Microstructure and Mechanical Properties of Nb-microalloyed X100 High Deformability Pipeline Steel

摘要：

A low carbon Nb-microalloyed high deformability pipeline steel with X100 grade has been processed by TMCP and followed two-stage cooling process. The microstructure is characterized by ferrite/bainite multiphase. The effective grain size is 1.85μm in average. The volume of ferrite is about 10-15％ and the grains sizes are mostly less than 5μm. The bainite consists of granular-bainite and lath-bainite, with M/A islands finely dispersed. The longitudinal tensile yield strength, uniform elongation, yield ratio are 647MPa, 7.6％ and 0.78, respectively. Ferrite/bainite multiphase have large strain hardenability that resulting high strength and high deformability combination. Precipitation of Nb also improves the strength and uniform deformability by precipitation strengthening and grain refinement.

关键词： pipeline steel high deformability high strength microalloyed steel strain based design

作者: MENG De-liang KANG Yong-lin AN Shou-yong XIA Dian-xiu SUN Hao ZHENG Xiao-fei

作者单位: School of Materials Science and Engineering, University of Science and Technology Beijing,Beijing,10 Technology Center of Jinan Iron & Steel Co.,LTD., Jinan,250101,China

会议类型: 国际会议

会议名称: The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

会议地点: 北京

会议语种:英文

页码: 727-730

在线出版日期: 2011-05-31（万方平台首次上网日期，不代表论文的发表时间）