Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steel

作     者：Hao Yu 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2008年第15卷第6期

页      面：683-687页

核心收录：

学科分类：08[工学] 0823[工学-交通运输工程] 

主　　题：pipeline steel acicular ferrite microstructure texture crack propagation 

摘      要：The aspects of two pipeline steels with different technologies were investigated by using transmission electron microscopy （TEM） and electron back-scattered diffraction （EBSD）. The microstructure presents a typical acicular ferrite characteristic with fine particles of martensite/austenite （M/A） constituent, which distributes in grains and at grain boundaries. The bulk textures of the pipeline steel plate are {112}〈110〉 and 〈111〉 fibers, respectively, and the {112}〈110〉 component is the favorable texture benefiting for drop weight tear test. Moreover, low angle boundaries and low coincidence site lattice boundaries are inactive and more resistant to fracture than high energy random boundaries.