발간논문

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Vol.18, No.3, 191 ~ 201, 1980
Title
The effect of thermomechanical Treatment on the strength and toughness of structural steel
권종상Jong Sang Kwon, 송진태Jin Tae Song
Abstract
An investigation was carried out on the effect of high temperature thermomechanical treatment (HTMT) on the strength and toughness of AISI 4340 steel. HTMT was carried out at 850℃ which is in the lower temperature range of the stable austenized region, and the degree of working was between 0% and 58%. The tempering temperature was between 250℃ and 650℃ including room temperature and microstructures of specimens were observed by optical microscope, transmission electron microscope(TEM), and scanning electron microscope (SEM). The results showed that HTMT increased the strength and toughness of steel compared to conventional heat-treatment and produced the subgrain structures which become finer with increasing degree of working and tempering temperature. It seems that the improvement in strength and toughness of this steel resulting from HTMT is attributed to the formation of subgrain structure, and the refinement of structure is the predominent factor contributing to improved strength and toughness of the steels tempered at 550℃.
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