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。
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.
出处
《热加工工艺》
CSCD
北大核心
2011年第18期160-163,166,共5页
Hot Working Technology
关键词
双相钢
临界区淬火
马氏体
组织与性能
dual-phase steel
critical region quenching
martensite
microstructure and mechanical property
