Microstructure and Deformation Mechanics of X100 Line Pipe Steel

摘要：

In present paper, microstructure is observed by means of OM, SEM, EBSD and TEM analysis on material obtained from X100 linepipe with wall thickness as 20.6mm and outside diameter as 1016mm diameter Grade 690. To study the deformation mechanics, microstructure transformation is also investigated on deformed specimens with different strain level as 0％, 5％ and 8％.Results show that X100 line pipe material consists mainly of acicular ferrite whose ratio in material reaches 64％, obvious cellular structures formed by tangled dislocation and M/A island distributed in acicular plates indicate abundant dislocation and substructure existed in material. It is measured that line pipe steel has a much finer effective grain size as 2.07μm, which can results in a higher strength and toughness for line pipe steel. Contrast analysis for Kikuchi Pattern reveals that the ratio of large-angle boundary is comparatively higher as 55％, implying that line pipe steel has a good toughness. It is observed that the proportion of small-angle grain boundary increases greatly after material deformed, which consequently results in the increment of dislocation and sub-structure.

关键词： X100 line pipe Acicular Ferrite M/A Grain boundary Misorientation

作者: LI Yang MENG Li JI Ling-Kang LI He-Lin

作者单位: School of Material Science and Egineering, University of Sceince and Technology Beijing, Beijing 100 School of Material Science and Egineering, University of Sceince and Technology Beijing, Beijing 100 CNPC Tubular Goods Research Institute, Xi’an 710065, 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: 878-884

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）