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In order to study the thermal stability of the lamellar eutectioid structure, spheroidization of two kinds of lamellar pearlite(the pearlite in a Fe-C system and delta-pearlite in a Fe-Cr system obtained by carburization) by annealing at temperatures ...
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RISS 인기검색어
부가정보
다국어 초록 (Multilingual Abstract)
In order to study the thermal stability of the lamellar eutectioid structure, spheroidization of two kinds of lamellar pearlite(the pearlite in a Fe-C system and delta-pearlite in a Fe-Cr system obtained by carburization) by annealing at temperatures between 500-700 ℃ and 1100-1200 ℃ has been investigated by a quantitative microscopy. The rate of spheroidization could be described by a cubic law ; (1/S)³-(1/S_0)³=κt, where S is the total area of the interface between the ferrite and cementite per unit volume and So is the initial value. The rate constant κis approximated by κ=k₃/(3f)³, where k₃is the rate constant in the Ostwald ripening of cementite particles and f is the volume fraction of cementite. Small addition of Cr remarkably retarded the spheroidization. This effect was mainly due to the large distribution coefficient between the ferrite and cementite.
In order to study the thermal stability of the lamellar eutectioid structure, spheroidization of two kinds of lamellar pearlite(the pearlite in a Fe-C system and delta-pearlite in a Fe-Cr system obtained by carburization) by annealing at temperatures between 500-700 ℃ and 1100-1200 ℃ has been investigated by a quantitative microscopy. The rate of spheroidization could be described by a cubic law ; (1/S)³-(1/S_0)³=κt, where S is the total area of the interface between the ferrite and cementite per unit volume and So is the initial value. The rate constant κis approximated by κ=k₃/(3f)³, where k₃is the rate constant in the Ostwald ripening of cementite particles and f is the volume fraction of cementite. Small addition of Cr remarkably retarded the spheroidization. This effect was mainly due to the large distribution coefficient between the ferrite and cementite.
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