采用光学显微镜和扫描电镜观察了SWRH77B高碳盘条中带状组织的形貌,并观察了带状组织在拉丝冷变形过程中的行为.结果表明:高碳盘条中的带状组织为马氏体.粗大的带状组织将直接导致拉丝断裂;稍小一点的带状组织不会引起拉丝断裂,但在钢丝内部存在着明显的非稳态扩展裂纹,是不安全的;细小的带状组织不会引起拉丝断裂,最终将以断续的点状形态存在于成品钢丝中,但对其安全性存在重大隐患.
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