ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The kinetics of phase transformations in medium-carbon forging steels (MCFS) have beenmodeled based on CALPHAD multicomponent thermodynamics and the classical nucleation-growththeory. New treatments include the time dependency of parabolic growth rate of proeutectoid ferrite(α) , which account for the soft impingement effect by carbon enrichment in austenite (γ). And apotential transition of γ/α interface equilibrium has also been considered depending on temperaturesand velocity of the moving interface. To make a realistic prediction of the onset of pearlite (P)transformation, a normal distribution of γ grain size has been assumed and successive α→Ptransformation kinetics in each grain size have been summated.The developed program coupled with thermodynamic solver, 'ThermoCalc', calculated the isothermalkinetics of MCFS and has been found to predict well the effect of minor difference of chemicalcomposition / holding temperatures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2443.pdf
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