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Abstract
Abstract This article presents a study on the tensile properties of hypoeutectoid steels with different ferrite-pearlite microstructures. Nine kinds of hypoeutectoid steel specimens were fabricated by varying carbon contentand isothermal transformation temperature. The microstructural factors such as ferrite & pearlite fraction, inter-lamellar spacing, and cementite thickness were quantitatively measured and then tensile tests were carried outon the specimens in order to investigate the correlation of the microstructural factors with strength and ductility.The pearlite volume fraction usually increased with decreasing transformation temperature, while the pearliteinterlamellar spacing and cementite thickness decreased mostly with decreasing transformation temperature, irre-spective of carbon content. The tensile test results showed that the yield and tensile strengths of all the steelspecimens increased and their ductility was also improved as the transformation temperature decreased. For thesteel specimens investigated, the difference in the transformation temperature dependence of strength and duc-tility could be explained by the fact that the variation in pearlite fraction with transformation temperature notice-ably affected various microstructural factors such as pearlite interlamellar spacing and cementite thicknessassociated with pearlite fracture mechanism such as void initiation, cementite necking, and cracking. (Received December 17, 2015; Revised December 24, 2015; Accepted December 30, 2015)Key words : Hypoeutectoid steels, Ferrite-pearlite structure, Microstructural factor, Strength, Ductility
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