Effect of bainite content on mechanical properties of ferrite/bainite(F/B) dual phase pipeline steel

doi:10.13251/j.issn.0254-6051.2021.01.034

Abstract

Abstract: A ferrite/bainite (F/B) dual-phase pipeline steel was heat treated at 700,720,740,and 760 ℃ in the dual-phase region and steel specimens with 4 different volume fractions (16%,28%,41%,48%)of bainite were obtained.The effect of volume fraction of bainite on the strength,plasticity and toughness of the steel was studied by using SEM,TEM and mechanical properties test.The results show that the F/B dual-phase microstructure has lower yield strength and comparable tensile strength,resulting in better strain capacity,namely,lower yield ratio,higher elongation and work hardening exponent compared with that of as-rolled original microstructure.The volume fraction of bainite has little effect on the strength,elongation and work hardening exponent for the F/B dual-phase pipeline steel,however,it plays an significant role in impact property.The excellent strength,plasticity and toughness can be obtained when the volume fraction of bainite is around 40%.

Key words: pipeline steel, ferrite/bainite, volume fraction of bainite, microstructure, mechanical properties

CLC Number:

TG142.31

Shi Xianbo, Yin Peihua, Yan Wei, Shan Yiyin, Ren Yi. Effect of bainite content on mechanical properties of ferrite/bainite(F/B) dual phase pipeline steel[J]. Heat Treatment of Metals, 2021, 46(1): 187-192.

References

[1] 高惠临.管线钢与管线钢管[M].北京:中国石化出版社,2012:10-11.
[2] 任毅,张帅,王爽,等.开冷温度对高性能海底管线用0.08C-1.5Mn-Nb钢组织性能的影响[J].金属热处理,2013,38(12):65-67.
Ren Yi,Zhang Shuai,Wang Shuang,et al.Effects of accelerate cooling temperature on microstructure and properties of marine pipeline 0.08C-1.5Mn-Nb steel with high properties[J].Heat Treatment of Metals,2013,38(12):65-67.
[3] 王良塑,段琳娜,贾书君,等.高性能海底管线钢的铁素体相变规律[J].金属热处理,2016,41(4):100-104.
Wang Liangsu,Duan Linna,Jia Shujun,et al.Ferrite transformation law of marine pipeline steel with high properties[J].Heat Treatment of Metals,2016,41(4):100-104.
[4] 牛爱军,罗卓辉,毕宗岳,等.深海管线用X70厚壁管线钢的组织及性能分析[J].焊管,2014,37(10):4-10.
Niu Aijun,Luo Zhuohui,Bi Zongyue,et al.Analysis on microstructure and properties of X70 pipeline steel with heavy wall thickness used for deep-sea pipeline[J].Welded Pipe and Tube,2014,37(10):4-10.
[5] 牛爱军,殷立洪,毕宗岳,等.深海用高强厚壁直缝埋弧焊管开发技术难点分析[J].焊管,2015,38(11):15-19.
Niu Aijun,Yin Lihong,Bi Zongyue,et al.Technical difficulties analysis on development of SAWL pipe used for deep-sea pipeline with high strength and heavy wall thickness[J].Welded Pipe and Tube,2015,38(11):15-19.
[6] Shi Xianbo,Yan Wei,Wang Wei,et al.Effect of microstructure on hydrogen induced cracking behavior of high deformability pipeline steel[J].Journal of Iron and Steel Research,International,2015,22(10):937-942.
[7] Zhang Xiaoyong,Gao Huilin,Zhang Xueqin,et al.Effect of volume fraction of bainite on microstructure and mechanical properties of X80 pipeline steel with excellent deformability[J].Materials Science and Engineering A,2012,531:84-90.
[8] Tang C,Shang C,Liu S,et al.Effect of volume fraction of bainite on strain hardening behavior and deformation mechanism of F/B multi-phase steel[J].Materials Science and Engineering A,2018,731:173-183.
[9] 王慧慧,宋开兰,左秀荣,等.厚规格多相组织X80管线钢的断裂行为[J].金属热处理,2019,44(8):228-235.
Wang Huihui,Song Kailan,Zuo Xiurong,et al.Fracture behavior of multi-phase heavy wall X80 pipeline steel[J].Heat Treatment of Metals,2019,44(8):228-235.
[10] 聂文金,尚成嘉,关海龙,等.铁素体/贝氏体(F/B)双相钢组织调控及其抗变形行为分析[J].金属学报,2012,48(3):298-306.
Nie Wenjing,Shang Chengjia,Guan Hailong,et al.Control of microstructures of ferrite/bainite (F/B) dual-phase steels and analysis of their resistance to deformation behavior[J].Acta Metallurgica Sinica,2012,48(3):298-306.
[11] Davies R G.Influence of Martensite composition content on the properties of dual phase steels[J].Metallurgical Transactions A,1978,9:671-679.
[12] Huper T,Endo S,Ishikawa N,et al.Effect of volume fraction of constituent phases on the stress-strain relationship of dual phase steels[J].ISIJ International,1999,39(3):288-294.
[13] Ji L,Li H,Wang H,et al.Influence of dual-phase microstructures on the properties of high strength grade line pipes[J].Journal of Materials Engineering and Performance,2014,23:3867-3874.
[14] Shi Xianbo,Yan Wei,Yang Zhenguo,et al.Effect of Cu alloying on strain capacity of Cu-bearing pipeline steels[J].ISIJ International,doi:org/10.2355/isijinternational.ISIJINT-2019-499.
[15] Korzekwa D A,Matlock D K,Krauss G.Dislocation substructure as a function of strain in a dual-phase steel[J].Metallurgical and Materials Transactions A,1984,15:1221-1228.