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Journal of KWJS 2004;22(4):50-58.
Published online September 15, 2004.
A Study on the High Temperature Tensile Property and the Characteristics of Residual Stress in Welds of High Strength Steels
Kyong-Ho Chang, Chin-Hyung Lee, Young-Eui Shin
Abstract
In this study, high temperature tensile properties of high strength steels(POSTEN60, POSTEN80) were investigated. The three-dimensional thermal elastic-plastic analyses were conducted to investigate the characteristics of welding residual stresses in welds of high strength steels on the basis of thermal and mechanical properites at high temperature obtained !Tom the experiment. According to the results, high temperature tensile strength of POSTEN60 steel deteriorated slowly to 100.C. As the temperature went up, the tensile strength became better because of blue shortness, and it deteriorated radically after reaching to the maximum value around 300'C. For the POSTEN80 steel, high temperature tensile strength deteriorated slowly to 200"(. As the temperature went up the tensile stren/:,rth became better and it deteriorated slowly to 600"C after reached to the maximum value around 300"C. Strain of high strengrth steels at the elevated temperature increased radically after the mercury rose to 600"C. The strain hardening ratio of POSTEN60 steel was larger then that of POSTEN80 steel at the elevated temperature as in the case at the room temperature and it became smaller radically after the mercury rose to 400"C. And, in the welding of high strength steels, increasing tensile strength of the steel (POSTEN60


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