Microstructure Characteristics and Mechanical Properties of X80 Pipeline Steels
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2012年第2期
论文作者：周民
文章页码：252 - 255
摘 要：The relation between microstructure characteristics and mechanical properties of X80 pipeline steels was investigated using optical microscopy,scanning electron microscopy,etc.It is shown that the structure consists of polygonal ferrite（PF）,quasi-polygonal ferrite（QPF）,acicular ferrite（AF）,and granular bainitic ferrite（GF）.With increasing volume fraction of M-A islands（below 3%）,the yield strength increases.With increasing content of higher angle grain boundaries（HAGBs）,the yield strength,elongation,and DWTT properties at-15 ℃ increase,and the volume fraction of M-A islands reaches its highest point in the steel containing the most volume fraction of GF.
周民
State Key Lab of Rolling Technology and Automation,Northeastern University
摘 要：The relation between microstructure characteristics and mechanical properties of X80 pipeline steels was investigated using optical microscopy,scanning electron microscopy,etc.It is shown that the structure consists of polygonal ferrite（PF）,quasi-polygonal ferrite（QPF）,acicular ferrite（AF）,and granular bainitic ferrite（GF）.With increasing volume fraction of M-A islands（below 3%）,the yield strength increases.With increasing content of higher angle grain boundaries（HAGBs）,the yield strength,elongation,and DWTT properties at-15 ℃ increase,and the volume fraction of M-A islands reaches its highest point in the steel containing the most volume fraction of GF.
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