【摘要】 利用单轴压缩-拉伸试验研究了炉卷轧机生产X80/X100管线钢不同变形情况下的包辛格效应.结果表明:随着预压缩变形量的增大,包辛格效应绝对值增大,X100管线钢的包辛格效应在1.5%的预压缩变形量下达到饱和;包辛格效应绝对值随着板卷强度的提高而上升;在试验范围内,X80、X100管线钢分别表现出了瞬时软化和永久软化.分析X80/X100管线钢的化学成分与显微组织特点,认为管线钢组织中的软、硬相(如M/A岛)的强度差、硬相的体积分数以及初始组织中的位错密度是不同包辛格现象的关键因素.更多还原

【Abstract】 The Bauschinger effect of X80/X100 pipeline steels produced with a Steckel mill was investigated using uniaxial compression-tensile experiments under different deformation conditions.The results show that the absolute value of Bauschinger effect increases with the increment of pre-compressed deformation,and reaches saturation for X100 pipeline steel when the pre-compression is 1.5%.As the strength of the pipeline steels increases,the Bauschinger effect becomes more obvious.Under the experimental conditions,X80 and X100 pipeline steels represent transient softening and permanent softening,respectively.In combination with the chemical composition and the microstructural characteristics of X80/X100 pipeline steels,it is revealed that for the pipeline steels,the strength difference between soft and hard phases (M/A islands for instance),the volume fraction of hard phases,and the dislocation density in original microstructure are the key factors of Bauschinger effect.更多还原