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Natural ageing: Process parameters and temperature impact on natural ageing of aluminium profiles
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

It has been found that profiles delivered to customers in unaged (T4) statehave had different hardnesses despite using the same manufacturing process.It has emerged that the material have been stored different periods oftime before use and therefore have small variations in hardness. In furtherprocessing this may lead to problems. This is observed in the alloys 6005,6060 and 6063 despite the same process parameters, such as extrusion speed,heating and cooling.

In order to facilitate the extrusion, natural ageing curves have been constructed.The different process parameters in the press are also investigated,as well as the affect of natural ageing and a comparison of the alloys 6005,6060 and 6063 to see how different alloys are affected by natural ageing.

It was found that natural ageing increases the hardness of all profiles regardlessof composition or process parameters. Different profiles gave differenthardness increases. The process parameters were affected positively by thecomposition of Si and Mg while Fe contamination may have affected the parameters.The result have also shown that the alloy with highest content ofSi and Mg also where the hardest.

Abstract [sv]

Det har framkommit att profiler som levererats till kunder i oåldrat (T4)tillstånd har haft olika hårdheter trots att man använt samma tillverkningsprocess.Det framkom även att materialet har lagrats i olika lång tidinnan användning och därför fått små förändringar i hårdhet. Vid efterföljandebearbetning kan det leda till problem. Detta har man observerati legeringarna 6005, 6060 och 6063 trots samma processparametrar, såsomutlöpningshastighet, uppvärmning och kylning.

För att underlätta extrusionen har kallåldringskurvor konstruerats. De olikaprocessparametrarna i pressen har också undersökts, samt kallåldringens effektoch en jämförelse på de olika legeringarna 6005, 6060 och 6063 har gjortsför att se hur olika legeringar påverkas av kallåldring.

Det visade sig att kallåldringen har ökat hårdheten för alla profiler oavsettsammansättning eller processparametrar. Olika profiler gav olika hårdhetsökning.Processparametrarna påverkades positivt av sammansättningenmed Si och Mg medan föroreningen av Fe kan ha påverkat parametrarna.Resultatet har även visat att legeringen som hade högst halt på Si och Mghade även den hårdaste legeringen.

Place, publisher, year, edition, pages
2017. , p. 50
Keywords [en]
natural ageing, extrusion of aluminium profiles, effect on natural ageing, alloys, series 6005, 6063, 6060
Keywords [sv]
kallåldring, extrudering av aluminiumprofiler, effekt av kallåldring, legeringar, serier 6005, 6063, 6060
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-209816OAI: oai:DiVA.org:kth-209816DiVA, id: diva2:1114656
External cooperation
Sapa Profiler AB
Subject / course
Materials and Process Design
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2017-05-15, Jernkontoret, 08:40 (English)
Supervisors
Examiners
Available from: 2017-06-28 Created: 2017-06-25 Last updated: 2017-06-28Bibliographically approved

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