冷拉拔对高碳钢盘条组织和性能的影响
Jiangxi Metallurgy（2020）
Abstract
文中采用一种碳含量为0.6％的高碳钢盘条,利用连续拉拔机和水箱拉丝机分别将准5.5 mm盘条拉拔至准2.5 mm和准1.45 mm.研究了原始盘条和拉拔钢丝的显微组织和力学性能的变化,同时与K·Д·波捷姆金经验公式进行了对比分析.研究结果表明:盘条热轧态显微组织主要为索氏体和少量的先共析铁素体,铁素体沿原奥氏体晶界分布,渗碳体片层随机分布,芯部显微组织中铁素体含量明显较高.随着拉拔减面率的增加,先共析铁素体逐渐变细小,沿拉拔方向呈条状分布.渗碳体片层逐渐向拉拔方向转动,沿着拉拔方向被拉长,渗碳体片层间距明显减小,当拉拔减面率达到93.05％时,形成典型的纤维状组织.随着拉拔减面率的增加,盘条抗拉强度和硬度明显增加,断面收缩率和伸长率逐渐降低,这与拉拔过程中组织的变化有关.与K·Д·波捷姆金经验公式计算结果相比,盘条拉拔后抗拉强度增量略微偏低,这与原始盘条的组织中索氏体含量和均匀性有关,拉拔钢丝再次拉拔后抗拉强度增量与K·Д·波捷姆金经验公计算结果基本一致.
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