Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Slag inclusion formation during solidification of steel alloys and in cast iron
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
2007 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH , 2007. , s. 21
Serie
ISSN KTH/MSE-07/10-SE+CER/AVH
Emneord [en]
solidification, segregation, precipitation, inclusions, inoculation, EMPA
HSV kategori
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
Veileder
Merknad
QC 20101102Tilgjengelig fra: 2007-05-14 Laget: 2007-05-14 Sist oppdatert: 2010-11-02bibliografisk kontrollert
Delarbeid
1. Crack formation during continuous casting of tool steel
Åpne denne publikasjonen i ny fane eller vindu >>Crack formation during continuous casting of tool steel
2005 (engelsk)Inngår i: Transactions of the Indian Institute of Metals, ISSN 0019-493X, Vol. 58, nr 4, s. 671-678Artikkel i tidsskrift (Fagfellevurdert) 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.

Emneord
SOLIDIFICATION PROCESS, ALLOYS, VACANCIES, ALUMINUM, BEHAVIOR
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7083 (URN)000232332700024 ()2-s2.0-33644672764 (Scopus ID)
Merknad
QC 20100907Tilgjengelig fra: 2007-05-14 Laget: 2007-05-14 Sist oppdatert: 2017-12-14bibliografisk kontrollert
2. Macrosegregation In Ingot Cast Tool Steel
Åpne denne publikasjonen i ny fane eller vindu >>Macrosegregation In Ingot Cast Tool Steel
2004 (engelsk)Rapport (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 2004. s. 22
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7084 (URN)KTH-MG-INR-04:09 SE (ISRN)
Merknad
QC 20101102Tilgjengelig fra: 2007-05-14 Laget: 2007-05-14 Sist oppdatert: 2010-12-20bibliografisk kontrollert
3. A thermodynamic analysis of the inoculation process in cast iron.
Åpne denne publikasjonen i ny fane eller vindu >>A thermodynamic analysis of the inoculation process in cast iron.
2006 (engelsk)Rapport (Annet vitenskapelig)
Publisher
s. 21
Serie
Trita-MG, ISSN 1104-7127 ; 2006:03
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7085 (URN)KTH-MG-INR-06:03 SE (ISRN)
Merknad
20100602Tilgjengelig fra: 2007-05-14 Laget: 2007-05-14 Sist oppdatert: 2010-11-02bibliografisk kontrollert
4. MnS precipitation during solidification in presence of oxide nuclei
Åpne denne publikasjonen i ny fane eller vindu >>MnS precipitation during solidification in presence of oxide nuclei
2007 (engelsk)Konferansepaper, Publicerat paper (Annet vitenskapelig)
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7086 (URN)
Konferanse
5th Decennial International Conference on Solidification Processing, 23-25th July 2007, University of Sheffield, UK
Merknad

QC 20101102

Tilgjengelig fra: 2007-05-14 Laget: 2007-05-14 Sist oppdatert: 2012-08-23bibliografisk kontrollert

Open Access i DiVA

fulltekst(851 kB)19460 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 851 kBChecksum SHA-1
08906cab7fd4e537cbdf0362dac419ce4f7b3f6acbdf84cb0faad9aee49584951adb3d3c
Type fulltextMimetype application/pdf

Søk i DiVA

Av forfatter/redaktør
Adolfi, Sofia
Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 19460 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 2929 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf