du.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Icke-metalliska inneslutningars inverkan på tre mekaniska provningsmetoder
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Influence of non-metallic inclusions on three mechanical test methods (English)
Abstract [sv]

I denna rapport gjordes en undersökning om hur en representativ andel icke-metalliskainneslutningar i verktygsstålet Uddeholm Dievar, påverkar de olika mekaniskaprovningsmetoderna Charpy-V, oanvisad slagprovning och dragprovning. Målet meddenna rapport är att ta reda på vilken av de tre provningsmetoderna som minst påverkasav spridningen av icke-metalliska inneslutningar och att se om oanvisad slagprovning gerett jämnare resutat än vid Charpy-V.

Tre charger valdes ut för provning av materialets seghet, draghållfasthet och duktilitet.Innan provningen gjordes en analys av inneslutningesmängden i programmet INCAfeature.Detta för att se om mängden inneslutningar kunde anses vara representativ för allatre chargerna. Resultatet från Charpy-V-provningen och den oanvisade slagprovningenutvärderades i testXpert II och sammanställdes därefter i Microsoft Excel. Medanresultatet från dragprovningen plottades upp i tre spännings- töjningsdiagram som sedanjämfördes . Bilder i SEM togs på brottytan hos det prov vars resultat avvek från de övrigai Charpy-V provningen.

Då materialet Uddeholm Dievar var för duktilt för utrustningen vid den oanvisadeslagprovningen kunde tyvärr inte resultaten från denna provning användas. De slutsatsersom kunde dras av denna undersökning var att dragprovnig var den metod som gav minstspridning av resultatet. Oanvisad slagprovning tros ha gett en mindre spridning änCharpy-V. Företag kommer att fortsätta använda sig av Charpy-V trots att dragprovninggav ett mer korrekt resultat. Detta beror på att Charpy-V är en mer kostnadseffektiv metodoch provstavarna är mindre tidskrävande att producera.

Abstract [en]

This report was made as an investigation of how a representative amount of non- metallicinclusions in the tool steel Uddeholm Dievar, affects the different mechanical testingmethods Charpy-V, un-notched impact testing and tensile testing. The goal of this report isto find out which one of the three test methods that gets least affected by the spread ofnon-metallic inclusions? But also see if the un-notched impact test gives a more evenlyspread result than Charpy-V.

Three charges were selected for testing of the material's toughness, ductility and tensilestrength. The amount inclusions in the material were measured with the help of theprogram INCA feature. This in order to see if the amount of inclusions could beconsidered to be representative in all of three charges. The result of the Charpy V- test andthe un-notched impact test were evaluated in testXpert II and thereafter compiled inMicrosoft Excel. The result of the tensile testing were plotted in three stress- strain graphwhich then were compared against each other. Images were then taken in the SEM onfracture surfaces from Charpy V-specimens in which the values were considered to bedeviating.

The material Uddeholm Dievar was too ductile for the equipment that was used for unnotchedimpact test. Therefore could the results of this test not be used. The conclusionsthat could be drawn from this study was that the result from tensile testing is the one thatis least affected by the representative amount of non-metallic inclusions. Un-nochedtesting is believed to have a smaller footprint than the Charpy-V. Even though the tensiletest gave a more accurate result than the Charp-V-methods, companies will still continueto use the last-mentioned. This mainly because Charpy V is more cost-effective methodand test bars for this method are less time consuming to produce.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Charpy-V, non-metallic inclusions, tensile testing, un-notched impact testing, scanning electron microscopy, Uddeholm Dievar, hot work tool steels.
Keyword [sv]
Charpy-V, icke-metalliska inneslutningar, dragprovning, oanvisad slagseghetsprovning, svepelektronmikroskopi, Uddeholm Dievar, varmarbetsstål.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-14633OAI: oai:DiVA.org:du-14633DiVA: diva2:732177
Available from: 2014-07-03 Created: 2014-07-03 Last updated: 2014-07-03Bibliographically approved

Open Access in DiVA

No full text

Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

Total: 106 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf