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

doi:10.13251/j.issn.0254-6051.2020.03.027

Abstract

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

CLC Number:

TG156.3

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.

References

[1]高惠临, 张骁勇. 大变形管线钢的研究和开发[J]. 焊管, 2014, 37(4): 14-21.
Gao Huilin, Zhang Xiaoyong. Research and development of large deformability pipeline steels[J]. Welded Pipe and Tube, 2014, 37(4): 14-21.
[2]张鹤松, 康永林, 孟德亮, 等. X80抗大变形管线钢的生产工艺与组织性能研究[J]. 中国冶金, 2012, 22(9): 10-14.
Zhang Hesong, Kang Yonglin, Meng Deliang, et al. Research on processing, microstructure and properties of X80 high-deformability pipeline steel[J]. China Metallurgy, 2012, 22(9): 10-14.
[3]陈凯, 晏利君, 刘宇, 等. X70大变形管线钢管的组织和性能[J]. 机械工程材料, 2013, 37(9): 21-24.
Chen Kai, Yan Lijun, Liu Yu, et al. Microstructure and properties of X70 high deformability linepipe[J]. Materials for Mechanical Engineering, 2013, 37(9): 21-24.
[4]赵鹏翔, 左秀荣, 陈康, 等. X80大变形管线钢的腐蚀行为[J]. 材料热处理学报, 2013, 34(S2): 221-226.
Zhao Pengxiang, Zuo Xiurong, Chen Kang, et al. Corrosion behavior of X80 pipeline steel with strain-based design[J]. Transactions of Materials and Heat Treatment, 2013, 34(S2): 221-226.
[5]Liu Ligang, Xiao Hong, Li Qiang, et al. Evaluation of the fracture toughness of X70 pipeline steel with ferrite-bainite microstructure[J]. Materials Science and Engineering A, 2017, 688: 388-395.
[6]刘文月, 任毅, 高红, 等. F-B型大变形管线钢的研究进展及发展方向[J]. 宽厚板, 2016, 22(5): 25-28.
Liu Wenyue, Reng Yi, Gao Hong, et al. Research progress and development trend of F-B type high deformability pipeline steel[J]. Wide and Heavy Plate, 2016, 22(5): 25-28.
[7]张丹, 刘雅政, 周乐育, 等. 分段冷却工艺对微合金铁素体-贝氏体双相钢组织和性能的影响[J]. 机械工程材料, 2012, 36(11): 50-53.
Zhang Dan, Liu Yazheng, Zhou Leyu, et al. Effect of step-cooling process on structures and properties of microalloy ferrite-bainite dual-phase steels[J]. Materials for Mechanical Engineering, 2012, 36(11): 50-53.
[8]孟德亮, 康永林, 郑晓飞, 等. 两阶段控制冷却工艺对含钼X80抗大变形管线钢组织与性能的影响[J]. 北京科技大学学报, 2011, 33(7): 834-840.
Meng Deliang, Kang Yonglin, Zheng Xiaofei, et al. Effect of two-stage controlled cooling on the microstructure and properties of Mo-containing X80 high-deformability pipeline steel[J]. Journal of University of Science and Technology Beijing, 2011, 33(7): 834-840.
[9]马晶, 张骁勇, 程时遐, 等. 基于临界区加速冷却的(B+F)X80大变形管线钢的组织和性能研究[J]. 材料导报, 2014, 28(2): 118-122.
Ma Jing, Zhang Xiaoyong, Chen Shixia, et al. Study on microstructure and properties of (B+F) X80 large deformation pipeline steel after critical zone accelerated cooling[J]. Materials Review, 2014, 28(2): 118-122.
[10]樊学华, 李向阳, 董磊, 等. 国内抗大变形管线钢研究及应用进展[J]. 油气储运, 2015, 34(3): 237-243.
Fan Xuehua, Li Xiangyang, Dong Lei, et al. Progress in research and application of pipeline steels with high deformation resistance in China[J]. Oil and Gas Storage and Transportation, 2015, 34(3): 237-243.
[11]姚梦佳, 李春福, 肖淇, 等. 不同马氏体含量的F/M双相钢组织及形变行为[J]. 金属热处理, 2015, 40(8): 49-54.
Yao Mengjia, Li Chunfu, Xiao Qi, et al. Microstructure and deformation behavior of F/M dual phase steel with different content of martensite[J]. Heat Treatment of Metals, 2015, 40(8): 49-54.
[12]Ishikawa N, Yasuda K, Sueyoshi H, et al. Microscopic deformation and strain hardening analysis of ferrite-bainite dual-phase steels using micro-grid method[J]. Acta Materialia, 2015, 97: 257-268.
[13]于庆波, 孙莹, 倪宏昕, 等. 不同类型的贝氏体组织对低碳钢力学性能的影响[J]. 机械工程学报, 2009, 45(12): 284-288.
Yu Qingbo, Sun Ying, Ni Hongxin, et al. Effect of different bainitic microstructures on the mechanical properties of low-carbon steel[J]. Journal of Mechanical Engineering, 2009, 45(12): 284-288.
[14]Wang Y X, Zhao W M, Ai H, et al. Effects of strain on the corrosion behaviour of X80 steel[J]. Corrosion Science, 2011, 53(9): 2761-2766.
[15]杨鸿铭. 冷速对低碳钢先共析铁素体生长行为的影响[D]. 锦州: 辽宁工业大学, 2014.
[16]Tan Fengliang, Liu Qingyou, Lei Ting, et al. Ferrite evolution during isothermal process in a high deformability pipeline steel[J]. Journal of Iron and Steel Research, International, 2013, 20(7): 89-93.
[17]邓伟, 高秀华, 秦小梅, 等. 冷却速率对变形与未变形X80管线钢组织的影响[J]. 金属学报, 2010, 46(8): 959-966.
Deng Wei, Gao Xiuhua, Qing Xiaomei, et al. Effect of cooling rate on microstructure of deformed and undeformed X80 pipeline steels[J]. Acta Metallurgica Sinica, 2010, 46(8): 959-966.