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采用TMCP(Thermo-Mechanical Controlled Process)实验,研究了不同冷却方式对汽车车轮用低碳FB钢的组织及扩孔性能的影响,以及FB钢扩孔时的断裂类型及断裂机理。结果表明,采用连续冷却的实验钢,得到了针状铁素体+贝氏体组织,针状铁素体明显降低了两相硬度比,改善了扩孔性能。FB钢在扩孔过程中的断裂机理为微孔聚集的韧性断裂。实验结果可为进一步研究低碳FB钢在车轮上的应用提供实验依据。
The TMCP (Thermo-Mechanical Controlled Process) experiment was used to study the effect of different cooling methods on the microstructure and hole-expanding performance of low-carbon FB steel for automobile wheels and the fracture type and fracture mechanism of reaming steel. The results show that the acicular ferrite + bainite microstructure is obtained by continuous cooling of experimental steels. The acicular ferrite obviously reduces the hardness ratio of two phases and improves the hole expanding performance. The fracture mechanism of FB steel in reaming process is the ductile fracture with micropore aggregation. The experimental results can provide experimental evidence for further research on the application of low-carbon FB steel on wheels.