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采用电子通道衬度(ECC)和电子背散射衍射(EBSD)技术研究了珠光体钢丝冷拉拔过程中微观组织的变化、铁素体微区取向与织构演变,结果表明,珠光体变形组织中存在剪切带(S带),它们的出现与渗碳体片条和拉拔方向之间的夹角有关:夹角越大,S带越多,随着拉拔应变量的增大,纵截面上珠光体片条逐渐转向拉拔方向,S带方向与拉拔方向的夹角逐渐减小,珠光体内的S带会引起铁素体晶粒局部微区取向急剧变化,从而使原有的珠光体团分裂成若干个由铁素体大角度晶界相隔的区域,钢丝拉拔过程中形成平行于拉拔方向的铁素体〈110〉丝织构,随着应变量的增大,平行于拉拔方向的铁素体〈110〉丝织构增强,其它丝织构组分减弱;靠近钢丝中心区域内的〈110〉丝织构增强幅度大于其它区域。
The changes of microstructure, ferrite micro-orientation and texture evolution during cold drawing of pearlite steel were studied by electronic channel contrast (ECC) and electron backscatter diffraction (EBSD). The results show that the deformation of pearlite There are shear bands (S band), their appearance and the cementite strip and the angle between the drawing direction: the larger the angle, S with the more, with the drawing strain increases, The longitudinal section of the pearlite sheet gradually turned to the drawing direction, the angle between the direction of the S band and the drawing direction gradually decreased, and the S band in the pearlite caused a drastic change in the orientation of the local micro-regions of the ferrite grains, Of the pearlite group is divided into a number of areas separated by large-angle ferrite grain boundaries, the wire drawing process to form a parallel to the drawing direction of the ferrite <110> silk texture, with the increase of the amount of strain, The texture of ferrite <110> parallel to the drawing direction is enhanced, while the other filaments are weakened. The <110> texture near the center of the filaments is strengthened more than other regions.