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基于冷轧双相钢的生产工艺,采用ULAVC-CCT-AY-II连续退火模拟器对其进行退火,通过拉伸试验测试退火后的力学性能,并利用OLYMPUS-BX51金相显微镜和扫描电镜对热处理后的显微组织进行观察。结果显示:在760～780℃之间进行保温,缓冷温度设定为670℃,可获得铁素体加马氏体组织;添加Cr可以提高奥氏体的淬透性;预先再结晶处理改变了双相钢淬火后马氏体的形态和分布,得到较为均匀的F+M双相组织。
Based on the production process of cold-rolled dual-phase steel, the ULAVC-CCT-AY-II continuous annealing simulator was used to anneal the cold-rolled dual-phase steel. The mechanical properties after annealing were tested by tensile test. By using OLYMPUS-BX51 metallographic microscope and scanning electron microscope The microstructure after the heat treatment was observed. The results show that the microstructure of ferrite and martensite can be obtained when the temperature is kept between 760 and 780 ℃ and the slow cooling temperature is set to 670 ℃. The addition of Cr can improve the hardenability of austenite. The pre-recrystallization treatment changes After quenching dual-phase steel martensite morphology and distribution, get more uniform F + M duplex structure.