低碳Si-Nb双相钢组织与性能的研究
Study on Microstructure and Mechanical Properties of Low Carbon Si-Nb Dual-phase Steel
隋晓红, 赵宝纯, 李 平, 李昊涵
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作者单位：鞍钢股份技术中心, 辽宁 鞍山 114009
中文关键字：双相钢；临界区淬火； 马氏体； 组织与性能
英文关键字：dual-phase steel; critical region quenching; martensite; microstructure and mechanical property
中文摘要：研究了不同热处理状态下低碳硅-铌双相钢的显微组织形态及其对力学性能的影响。结果表明：采用双重淬火和临界区淬火，可在830～960 ℃获得铁素体 + 纤维状或岛状马氏体双相组织；马氏体中的亚结构为位错型和孪晶型共存。纤维状双相组织由于两相界面较宽，具有更为理想的强塑性配合，可直接冷拔成钢丝。临界区淬火的双相钢冷拔成钢丝后，经300 ℃充分回火,在保持一定强度的同时，塑性得以进一步改善。
英文摘要：The effects of heat treatment on microstructure and mechanical properties of low carbon Si-Nb dual-phase steel were studied. The results show that ferrite and martensite are obtained through critical region quenching and double quenching at 830 ℃～960 ℃. The martensite is in the state of island and fibre, and its substructure is dislocations and twin crystal. Because of the broader interface between two-phase, the fibrous dual-phase structure has an ideal match of strength and ductility. The dual-phase steel quenched at critical region is drawn to wires. After the wire tempered at 300 ℃, its strength is maintained and at the same time its ductility is improved.