Formation of primary TiN precipitates during solidification of microalloyed steels

Formation of - A Applied A Schneider et al Formation of primary TiN precipitates during solidification of microalloyed steels a A Schneidera C

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A . Schneide r a ,C . Stallybrass a ,J . Konra d a ,A . Kulgemeye r a ,H . Meuse r b ,S . Meimet h b a Salzgitte r Mannesmann Forschung GmbH, Duisburg ,German y b Mannesmannröhren Mülheim GmbH, Mülheim ande r Ruhr ,German y Formation of primary TiN precipitates durin g solidification of microalloyed steel s Scheil versus DICTRA simulation s Modernhigh-strengthlow-alloysteel s commonly contain microalloying additions of titanium , niobiumorvanadiu m in different combinations in ordertoobtain the desired mi- crostructur e and mechanica lproperties . Titaniumha s a strong tendencytoform TiN in the rangeof the solidus tem- perature. This has been reported tohavea negativeeffect on the impac ttoughness of the material. Thermodynamiccal- culation sshowed tha tthe titanium and nitrogen conten t and the titanium tonitrogen ratio determine if the formatio n of TiN takes placeduring solidification or in the solid state. These calculationswhere complemented bysimulations of solidification using the Scheil–Gullive r model and DIC - TRA . The results were compared withmicrostructurein- vestigations of plate and slab materia l with titanium con- tents between 0.003 wt.% and 0.015 wt.% using light - optica lmicroscop y and electron prob emicroanalysis . While the formationo f TiN particles canno t be ruled out even a tthe lowest T ilevels , the temperatureo fformation and the volume fraction varied significantly depending on the Ti content . With respectto the first results of this preli-
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This note was uploaded on 10/08/2009 for the course CME MAT E 630 taught by Professor Dr. during the Fall '09 term at University of Alberta.

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Formation of - A Applied A Schneider et al Formation of primary TiN precipitates during solidification of microalloyed steels a A Schneidera C

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