발간논문

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Vol.40, No.3, 252 ~ 260, 2002
Title
Research Papers / Mechanical Behaviors : Effects of Alloying Elements on Microstructure and Mechanical Properties of Low Carbon steels Quenched and Tempered by Induction Heating
안순태Soon Tae Ahn,조경목Kyung Mox Cho,이상래Sang Lae Lee
Abstract
Microstructure and mechanical properties of 0.2%C steels tempered employing induction heating method were investigated in this study. Effect of alloying elements on tempered microstructure with a variation of tempering temperature was examined. Tensile properties and impact strength of tempered steels were estimated to compare steels with and without alloying elements. The evolution of microstructure of tempered steels revealed the precipitation of acicular carbides with particular orientations and the precipitation and growth of spherical cementite particles with increasing tempering temperature. The process of the microstructural evolution was found to be delayed by addition of alloying elements Cr and Mo. Yield and tensile strength decreased with increasing tempering temperature. Reduction of area and total elongation increased with increasing tempering temperature. Impact strength increased with increasing tempering temperature. All these mechanical properties were closely related to the microstructural evolution of the steels. It was concluded that proper mechanical properties could be obtained for carbon steels without addition of alloying element by controlling tempering temperature using induction heating method.
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