电力铁塔专用Q420角钢性能研究
Study on Performance of Q420 Angle Iron for Power Tower
黄伟兵1, 朱正吼1, 谢飞鸣2, 刘三秋1
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作者单位：(1. 南昌大学 材料科学与工程学院, 江西 南昌 330031; 2. 南昌长力钢铁股份有限公司, 江西 南昌 330012)
中文关键字：角钢； 终轧温度； 低温韧性
英文关键字：angle iron; finishing temperature; low-temperature toughness
中文摘要：采用三组不同成分的Q420角钢做常温拉伸试验、低温冲击试验，其中两组成分试验作为一组成分的对比。 由三种不同成分的拉伸试验结果与金相组织可知： 一组成分的含钒量增加， 晶粒细化，从而强度增大。其中一组成分角钢又分为四种不同终轧温度， 通过实验研究终轧温度对角钢低温韧度的影响。结果表明：随着终轧温度的降低，角钢的冲击韧度逐渐降低； 在860 ℃终轧温度低温冲击韧度达到最大，而986 ℃终轧温度的最小；用电子扫描显微镜对四种不同终轧温度角钢在-40℃低温冲击试验的断口进行分析，从SEM断口形貌照片中可知： 终轧温度为857和873℃角钢-40 ℃低温下发生韧性断裂；终轧温度为924和986 ℃角钢发生脆性断裂，与低温冲击试验结果相符合。
英文摘要：The tensile strength and low-temperature impact of three kinds of Q420 angle irons with different composition were carried out, two results of them were taken as a contrast to another. The testing results and their microstructure show that the one with a higher vanadium content and smaller crystal grain has a high strength. The other with different finishing temperature was tested to study the influence of finishing temperature on its low-temperature flexibility. The results show that, with the decrease of finishing temperature, the low-temperature impact ductility decreases gradually. And the low-temperature flexibility is highest at finishing temperature of 860 ℃ and lowest at finishing temperature of 986 ℃. The fracture morphologies of four angle irons with different finishing temperature after impacted at -40 ℃ were analyzed by SEM. The results show that there is a ductile fracture at 857 ℃ and 873 ℃, brittle fracture at 924 ℃ and 986 ℃, which is in accord with the data of impact ductility test.