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Improved surface properties of cast AlSi10 alloy by Nd: YAG-laser surface treatment
1998 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The present study investigates the possibilities to improve the wear resistance of aluminium alloys by using a high power Nd:YAG-laser. Laser surface melting, laser surface alloying and laser impregnation have been examined. A pure nickel powder and a mixed nickel/chromium (80/20) powder were used in laser alloying. In laser impregnation, hard titanium carbides were impregnated in an nickel/chromium alloyed layer. The laser treated specimens were examined by optical microscopy, SEM, EDX and X-ray analyses. For wear tests, the method of three-body abrasion was used. The results show that laser melting produces smooth surfaces with a hardness of about 100 HV (0,1) compared to 55-60 HV(0,1) of the substrate. Hardnesses of up to 1100 HV (0,1) could be reached for both alloying materials but the brittleness of these surfaces limits their use for technical applications. The reason is the formation of a large amount of intermetallic phases are very brittle. Multi-track alloyed and impregnated samples had an average hardness of 200-300 HV (0,1). Their wear resistance could be increased by a factor 2 in the case of alloying and by a factor 3 in the case of combined alloying and impregnation compared to the untreated base material. This work has clearly shown that the wear resistance of an AlSi10 alloy can be increased by alloying and combined alloying and impregnation. Further investigations may include more X-ray and SEM observations and to further develop the alloying and impregnation techniques, because there is a potential to obtain crack free surfaces with a hardness of 500 HV without cracks, which could improve the wear resistance further.

Place, publisher, year, edition, pages
1998.
Keyword [en]
Technology, laserbearbetning, Nd:YAG-laser, ytbehandling, aluminiumlegeringar
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-50302ISRN: LTU-EX--98/150--SELocal ID: 791758bc-572c-4966-9e12-5fc55d98845aOAI: oai:DiVA.org:ltu-50302DiVA: diva2:1023659
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • asciidoc
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