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Segregation during metal sampling
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för naturvetenskap.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för naturvetenskap.ORCID-id: 0000-0002-3622-4247
2014 (Engelska)Ingår i: Materials science forum, Trans Tech Publications Inc., 2014, s. 83-88Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In order to obtain accurate chemical compositions in as-cast billets and ingots the sampling methods for the analysis have to give reproducible results with high precision. OES analysis made on samples at certain milling depths does not always show the desired nominal composition, and especially the macro segregation profiles within the samples can show significant variations. The present work examine the influence of main sampling parameters, such as the volume of the melt, the melt temperature, the mould design and the method of filling the mould, on the segregation. The results point out the importance of the convection in the mould during solidification, and thus the technique of pouring the melt into the sampling mould. © (2014) Trans Tech Publications, Switzerland.

Ort, förlag, år, upplaga, sidor
Trans Tech Publications Inc., 2014. s. 83-88
Nyckelord [en]
Chemical composition, Milling depth, Sampling parameters, Segregation
Nationell ämneskategori
Materialteknik Kemi
Identifikatorer
URN: urn:nbn:se:miun:diva-22636DOI: 10.4028/www.scientific.net/MSF.794-796.83ISI: 000348897900014Scopus ID: 2-s2.0-84904391301ISBN: 9783038351207 (tryckt)OAI: oai:DiVA.org:miun-22636DiVA, id: diva2:748550
Konferens
14th International Conference on Aluminium Alloys, ICAA 2014; Trondheim; Norway; 15 June 2014 through 19 June 2014; Code 106364
Anmärkning

CODEN: MSFOE

Tillgänglig från: 2014-09-19 Skapad: 2014-08-20 Senast uppdaterad: 2019-04-04Bibliografiskt granskad
Ingår i avhandling
1. Investigation of the Drawbacks in the Aluminium Alloys Casting Process
Öppna denna publikation i ny flik eller fönster >>Investigation of the Drawbacks in the Aluminium Alloys Casting Process
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University, 2017. s. 49
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 133
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:miun:diva-32675 (URN)978-91-88527-22-6 (ISBN)
Presentation
2017-10-05, o111, Sundsvall, 10:00 (Engelska)
Handledare
Tillgänglig från: 2018-01-15 Skapad: 2018-01-15 Senast uppdaterad: 2018-01-15Bibliografiskt granskad
2. Problems in the Aluminium DC Casting Process Associated with Melt Treatment Operations
Öppna denna publikation i ny flik eller fönster >>Problems in the Aluminium DC Casting Process Associated with Melt Treatment Operations
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt) [Forskning på konstnärlig grund]
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.

Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University, 2019. s. 67
Serie
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 294
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:miun:diva-35937 (URN)978-91-88527-89-9 (ISBN)
Disputation
2019-04-25, M102, Holmgatan 10, Sundsvall, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

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).

Tillgänglig från: 2019-04-04 Skapad: 2019-04-03 Senast uppdaterad: 2019-04-04Bibliografiskt granskad

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Razaz, GhadirCarlberg, Torbjörn

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