발간논문

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Vol.18, No.2, 122 ~ 132, 1980
Title
Structure and Mechanical Properties of 0.25C - Ni - Cr - Mo- V Steel
강찬형Chan Hyoung Kang, 맹선재Sun Chae Maeng
Abstract
Tensile properties and impact toughness of 0.25C-2.5Ni-2.5Cr-0.5Mo-0.1V steel have been studied in relation to three different transformation structures of martensite, mixed structure of 50% martensite+50% lower bainite, and lower bainite. Mixed structure has shown higher tensile and yield strength than any of the single structure of martensite or lower bainite, when they have been tempered at 230℃ and 350℃. As the tempering temperature increases, strength of the martensite and that of the mixed structure have decreased gradually. But lower bainite structure has shown the decrease of strength only by increasing the tempering temperature above about 400℃. Impact toughness of the three structures has been tested after tempering at 450℃ for 40 min to the same ultimate tensile strength level of 145㎏/㎟ . Martensite structure has shown the highest impact toughness. Test resultes of tensile properties and impact toughness are discussed in connection with electron microscopic structure.
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