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Effect of the cooling rate on the graphite nodule count and size distribution in nodular cast iron
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.ORCID-id: 0000-0003-3579-8748
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.ORCID-id: 0000-0003-2449-9232
2018 (Engelska)Ingår i: 11th International Symposium on the Science and Processing of Cast Iron, SPCI-XI 2017, Trans Tech Publications, 2018, Vol. 925, s. 45-53Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The graphite nodule count, size distribution and homogenization of the nodules distribution are the factors which are of more significance for the properties of the material. By just increasing the inoculants or Mg will not help to get rid of problems like the un-even size distribution and or increasing the nodule count. The cooling conditions of the melt prior to solidification and during solidification can control these two parameters to a large extent. In this research, it is more emphasized on the nucleation sequence of MgO particles and on the cooling rates. The nucleation of MgO at different temperatures and at different cooling rates was found to have a great influence on the nodule size distribution and the homogenization of the microstructure. A mathematical model was derived to relate the Mg concentration in the liquid to the cooling rate, prior to solidification. The MgO particles count was calculated as a function of cooling rate. It was found that at higher cooling rates, MgO can be nucleated in multi steps during cooling process, which can increase the nodule count tremendously.

Ort, förlag, år, upplaga, sidor
Trans Tech Publications, 2018. Vol. 925, s. 45-53
Serie
Materials Science Forum, ISSN 0255-5476 ; 925
Nyckelord [en]
Cooling rate, MgO nucleation, Micro segregation, Nodular cast iron, Nodule count, Nodule size distribution
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:kth:diva-238380DOI: 10.4028/www.scientific.net/MSF.925.45Scopus ID: 2-s2.0-85050037831ISBN: 9783035710557 (tryckt)OAI: oai:DiVA.org:kth-238380DiVA, id: diva2:1262455
Konferens
11th International Symposium on the Science and Processing of Cast Iron, SPCI-XI 2017, Jonkoping, Sweden, 4 September 2017 through 7 September 2017
Anmärkning

QC 20181119

Tillgänglig från: 2018-11-12 Skapad: 2018-11-12 Senast uppdaterad: 2018-11-12Bibliografiskt granskad

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Muhmond, Haji MuhammadFredriksson, Hasse

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