발간논문

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Vol.25, No.9, 657 ~ 665, 1987
Title
Effect of Pearlite on the Yielding and Deformation behavior of a Dual Phase Steel
최병영Byung Young Choi, 오상엽Sang Yeob Oh
Abstract
The dual phase steels of ferrite-martensite and ferrite-martensite-pearlite were prepared by two step cooling or isothermal holding after intercritical annealing. And this research investigated the effect of pearlite on the yielding and deformation behavior of these dual phase steels. It was observed that second phase particles with pearlite-martesite interfaces were distributed in the ferrite matrix. The structure of pearlite-martensite interface was also observed by using SEM. Continuous or discontinuous yielding apeared in the specimens of ferrite-martensite-pearlite. The lower yielding ratio and continuous yielding were shown in the specimens with more martensite content (≥5.8 vol%). The microstructure observed by TEM showed that the mobile dislocations causing continuous yielding and the pinned dislocations by solute atoms were distributed in the ferrite. The effect of pearlite on the variation of work hardening exponents during tensile deformation was also discussed in terms of the Modified Crussard-Jaoul analysis.
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