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On the Solidification and Structure Formation during Casting of Large Inserts in Ferritic Nodular Cast Iron
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-7474-2053
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0003-2449-9232
2018 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 49, no 3, p. 1223-1235Article in journal (Refereed) Published
Abstract [en]

The graphite nodule count and size distributions for boiling water reactor (BWR) and pressurized water reactor (PWR) inserts were investigated by taking samples at heights of 2160 and 1150 mm, respectively. In each cross section, two locations were taken into consideration for both the microstructural and solidification modeling. The numerical solidification modeling was performed in a two-dimensional model by considering the nucleation and growth in eutectic ductile cast iron. The microstructural results reveal that the nodule size and count distribution along the cross sections are different in each location for both inserts. Finer graphite nodules appear in the thinner sections and close to the mold walls. The coarser nodules are distributed mostly in the last solidified location. The simulation result indicates that the finer nodules are related to a higher cooling rate and a lower degree of microsegregation, whereas the coarser nodules are related to a lower cooling rate and a higher degree of microsegregation. The solidification time interval and the last solidifying locations in the BWR and PWR are also different.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 49, no 3, p. 1223-1235
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-228260DOI: 10.1007/s11663-018-1221-zISI: 000431318100038Scopus ID: 2-s2.0-85046378628OAI: oai:DiVA.org:kth-228260DiVA, id: diva2:1209543
Note

QC 20180523

Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-05-23Bibliographically approved

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Tadesse, AbelFredriksson, Hasse

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