkning. Vissa av produkterna som skapas med denna tillverkningsmetod är komplexa och används till viktiga ändamål såsom vid medicinska verktyg och till flygindustrin. På grund av detta är det viktigt att flödesegenskaperna är bra och konsekventa.

De magnetiska egenskaperna hos metalliskt pulver kan påverka flödesegenskaperna. Hur denna relation kan te sig undersöks i denna studie. De magnetiska egenskaperna mäts i en Vibrating Sample Magnetometer, där det är lätt att se ett materials susceptibilitet, koercivitet, demagnetiseringsfaktor och mättnadsmagnetisering. Pulvrets flödesegenskaper mäts i en rheometer som visar den totala energi som krävs för att flytta pulvret. En ytterligare aspekt som tas hänsyn till är storleken och sfäriciteten hos pulvret, vilket mäts med hjälp av ett partikelfördelningstest.

Resultaten visar att koncentrationen av ett magnetiskt pulver inte verkar påverka de magnetiska egenskaperna men storleken på pulvret gör det. Flödesegenskaperna visar sig vara bättre för större pulver och magnetiserat pulver verkar ha en något förbättrande effekt på flödet. Partikelfördelningstestet visade att mindre pulver är mer sfäriskt och har en mer precis storleksdistribution. För att tydligare kunna se en relation mellan flöde och magnetism skulle ytterligare studier behövas.

Place, publisher, year, edition, pages
2023. , p. 42
Series
TRITA-ITM-EX ; 2023:147
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-331274OAI: oai:DiVA.org:kth-331274DiVA, id: diva2:1780862
Subject / course
Materials and Process Design
Educational program
Bachelor of Science
Supervisors
Examiners
Available from: 2023-08-22 Created: 2023-07-06 Last updated: 2023-08-22Bibliographically approved

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