双相区加速冷却处理对X80管线钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.03.027

金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 140-145.DOI: 10.13251/j.issn.0254-6051.2020.03.027

双相区加速冷却处理对X80管线钢组织与性能的影响

马静^1,2, 于柏青¹, 王申豪¹, 范利锋³

1. 河北科技大学材料科学与工程学院, 河北石家庄 050018;
2. 河北省材料近净成形技术重点实验室, 河北石家庄 050018;
3. 内蒙古大学交通学院, 内蒙古呼和浩特 010070

收稿日期:2019-09-26 出版日期:2020-03-25 发布日期:2020-04-03
通讯作者: 范利锋,副教授,博士,主要从事塑性成形及材料表征技术研究,E-mail:fanlifeng@imu.edu.cn
作者简介:马静(1973—),女,教授,博士,主要从事表面工程及腐蚀与防护研究,E-mail:majingt@qq.com。
基金资助:
国家自然科学基金(51761030,51701064)

Effect of dual phase accelerated cooling on microstructure and properties of X80 pipeline steel

Ma Jing^1,2, Yu Baiqing¹, Wang Shenhao¹, Fan Lifeng³

1. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China;
2. Hebei Key Laboratory of Material Near-Net Forming Technology, Shijiazhuang Hebei 050018, China;
3. School of Transportation, Inner Mongolia University, Hohhot Inner Mongolia 010070, China

Received:2019-09-26 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

采用双相区加速冷却法(加速冷却始冷温度为700 ℃)对X80管线钢进行热处理,获得了贝氏体和铁素体(B+F)双相组织。然后通过组织表征、力学性能测试以及在3.5wt%NaCl溶液中的耐蚀性进行研究。结果表明:热处理后获得的管线钢组织由板条状贝氏体、多边形铁素体及少量马氏体/奥氏体岛组成。与热处理前相比,(B+F)双相管线钢屈强比较低,为0.65,初始加工硬化指数为0.31,均匀伸长率达8.3%,塑性显著提升;双相组织中含有52.4%的铁素体,因而耐腐蚀性明显提高。通过双相区加速冷却法获得的(B+F)两相组织在塑变过程中发生协调变形,可以适应大变形的需求,同时耐蚀性优异,为大变形管线钢实际生产提供一定的借鉴。

关键词: 双相区加速冷却法, X80管线钢, B+F双相组织, 大变形, 均匀伸长率

Abstract:

X80 pipeline steel was heat treated by using dual phase accelerated cooling (the initial cooling temperature of the accelerated cooling was 700 ℃), and dual-phase structure of bainite and ferrite (B+F) was obtained. Microstructure characterization, mechanical properties test and corrosion resistance in 3.5 wt% NaCl solution were studied. The results show that the microstructure of pipeline steel after heat treatment is composed of lath bainite, polygonal ferrite and a small amount of martensite/austenite islands. The yield ratio and initial work hardening index of (B+F) dual-phase pipeline steel are 0.65 and 0.31, respectively. Compared with that of steel before heat treatment, the uniform elongation of pipeline steel after heat treatment is 8.3%, which indicates that the ductility is significantly improved. The corrosion resistance is also improved due to 52.4% amount of ferrite phase in the dual-phase structure. The coordinated deformation of (B+F) dual-phase structure obtained by dual-phase accelerated cooling during plastic deformation process can meet the needs of high deformation, and the corrosion resistance of the dual-phase structure is excellent, which provides some reference for the actual production of high deformation pipeline steel.

Key words: dual-phase accelerated cooling, X80 pipeline steel, B+F dual-phase structure, high deformation, uniform elongation

中图分类号:

TG156.3

马静, 于柏青, 王申豪, 范利锋. 双相区加速冷却处理对X80管线钢组织与性能的影响[J]. 金属热处理, 2020, 45(3): 140-145.

Ma Jing, Yu Baiqing, Wang Shenhao, Fan Lifeng. Effect of dual phase accelerated cooling on microstructure and properties of X80 pipeline steel[J]. HTM, 2020, 45(3): 140-145.

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双相区加速冷却处理对X80管线钢组织与性能的影响

Effect of dual phase accelerated cooling on microstructure and properties of X80 pipeline steel

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