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Vol.26, No.1, 23 ~ 29, 1988

Title

Effect of Bainite on the Microstructure and Mechanical Properties of Ferrite - Martensite - Bainite Steels

정희원Hee Won Cheong, 최병영Byung Young Choi, 김인섭In Sup Kim, 김상주Sang Joo Kim

Abstract

The effect of volume fraction and morphology of bainite on the microstructure and mechanical properties of Fe-0.1C-1.6Mn-0.8Si tri-phase (ferrite-bainite-martensite) steels was investigated. The volume fraction and morphology of bainite were controlled by isothermal holding for different periods at two levels of bainite transformation temperature before quenching in water. The size of martensite particles became finer with increasing volume fraction of bainite in the tri-phase steel. Lower bainite and upper bainite were observed in the tri-phase steel by transmission electron microscopy. The improvement in ductility (elongation and reduction of area) with increasing volume fraction of bainite in the tai-phase steel was attributed to dispersion of fine martensite particles and less hard bainite, that resulted in higher work hardening and relaxation of stress concentration.

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