显微组织对大厚度X65抗酸管线钢板低温落锤性能的影响

doi:10.13251/j.issn.0254-6051.2025.12.011

摘要/Abstract

摘要： 利用金相显微镜(OM)、扫描电镜(SEM)、背散射衍射(EBSD)和落锤撕裂试验(DWTT)等技术,对X65抗酸管线钢板沿轧制方向头部、中部和尾部的组织变化规律及其对DWTT性能影响进行了研究。结果表明,－45 ℃条件下,X65抗酸管线钢板可满足DWTT剪切面积比例≥85%的要求。但－50 ℃条件下,头部、中部和尾部的DWTT剪切面积分别为77%、21%和85%,表明X65抗酸管线钢板尾部韧性最好,头部次之,中部最差。钢板头部显微组织主要为针状铁素体,多边形铁素体较少;中部不同组织占比较为接近,还存在少量珠光体;尾部主要为粒状贝氏体,其他组织占比较少。钢板的头部至尾部,平均有效晶粒尺寸逐渐增大,小角度晶界占比和变形回复晶粒数量先上升后下降。高比例的针状铁素体与粒状贝氏体,以及细小的晶粒尺寸均有利于阻碍裂纹扩展,提高DWTT性能。

关键词: X65管线钢, DWTT性能, 组织

Abstract: Evolution of microstructure and drop-weight tear test (DWTT) property of X65 acid-resistant pipeline steel plate at the different sites of the head, the middle and the tail along the rolling direction were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and DWTT techniques. The results indicate that at -45 ℃, the steel meets the requirement of DWTT shear area ≥ 85%. However, at -50 ℃, the shear areas of the head, middle, and tail are 77%, 21% and 85%, respectively, revealing superior toughness in the tail, followed by the head, while the middle exhibits the poorest toughness. The main microstructure of the steel plate head is acicular ferrite, with a small amount of polygonal ferrite; the proportions of different microstructures in the middle part are relatively close, and a small amount of pearlite is also present; the main microstructure of the tail part is granular bainite, with a small proportion of other microstructure. From the head to the tail of the steel plate, the average effective grain size gradually increases, the proportion of low-angle grain boundaries and the number of deformed and recovered grains first increase and then decrease. A high fraction of AF and GB, combined with fine grain size, contributes to inhibiting crack propagation and improving DWTT property.

Key words: X65 pipeline steel, DWTT property, microstructure

中图分类号:

TG142.1

王晓东, 张继明, 朱延山, 胡显军. 显微组织对大厚度X65抗酸管线钢板低温落锤性能的影响[J]. 金属热处理, 2025, 50(12): 70-76.

Wang Xiaodong, Zhang Jiming, Zhu Yanshan, Hu Xianjun. Effect of microstructure on low-temperature DWTT property of thick X65 acid-resistant pipeline steel plate[J]. Heat Treatment of Metals, 2025, 50(12): 70-76.

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