E690海洋平台用钢的高温塑性研究 |
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E690 海洋平台用钢的高温塑性研究
唐晶 ; 赖朝彬 ; 陈英俊 ; 孙乐飞 ; 刘敏
【摘
要】 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。 %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 ob tained. 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 betwe en 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.
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