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采用CCT-AY-Ⅱ型钢板连续退火机模拟分析了V元素添加对TRIP800钢组织性能的影响规律。采用SEM和TEM等微观分析方法观察含钒与不含钒TRIP的微观组织,利用XRD法测量了残留奥氏体量,实验室测量了其力学性能。结果表明,随着退火温度的升高,试验钢铁素体相比例降低,贝氏体相比例升高,且含钒TRIP钢中有V(C,N)析出。820℃保温时,试验钢均获得最佳的综合力学性能。V元素的添加增加了试验TRIP钢的抗拉强度,而降低了屈服强度,有效降低了TRIP钢屈强比。且含V TRIP钢瞬时加工硬化指数前期大于无V TRIP钢,后期则小于无V TRIP钢。
CCT-AY-Ⅱ steel continuous annealing machine was used to simulate the influence of V addition on the microstructure and properties of TRIP800 steel. The microstructure of vanadium-containing and non-vanadium-containing TRIP was observed by microscopic analysis methods such as SEM and TEM. The amount of retained austenite was measured by XRD and its mechanical properties were measured in the laboratory. The results show that with the increase of annealing temperature, the ratio of ferrite phase decreases and the proportion of bainite increases, and V (C, N) precipitates in vanadium-containing TRIP steels. 820 ℃ insulation, the test steel are the best overall mechanical properties. The addition of V element increases the tensile strength of the TRIP steel and reduces the yield strength, which effectively reduces the yield strength of the TRIP steel. The transient hardening index of V TRIP steel was higher than that of the non-V TRIP steel in the early stage and less than that of the non-V TRIP steel in the late stage.