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BDG Informationszentrum<br />
Eisengusswerkstoffe<br />
Dokumenten-Nummer: 57857<br />
Tagungsbeitrag<br />
Mrvar, Primoz; Petric, Mitja; Medved, Jozef<br />
Publikationssprache: Englisch<br />
Influence of Cooling Rate and Alloying Elements on Kinetics of Eutectoid Transformation in<br />
Spheroidal Graphite Cast Iron<br />
Einfluss <strong>der</strong> Abkühlungsgeschwindigkeit und von Legierungselementen auf die Kinetik <strong>der</strong> eutetoiden Umwandlung bei<br />
Gusseisen mit Kugelgraphit<br />
Paper deals with influence of cooling rate and alloying elements on kinetics of eutectoid transformation in spheroidal<br />
graphite cast iron (SGI). Transformation of austenite can proceed into ferrite and graphite (gamma Fe*rightwards<br />
arrow*alpha Fe+G) and/or in pearlite (gamma Fe *rightwards arrow* alpha Fe+Fe(ind 3)C). Examination of eutectoid<br />
transformation was made by evaluating the "in-situ" dilatation curves together with metallographic examinations, DTA,<br />
and dilatation analyses in solid state. ThermoCalc software was applied for thermodynamic calculations of phase<br />
equilibria. Based on numerous quantitative relations, such as relation between fractions of ferrite and pearlite in the<br />
as-cast SGI that was determined by analysis of dilatometric curves and taking into account also composition of melt,<br />
ferrite/pearlite ratio in the microstructure could be determined in a very short time. Thus the melt composition could be<br />
corrected by adding Cu and/or Mn or Si, respectively, using the "in situ" dilatation analyses. Characteristic<br />
temperatures of eutectoid transformation have been established from the kinetics of austenite transformation and from<br />
temperature dependence of ferrite and/or pearlite growth. Kinetics curves that enable to determine fractions of single<br />
microstructure constituents in the microstructure as function of transformation time, mainly used for ferrite and pearlite<br />
SGI, can be well determined with physical sigmoidal Boltzmann model.<br />
University of Ljubljana, SI<br />
Erscheinungsjahr 2010<br />
S. S.163-168<br />
Seiten/Bil<strong>der</strong>/Tabellen/Quellen: 6S<br />
<strong>Giesserei</strong> <strong>Literaturschau</strong>
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