曾燕屏,朱鹏宇,仝珂

• 1:北京科技大学材料科学与工程学院
• 2:中国石油集团石油管工程技术研究院

摘要(Abstract)：

采用扫描电镜、电子背散射衍射技术和常规力学性能测试等手段研究了两种X70管线钢的显微组织和力学性能。结果表明:管线钢的低温韧性不仅与其有效晶粒尺寸有关,而且还与其组织中的马奥岛和析出相有关;但是,与管线钢中大角度晶界所占的百分比没有直接的关系。有效晶粒尺寸越小,马奥岛和富钛氮化物数量越少、尺寸越小,管线钢的低温韧性就越好。富铌碳化物与高密度的位错和亚结构不仅能提高管线钢的屈服强度,而且还能增大其加工硬化速率,从而使其抗拉强度明显升高,屈强比减小。由此可见,通过显微组织的优化,可以得到高强度高韧性的管线钢。

关键词(KeyWords)： X70管线钢;显微组织;力学性能;有效晶粒尺寸;针状铁素体

Abstract:

Keywords:

基金项目(Foundation): 中国石油集团石油管工程技术研究院合作项目

作者(Author): 曾燕屏,朱鹏宇,仝珂

DOI: 10.13289/j.issn.1009-6264.2015.03.009

参考文献(References)：

• [1]Reip C P,Shanmugam S,Misra R D K.High strength microalloyed CMn(V-Nb-Ti)and CMn(V-Nb)pipeline steels processed through CSP thin-slab technology:Microstructure,precipitation and mechanical properties[J].Mater Sci Eng A,2006,424(1/2):307-317.
• [2]Shin S Y,Hwang B,Lee S,et al.Effects of notch shape and specimen thickness on drop-weight tear test properties of API X70 and X80 line-pipe steels[J].Metall Mater Trans A,2007,38(3):537-551.
• [3]Hwang B,Lee S,Kim Y M,et al.Analysis of abnormal fracture occurring during drop-weight tear test of high-toughness line-pipe steel[J].Mater Sci Eng A,2004,368(1/2):18-27.
• [4]Shukla R,Das S K,Ravi Kumar B,et al.An ultra-low carbon,thermomechanically controlled processed microalloyed steel:microstructure and mechanical properties[J].Metall Mater Trans A,2012,43(12):4835-4845.
• [5]Hwang B,Lee S,Kim Y M,et al.Correlation of rolling condition,microstructure,and low-temperature toughness of X70 pipeline steels[J].Metall Mater Trans A,2005,36(7):1793-1805.
• [6]Wang W,Yan W,Zhu L,et al.Relation among rolling parameters,microstructures and mechanical properties in an acicular ferrite pipeline steel[J].Mater Des,2009,30(9):3436-3443.
• [7]Yakubtsov I A,Poruks P,Boyd J D.Microstructure and mechanical properties of bainitic low carbon high strength plate steels[J].Mater Sci Eng A,2008,480(1/2):109-116.
• [8]Krauss G,Thompson S W.Ferritic microstructures in continuously cooled low-and ultralow-carbon steels[J].ISIJ Int,1995,35(8):937-945.
• [9]Shanmugam S,Misra R D K,Hartmann J,et al.Microstructure of high strength niobium-containing pipeline steel[J].Mater Sci Eng A,2006,441(1/2):215-229.
• [10]Zhao A M,Wang Y,Chen Y L,et al.Precipitation behaviors of X80 acicular ferrite pipeline steel[J].Int J Miner Metall Mater,2011,18(3):309-313.
• [11]Yu H,Sun Y,Chen Q X,et al.Precipitation behaviors of X70 acicular ferrite pipeline steel[J].J Univ Sci Technol Beijing,2006,13(6):523-527.
• [12]Kong J H,Zhen L,Guo B,et al.Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel[J].Mater Des,2004,25(8):723-728.
• [13]Lee W B,Hong S G,Park C G,et al.Influence of Mo on precipitation hardening in hot rolled HSLA steels containing Nb[J].Scripta Mater,2000,43(4):319-324.
• [14]Kim Y M,Kim S K,Lim Y J,et al.Effect of microstructure on the yield ratio and low temperature toughness of linepipe steels[J].ISIJ Int,2002,42(12):1571-1577.
• [15]Diaz-Fuentes M,Iza-Mendia A,Gutierrez I.Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction.Study of their toughness behavior[J].Metall Mater Trans A,2003,34(11):2505-2516.
• [16]Hwang B,Kim Y G,Lee S,et al.Effective grain size and Charpy impact properties of high-toughness X70 pipeline steels[J].Metall Mater Trans A,2005,36(8):2107-2114.

文章评论(Comment)：