Mechanism of Microstructure Evolution in Low Carbon Steels by Flash Processing

doi:10.12068/j.issn.1005-3026.2015.11.011

Abstract

Abstract: The mechanism of microstructure evolution of low carbon steels Q195 and CR340 during flash processing was studied by utilizing hot simulation device. The results indicated that complex microstructure consisting of martensite， bainite， ferrite and undissolved cementite was observed in the early stage of flash processing. The average concentration of carbon increases owing to the gradual dissolution of undissolved cementite， leading to the decrease of carbon concentration in austenite grain. Finally， the relative amount of martensite increases， and the microstructure is wholly comprised of lath martensite. Comparing with the traditional quenching process， flash processing can significantly refine grain size of experimental steels. Simultaneously， the role of grain refinement will become more obvious by increasing heating rate.

Key words: flash processing, low carbon steel, microstructure evolution, austenite, concentration of carbon

CLC Number:

TG156

LU Ri-huan， LIU Xiang-hua， YAN Shu， LIU Li-zhong. Mechanism of Microstructure Evolution in Low Carbon Steels by Flash Processing[J]. Journal of Northeastern University Natural Science, 2015, 36(11): 1567-1571.

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