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The Effect of Twinning on the Mechanical Properties of Alloy 825
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]

Twinning is a known phenomenon in material science, but how is it connected with grain size and yield strength? Investigations are made on alloy 825 with light optical microscopy for 19 samples to calculate the twin fraction and grain size. Afterwards, the results are compared to yield strength throughout tensile tests. The samples have different reduction of dimension by hot rolling and have been annealed for different time intervals. It turns out that twinning makes alloy 825 slightly softer and more ductile on a smaller scale, since the twin fraction increases when the yield strength decreases. However, the grain size also slightly increases when the yield strength decreases, which is important to have in mind for the connection with the three of them.

Abstract [sv]

Tvillingbildning är ett känt fenomen inom materialvetenskap, men hur hör tvillingar, kornstorlek och sträckgräns ihop? Finns det ett samband? Undersökningar utförs med ett ljusoptiskt mikroskop för legering 825 på 19 prover, för att räkna ut tvillingfraktionen och kornstorleken. Detta jämförs sedan med sträckgränsen som man tillhandahåller från dragprov. Proverna har olika reduktion av sin dimension genom valsning och har glödgats olika tider. Det visar sig att tvillingbildning gör legering 825 något mjukare och mer duktil på en mindre skala, eftersom tvillingfraktionen ökar då sträckgränsen sjunker. Dock ökar även kornstorleken när sträckgränsen minskar, vilket är viktigt att tänka på när det kommer till sambandet mellan kornstorlek, tvillingar och sträckgräns.

Place, publisher, year, edition, pages
2019. , p. 32
Series
TRITA-ITM-EX ; 2019:512
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-254760OAI: oai:DiVA.org:kth-254760DiVA, id: diva2:1335197
External cooperation
Sandvik SMT
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2019-07-09 Created: 2019-07-04 Last updated: 2019-07-09Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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Language
  • de-DE
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  • en-US
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Output format
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