발간논문

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Vol.35, No.3, 297 ~ 305, 1997
Title
Research Paper - Transformations : A Study on the Formation of Retained Austenite , and Tensile Properties in the Fe - Mn - Si - P Steel
문원진Won Jin Moon, 강창용Chang Yong Kang, 성장현Jang Hyun Sung
Abstract
Formation of retained austenite and tensile properties of austempered Fe-Mn-Si-P steel after intercritically annealing the initially normalized specimen have been investigated. Two type of retained austenite, film and granular, were observed. The retained austenite of film type existing between the bainitic ferrite lath increased with increase of intercritical annealing temperature. The isolated granular type increased with increase of austempering temperature. With decrease of intercritical annealing temperature and increase of time, retained austenite and carbon contents increased, contents of retained austenite and carbon were shown with increasing austempering time. Due to the removal of martensite and increment of retained austenite contents, tensile strength decreased and elongation increased with increasing austempering time up to 5 min. The TS×El value increased with increase of austempering time and retained austenite concents. The maximum TS×El value of TS×El 3000 above obtained at the retained austenite of 12% and the austempering temperature of 400℃
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