Microstructure and Deformation Mechanics of X100 Line Pipe Steel

作     者：LI Yang 1,2,MENG Li 1,JI Ling-kang 2,LI He-lin 2 (1.School of Material Science and Egineering,University of Sceince and Technology Beijing,Beijing 100083,China 2.CNPC Tubular Goods Research Institute,Xi’an 710065,China) 

作者机构：Univ Sci & Technol Beijing Sch Mat Sci & Egineering Beijing 100083 Peoples R China CNPC Tubular Goods Res Inst Xian 710065 Peoples R China 

出 版 物：《Journal of Iron and Steel Research International》 (钢铁研究学报(英文版))

年 卷 期：2011年第18卷第S1期

页      面：255-261页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the 2010 Oil Tube Application Research Program of China National Petroleum Corporation 

主　　题：X100 line pipe acicular Ferrite M/A grain boundary misorientation 

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 *** 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 *** 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 *** 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 *** 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.