CAJ | 학술논문

在Gleeble-3800热应力-热模拟实验机上对某钢厂生产的E690海洋平台用钢连铸坯进行高温力学性能测试，得到了600~1350℃的高温强度和高温塑形曲线图。实验结果表明：随着拉伸温度的升高，实验用钢的抗拉强度逐渐降低，高温塑性良好，高塑性区较宽，本实验用钢800~950℃时有一个塑性低谷，为第3脆性区。金相显微镜和扫描电镜观察得知：本试样钢在1300℃以下范围内以穿晶断裂为主，1300~1350℃时，试样以熔融断裂为主，表明钢的高塑性区范围较宽，高温塑性良好。
재Gleeble-3800열응력-열모의실험궤상대모강엄생산적E690해양평태용강련주배진행고온역학성능측시，득도료600~1350℃적고온강도화고온소형곡선도。실험결과표명：수착랍신온도적승고，실험용강적항랍강도축점강저，고온소성량호，고소성구교관，본실험용강800~950℃시유일개소성저곡，위제3취성구。금상현미경화소묘전경관찰득지：본시양강재1300℃이하범위내이천정단렬위주，1300~1350℃시，시양이용융단렬위주，표명강적고소성구범위교관，고온소성량호。
The high-temperature mechanical properties of offshore platform continuous casting steel slabs E690 were tested on thermal stress-thermal simulation device (Gleeble-3800) and the high-temperature strength curve and high-temperature ductility curve from 600 ℃ to 1 350 ℃ was obtained. Results show that with the increase of stretching temperature, the tensile strength of the experimental samples decreases; the high-temperature ductility becomes better, and the high ductility region gets wider. A ductility trough is observed between 800 ℃ and 950 ℃ which is the third brittle zone. Metalloscope and scanning electron microscope were used to observe the situation of brittle fracture. The results show that transgranular fracture dominates below 1 300 ℃, while melting fracture dominates with the temperature from 1 300~1350 ℃, which means that the high ductility region is wide and the high-temperature plastic is fine.