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采用盐浴热处理方法配合性能检测及显微组织分析方法研究了热处理工艺对含钒冷轧TRIP钢组织性能的影响,结果表明试验钢在所采用的热处理工艺下其抗拉强度均达到700 MPa,且在780℃×60 s+400℃×180 s工艺下获得最佳综合性能,屈服强度、抗拉强度、断后伸长率、强塑积分别为514 MPa、738 MPa、29%、21 402 MPa·%;随着两相区退火温度的升高,两相区奥氏体所占的体积分数也越高,使最终组织中贝氏体及马氏体等强化相含量增多,造成试验钢强度上升、塑性下降;钒在试验钢中对残余奥氏体的积极作用并未体现,可能与退火时间较短和贝氏体区等温时钒碳(氮)化物重新析出消耗残余奥氏体中碳原子造成其含量及稳定性下降有关。
The effect of heat treatment process on the microstructure and properties of cold-rolled vanadium-containing TRIP steel was studied by salt bath heat treatment combined with the performance test and microstructure analysis. The results show that the tensile strength of the test steel reaches 700 MPa under the heat treatment process, The best comprehensive properties were obtained under the conditions of 780 ℃ × 60 s + 400 ℃ × 180 s. The yield strength, tensile strength, elongation at break and strong plastic product were 514 MPa, 738 MPa, 29% and 21 402 MPa, respectively ·%; With the increase of annealing temperature in the two-phase region, the volume fraction of austenite in the two-phase region is also higher, so that the content of strengthening phase such as bainite and martensite in the final structure increases, The plasticity of vanadium decreased in the test steel. The positive effect of vanadium on residual austenite in the test steel was not demonstrated. The vanadium carbon (nitrogen) compounds were re-precipitated and consumed when the annealing time was short and the bainite region was isothermal. Atoms caused by its content and stability of the decline.