采用EBSD技术研究了挤压态GH3625合金冷变形过程中的组织演变、晶界特征分布、位错密度、应力分布及织构演变规律。结果表明，随着冷变形量的增加，晶粒变形程度加大，晶粒形貌由扁平状转变为细条状，晶体转动使得晶界与加载压力轴垂直分布；随着冷变形量的增加，大角度晶界逐渐向小角度晶界转变，孪晶界的比例逐渐增加。随着冷变形量的增加，局部取向差的平均值({\bar{\theta }}_{\mathrm{L}})升高，位错密度增加；同时，晶粒变形均匀性逐渐变好，应力集中分布逐渐向应力均匀分布转变。随着冷变形量的增加，其形变织构的类型基本保持不变，而具有稳定取向的Copper织构{112}<111>的强度略有降低；同时，由不均匀变形产生的Rotated-cube织构{001}<110>的强度降低；此外，形变孪晶的形成导致Goss织构{110}<001>和Brass-R织构{111}<112>的强度降低。

GH3625 alloy is a wrought nickel-based superalloy mainly used in aeronautical, aerospace, chemical, nuclear, petrochemical and marine applications industry due to its good combination of mechanical properties and corrosion resistance on prolonged high-temperature exposure to aggressive environments. However, the cold deformation microstructure directly determines the microstructure of the alloy pipe, thereby affecting the performance of the alloy pipe. In this work, the microstructure evolution, grain boundary characteristics distribution, dislocation density, stress distribution and texture evolution of the hot-extruded GH3625 superalloy during cold deformation were investigated by EBSD technique. The results show that the degree of grain deformation increases and the grain morphology changes from flat to thin strip, with the increase of cold deformation. The rotation of the crystal makes the grain boundary perpendicular to the loading pressure axis. With the increase of cold deformation, the high angle grain boundaries (HAGBs) gradually changes to the low angle grain boundaries (LAGBs), and the proportion of twin grain boundary increases gradually. The average of local misorientation ({\bar{\theta }}_{\mathrm{L}}) increases with the increase of cold deformation, which can reflect the increase of dislocation density. With the increase of cold deformation, the uniformity of grain deformation gradually becomes better, and the stress concentration distribution gradually changes to the stress uniform distribution. With the cold deformation increases, the type of deformation texture remains basically unchanged, while the strength of the Copper texture {112}<111> with stable orientation is slightly reduced. Meanwhile, the Rotated-cube texture {001}<110> generated by inhomogeneous plastic deformation is reduced in strength. In addition, the formation of deformation twin results in a decrease in the strength of the Goss texture {110}<001> and the Brass-R texture {111}<112>.