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Casting practices influencing inclusion distributions in billets
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0002-3622-4247
2013 (English)In: Light Metals, ISSN 0147-0809, p. 987-991Article in journal (Refereed) Published
Abstract [en]

A macro-etching method has been used to analyze the distribution and amount of inclusions along billets and on cross sections. Main parameters that have been varied are holding time before casting and amount of liquid remaining after casting. The result show that short holding times, in the order of 10 minutes, give increased amount of inclusions in the beginning of the billets, but holding times in the range from 30 to 60 minutes do not show any significant differences. If the melt remaining in the furnace after casting is less than about 3000 kg, the inclusion density increases towards the end of the ingots. The distribution of inclusions over the cross section of billets show that most inclusions are found in the centre of the billets, however, at increased total amount of inclusions, they tend to appear evenly over the whole cross sections. The results are discussed based on convection in furnace and settling rates and convection at solidification front.

Place, publisher, year, edition, pages
2013. p. 987-991
Keywords [en]
Holding time, Inclusion distribution, Remaining melt, Settling velocity
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-18974Scopus ID: 2-s2.0-84876054446ISBN: 9781118605721 (print)OAI: oai:DiVA.org:miun-18974DiVA, id: diva2:622634
Conference
Light Metals 2012 - TMS 2013 Annual Meeting and Exhibition; San Antonio, TX; United States; 3 March 2013 through 7 March 2013; Code 96505
Note

Source: Scopus

Available from: 2013-05-22 Created: 2013-05-22 Last updated: 2019-04-04Bibliographically approved
In thesis
1. Investigation of the Drawbacks in the Aluminium Alloys Casting Process
Open this publication in new window or tab >>Investigation of the Drawbacks in the Aluminium Alloys Casting Process
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2017. p. 49
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 133
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-32675 (URN)978-91-88527-22-6 (ISBN)
Presentation
2017-10-05, o111, Sundsvall, 10:00 (English)
Supervisors
Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-01-15Bibliographically approved
2. Problems in the Aluminium DC Casting Process Associated with Melt Treatment Operations
Open this publication in new window or tab >>Problems in the Aluminium DC Casting Process Associated with Melt Treatment Operations
2019 (English)Doctoral thesis, comprehensive summary (Other academic) [Artistic work]
Abstract [en]

The quality of DC cast Al alloys is highly dependent on melt batch composition and impurity level in the molten alloy. The chemical composition and cleanliness of a melt is controlled through the melt treatment operations, carried out while the melt is still in the furnace before casting starts. The present work has studied some of these operations and associated problems such as slow dissolution of alloying elements, non-reproducibility in chemical composition analysis and inclusions.

 The results of the dissolution of the alloy elements Mn and Fe showed different behaviors.  For Mn three intermediate phases were involved, all of which exhibited a smooth interface between Mn and the liquid. These three phases were identified as the γ2, Al11Mn4, and µ phases, which grow slowly towards the dissolving Mn particles. The results from the Fe dissolution revealed that only one phase dominates the process, Al5Fe2, which penetrates the Fe particles with an irregular interface.

The interaction between Mn and Ti additions to AA3003 alloys and consequences for the solidification and precipitation behavior was investigated. The study could map the limits for formation of an earlier unknown AlMnTi phase, which formed large particles, detrimental for subsequent rolling operations.

Different sampling procedures for chemical composition analysis were studied, and a novel approach was proposed. A mould with an insulated periphery provided one-dimensional solidification, which gave compositions close to nominal.

 Inclusion distributions along as-cast billets were studied as a function of different holding times, and thus different grades of sedimentation. Holding times longer than 30 minutes did not show any improvements.  It was also shown that if melt remaining in the furnace at end of casting is less than about 3000 kg, the sedimented inclusions are stirred into the bulk again, and can enter into the end of the billet.

The impact on hot tearing susceptibility of different Cu and Fe contents for AA3000 alloys was studied. Cu contents in a range from 0.3 to 1.2 wt%  significantly increase the hot tearing tendency, which was attributed to bad feeding at end of solidification. Decreasing of the Fe content below 0.2 wt%, gives a strong cracking tendency, owing to decreased precipitations of the Al6(Mn,Fe) phase, which contributes to early bridging and thus reinforcement between grains.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2019. p. 67
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 294
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-35937 (URN)978-91-88527-89-9 (ISBN)
Public defence
2019-04-25, M102, Holmgatan 10, Sundsvall, 13:00 (English)
Opponent
Supervisors
Note

Vid tidpunkten för disputationen var följande delarbeten opublicerade: delarbete 6 (inskickat).

At the time of the doctoral defence the following papers were unpublished: paper 6 (submitted).

Available from: 2019-04-04 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved

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Razaz, GhadirCarlberg, Torbjörn

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