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Modeling precipitation and its effect on recrystallization during hot strip rolling of niobium steels
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
2008 (engelsk)Inngår i: 3rd Int. Conf. on Thermomechanical Processing of Steels, Padua, Italy, 2008Konferansepaper, Publicerat paper (Annet vitenskapelig) Published
Abstract [en]

Using a physically based model, the microstructural evolution of Nb microalloyed steels during rolling in SSAB Tunnplåt’s hot strip mill was modeled. The model describes the evolution of dislocation density, the creation and diffusion of vacancies, dynamic and static recovery through climb and glide, subgrain formation and growth, dynamic and static recrystallization and grain growth. Also, the model describes the dissolution and precipitation of particles. The impeding effect on grain growth and recrystallization due to solute drag and particles is accounted for. During hot strip rolling of Nb steels, Nb in solid solution retards recrystallization due to solute drag and at lower temperatures strain-induced precipitation of Nb(C,N) may occur which effectively retard recrystallization. The flow stress behavior during hot rolling was calculated where the mean flow stress values were calculated using both the model and measured mill data. The model showed that solute drag has an essential effect on recrystallization during hot rolling of Nb steels.

sted, utgiver, år, opplag, sider
Padua, Italy, 2008.
Emneord [en]
varmvalsning, niob, stål, rekristallisation, solute-drag
Forskningsprogram
Stålformning och ytteknik, Analys av varmbearbetning, industriella applikationer av modellering av mikrostrukturutveckling och mekaniska egenskaper
Identifikatorer
URN: urn:nbn:se:du-3450OAI: oai:dalea.du.se:3450DiVA, id: diva2:521878
Konferanse
3rd Int. Conf. on Thermomechanical Processing of Steels , Padua, Italy, 12-13 september, 2008
Tilgjengelig fra: 2008-10-15 Laget: 2008-10-15 Sist oppdatert: 2012-04-24bibliografisk kontrollert

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