miun.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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
Segregation during metal sampling
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
2014 (English)In: Materials science forum, Trans Tech Publications Inc., 2014, p. 83-88Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. p. 83-88
Keywords [en]
Chemical composition, Milling depth, Sampling parameters, Segregation
National Category
Materials Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-22636DOI: 10.4028/www.scientific.net/MSF.794-796.83ISI: 000348897900014Scopus ID: 2-s2.0-84904391301ISBN: 9783038351207 (print)OAI: oai:DiVA.org:miun-22636DiVA, id: diva2:748550
Conference
14th International Conference on Aluminium Alloys, ICAA 2014; Trondheim; Norway; 15 June 2014 through 19 June 2014; Code 106364
Note

CODEN: MSFOE

Available from: 2014-09-19 Created: 2014-08-20 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

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Razaz, GhadirCarlberg, Torbjörn

Search in DiVA

By author/editor
Razaz, GhadirCarlberg, Torbjörn
By organisation
Department of Natural Sciences
Materials EngineeringChemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 218 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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