X90级别第三代管线钢的力学性能与组织特征

夏佃秀; 王学林; 李秀程; 由洋; 尚成嘉

doi:10.3724/SP.J.1037.2012.00480

金属学报 >

2013 , Vol. 49 >Issue 3: 271 - 276

DOI: https://doi.org/10.3724/SP.J.1037.2012.00480

论文

X90级别第三代管线钢的力学性能与组织特征

夏佃秀 ,
王学林 ,
李秀程 ,
由洋 ,
尚成嘉

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1) 北京科技大学材料科学与工程学院, 北京 100083
2) 济钢集团有限公司技术中心, 济南 250101
3) 江苏省 (沙钢) 钢铁研究院, 张家港 215625

夏佃秀, 女, 1968年生, 博士生

网络出版日期: 2013-03-11

基金资助

国家重点基础研究发展计划资助项目2010CB630801

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PROPERTIES AND MICROSTRUCTURE OF THIRDGENERATION X90 PIPELINE STEEL

XIA Dianxiu ,
WANG Xuelin ,
LI Xiucheng ,
YOU Yang ,
SHANG Chengjia

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1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2) Technology Center, Jinan Iron & Steel Group Company, Limited, Jinan 250101

3) Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625

Online published: 2013-03-11

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摘要

对工业实验生产的X90级第三代管线钢的力学性能与组织特征进行了研究. 结果表明, 工业试生产的18.4 mm厚X90管线钢板微观组织是以准多边形铁素体、板条贝氏体及其中的M/A (马氏体/奥氏体) 为主的多相组织. 钢板的屈服强度达到615-660 MPa, 抗拉强度达到720 MPa以上, 屈强比不大于0.9, -30 ℃冲击功达到200 J, -15 ℃落锤撕裂实验 (DWTT)韧性剪切面积大于80%. 实验钢中“软相”(准多边形铁素体) 与“硬相” (板条贝氏体) 的比例约为3∶2, 板条贝氏体组织位错密度高, 而准多边形铁素体的位错密度较低. EBSD结果表明, 工业实验钢“硬相”组织中的板条之间呈现切变转变特征, 已达到软硬相多相组织的调控效果.

关键词： 第三代管线钢; 多相组织; X90; 力学性能

本文引用格式

夏佃秀 , 王学林 , 李秀程 , 由洋 , 尚成嘉 . X90级别第三代管线钢的力学性能与组织特征[J]. 金属学报, 2013 , 49(3) : 271 -276 . DOI: 10.3724/SP.J.1037.2012.00480

Abstract

The mechanical properties and microstructure of the TG (third generation) X90 pipeline steelswhich have been industrially trial-produced were investigated. The results showed that the microstructure of the18.4 mm thick X90 pipeline steels consist of quasi-polygonal ferrite, lath bainite and M/A (martenite/austenite) island. The yield strength was between 615 and 660 MPa, and the tensile strength was above 720 MPa, and theyield ratio was below 0.9, the impact absorbed energy at --30 ℃ was over 200 J, and the shearing area ofdrop-weight tear test (DWTT) at -15 ℃ was more than 80%. The ratio of the soft phase (quasi-polygonal ferrite)and the hard phase (lath bainite) was about 3∶2, and the dislocation density in the lath bainite was higher, whilethat in the quasi-polygonal ferrite was lower. The EBSD results showed that the lath of the hard phase met theshear transformation characteristics, indicating that the effect of microstructure control on hard and soft phase has been achieved.

Key words： third generation pipeline steel; multi-phases; X90; mechanical property

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