The influence of torsion deformation on textures of cold drawing pearlitic steel wires was investigated by twisting the wires to different number of revolutions. Macro-texture(over the entire wire cross section) associated with torsion deformation was investigated by X-ray diffraction, while micro-texture(near the wire surface) was characterized by EBSD. The results show that the <110>macro-texture increases at the beginning of torsion and then decreases with increasing of torsion strain, while the <110> micro-texture decreases linearly with increasing of torsion strain. The relationships between the <110> fiber texture and the microhardness of the wires are also discussed.
The microstructures of pearlitic steel wire rods and steel wires are commonly characterized by secondary electron imaging (SEI)technique using scanning electron microscopy(SEM).In this work,a back-scattered electron imaging(BSEI)method is proposed to determine the microstructures of undeformed and deformed pearlitic steels with nanometer scale pearlite lamellae.The results indicate that BSEI technique can characterize the pearlite lamellas veritably and is effective in quantitative measurement of the mean size of pearlite interlamellar spacing.To some extent,BSEI method is more suitable than SEI technique for studying undeformed and not severely deformed pearlitic steels.
GUO Ning LIU Qing XIN YunChang LUAN BaiFeng ZHOU Zheng
