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Study of manganese dissolution in aluminum melts
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.
2016 (English)In: TMS Light Metals, Minerals, Metals & Materials Society, 2016, p. 731-736Conference paper, Published paper (Refereed)
Resource type
Text
Abstract [en]

Problems with the yield during Mn alloy additions and the occurrence of undissolved Mn rich phases in as cast material containing Ti is the background to the present study of the dissolution of Mn compacts in aluminum melts. The dissolution rate of Mn in liquid aluminum, have been studied in pure Al and in Al-0.12%Ti melts. It was found that Ti additions to the melt decreased the dissolution rate of Mn compacts. It was also shown that the intermediate phases formed at the interface between Mn and liquid aluminum was different after small Ti additions. Moreover, an undissolved Mn briquette, found after casting in a furnace, was examined and the conditions for this to happen have been discussed. The discussion was based on calculations of heat balances during the initial dissolution steps and studies of the transformations occurring within the briquette.

Place, publisher, year, edition, pages
Minerals, Metals & Materials Society, 2016. p. 731-736
Keywords [en]
Dissolution rate, Freeze-on layer, Heat transportation, Intermetallic phases, Manganese briquette
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-28496Scopus ID: 2-s2.0-84974604002ISBN: 9781119225799 (print)OAI: oai:DiVA.org:miun-28496DiVA, id: diva2:949668
Conference
Light Metals 2016 - TMS 2016: 145th Annual Meeting and Exhibition; Music City Center, Nashville; United States; 14 February 2016 through 18 February 2016; Code 121631
Note

Scopus ID for book chapter: 2-s2.0-84982238790

Available from: 2016-07-22 Created: 2016-07-21 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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