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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。
The microstructure of low-carbon silicon-niobium dual phase steel under different heat treatment conditions and its effect on mechanical properties were studied. The results show that the dual-phase ferrite + fibrous or island martensite can be obtained at 830-960 ℃ by dual quenching and critical quenching. The substructures in martensite are dislocation-type and twin-type . Fibrous duplex structure due to the wide interface between the two phases, with a more ideal strong plastic, cold drawn directly into the wire. After quenching the critical region of dual-phase steel cold-drawn into wire, the fully tempered at 300 ℃, while maintaining a certain degree of strength, plasticity can be further improved.