발간논문

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Vol.23, No.12, 1349 ~ 1356, 1985
Title
A Study on the Phase Transformations during Slow Cooling in a Dual Phase Steel
최병영Byung Young Choi, 김상주Sang Joo Kim
Abstract
Phase transformations during slow cooling after intercritical annealing for a short time have been investigated using Fe/l.6Mn/0.7Si/0.1C dual phase steel with initial structures of fine ferrite-pearlite as cold rolled state. It was observed by using scanning and transmission electron microscopes that the growth of austenite, formation of ferrite and pearlite transformation occurred in sequence during slow cooling from intercritical temperature. The scanning electron micrographs showed that austenite particles of submicron size were retained as a isolated type at the ferrite grain boundaries or inside of ferrite grains. Because of concentration gradient in an austenite grain, a part of the austenite was transformed into pearlite and the other region remained as austenite. As a result, the pearlite was located at the ferrite-martensite interface.
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