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Slag inclusion formation during solidification of steel alloys and in cast iron
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
2007 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis explores the formation of segregation and inclusions during solidification of steel and cast iron. A better understanding of the formation mechanism should result in decreasing fraction of defects during solidification of ingot and strand material.

Density driven macrosegregation was studied both experimentally and theoretically to see the effect of channel segregation on the total segregation. Formation of these pencil-like segregations is due to natural convection in the solidifying metal caused by liquid enrichment of elements with lower density compared to the bulk. It is suggested to change the composition to compensate for this density difference.

Inclusion precipitation can be finite by limitations in segregation. Saturated liquid is found in the last solidified areas, often between dendrites. Here the enrichment of the liquid is possible due to microsegregation. Meanwhile crystals form and solidify the elements with low solubility in the solid is pushed out in the remaining liquid. Soon the liquid is saturated to the level where spontaneous formation of inclusions occurs. Microstructure studies by aid of SEM and micro-probe measurements are analysed to find at what point during solidification process the inclusions start to form. In steel making this formation has a detrimental effect on the mechanical properties in contrary to the production of nodular cast iron where the inclusions have a beneficial effect on the graphite formation.

Inoculation of cast iron aims at reaching higher number density of graphite nodules, nodule morphology modification and control of nodule distribution during solidification. Late precipitation of nucleation sites has shown to have a positive impact on preventing chill. To find the most potent inoculation agent different additives were tested. Special effort has been made to analyse the effect of oxides and sulphides as nucleation sites.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH , 2007. , s. 21
Serie
ISSN KTH/MSE-07/10-SE+CER/AVH
Nyckelord [en]
solidification, segregation, precipitation, inclusions, inoculation, EMPA
Nationell ämneskategori
Annan materialteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-4371ISBN: 978-91-7178-624-1 (tryckt)OAI: oai:DiVA.org:kth-4371DiVA, id: diva2:11994
Presentation
2007-05-11, Rum B1, MSE, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Handledare
Anmärkning
QC 20101102Tillgänglig från: 2007-05-14 Skapad: 2007-05-14 Senast uppdaterad: 2010-11-02Bibliografiskt granskad
Delarbeten
1. Crack formation during continuous casting of tool steel
Öppna denna publikation i ny flik eller fönster >>Crack formation during continuous casting of tool steel
2005 (Engelska)Ingår i: Transactions of the Indian Institute of Metals, ISSN 0019-493X, Vol. 58, nr 4, s. 671-678Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The formation of cracks has been studied during continuous casting of a tool steel. Experimental work was performed in a continuous slab caster and the position of the cracks was determined as a function of distance from the cooling surface. Numerically calculated temperatures and elastic stresses were combined with experimentally determined thermomechanical data of the cast material in order to predict crack positions. The model was extended to include the effect on the strain from both thermal shrinkage and the shrinkage caused by condensation of vacancies during the solidification process.

Nyckelord
SOLIDIFICATION PROCESS, ALLOYS, VACANCIES, ALUMINUM, BEHAVIOR
Nationell ämneskategori
Annan materialteknik
Identifikatorer
urn:nbn:se:kth:diva-7083 (URN)000232332700024 ()2-s2.0-33644672764 (Scopus ID)
Anmärkning
QC 20100907Tillgänglig från: 2007-05-14 Skapad: 2007-05-14 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
2. Macrosegregation In Ingot Cast Tool Steel
Öppna denna publikation i ny flik eller fönster >>Macrosegregation In Ingot Cast Tool Steel
2004 (Engelska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2004. s. 22
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:kth:diva-7084 (URN)KTH-MG-INR-04:09 SE (ISRN)
Anmärkning
QC 20101102Tillgänglig från: 2007-05-14 Skapad: 2007-05-14 Senast uppdaterad: 2010-12-20Bibliografiskt granskad
3. A thermodynamic analysis of the inoculation process in cast iron.
Öppna denna publikation i ny flik eller fönster >>A thermodynamic analysis of the inoculation process in cast iron.
2006 (Engelska)Rapport (Övrigt vetenskapligt)
Förlag
s. 21
Serie
Trita-MG, ISSN 1104-7127 ; 2006:03
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:kth:diva-7085 (URN)KTH-MG-INR-06:03 SE (ISRN)
Anmärkning
20100602Tillgänglig från: 2007-05-14 Skapad: 2007-05-14 Senast uppdaterad: 2010-11-02Bibliografiskt granskad
4. MnS precipitation during solidification in presence of oxide nuclei
Öppna denna publikation i ny flik eller fönster >>MnS precipitation during solidification in presence of oxide nuclei
2007 (Engelska)Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:kth:diva-7086 (URN)
Konferens
5th Decennial International Conference on Solidification Processing, 23-25th July 2007, University of Sheffield, UK
Anmärkning

QC 20101102

Tillgänglig från: 2007-05-14 Skapad: 2007-05-14 Senast uppdaterad: 2012-08-23Bibliografiskt granskad

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