高碳镀锌钢丝的组织演变及对扭转性能的影响

针对钢丝镀锌后扭转值波动很大的实际问题,本文系统表征分析了钢丝拉拔—热镀锌—扭转生产过程中的微观组织演化.研究结果表明：钢丝的微观组织在生产过程中会发生较大的变化.拉拔和扭转过程中索氏体片会发生扭曲变形使得片层间距减小,渗碳体片发生破碎,小尺寸的渗碳体颗粒发生溶解,钢丝中的位错密度会显著增加;而热镀锌过程使得小尺寸的渗碳体颗粒发生溶解,同时能消除钢丝内部的应力,使得位错密度降低.渗碳体片破碎、渗碳体颗粒溶解、索氏体片层间距、位错密度等因素综合作用,导致了钢丝扭转过程中的性能差异.

Microstructure Evolution of High Carbon Galvanized Steel Wire and Effect on Torsional Property

Focusing on the fluctuation problem of torsion property of steel wire after galvanizing in practice, microstructure evolution of the wire in the drawing, hot-galvanizing and torsion processes was systematically characterized and analyzed in this work. The results show that in the processes of drawing and torsion of the wire, the sorbite sheet is distorted, the lamellar spacing is reduced, the cementite sheet is broken, the small cementite particles are dissolved, and dislocation density greatly increases. The hot-galvanizing process can dissolve the small-sized cementite particles, eliminate the internal stress and reduce the dislocation density in the wire. The comprehensive effects of cementite sheet breakage, cementite particle dissolution, sorbite lamellar spacing and dislocation density lead to the performance difference in the process of steel wire torsion.