발간논문

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Vol.35, No.4, 405 ~ 412, 1997
Title
Effect of Aging Treatment on the Mechanical Properties of Cu-bearing Hot Rolled Steel Sheets
민재상 , 조열래 , 김인배 Jae Sang Min , Yeol Rae Cho , In Bae Kim
Abstract
Effects of the aging treatment on the mechanical properties of 0.5-2.0% Cu-added hot rolled steel sheets were investigated by Vickers hardness measurement, tensile test and scanning and transmission electron microscopy. The hardness of the specimen coiled at 450℃ was greater than that of 650℃. As increasing Cu contents, the hardness increased and the time to reach peak hardness decreased. It was also found that the aging at 550℃ led to the maximum hardness for all composition. The maximum tensile strength of 1.0, 1.5 and 2.0% Cu-bearing steels aged at 550℃ was 553. 679 and 766㎫ respectively. It was confirmed by TEM observation that Cu-clusters were finely dispersed throughout the grain inside. The size of Cu-clusters was about 10-20㎚ at peak-aged condition.
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