论文部分内容阅读
采用透射电子显微镜(TEM),对细晶高强IF钢在不同退火温度条件下无沉淀析出区(PFZ)的形成机制及其对材料力学性能的影响规律进行研究。结果表明,由于析出相粒子的固溶和粗大化与晶界迁移造成的扫动效应,导致仅在晶界一侧形成独特的无沉淀析出区,退火过程中无沉淀析出区优先在晶界经过的区域形成。在退火过程中,随着退火温度的升高,细晶高强IF钢无沉淀析出区的平均宽度增大,其屈服强度降低,n值逐渐增加。
Transmission electron microscopy (TEM) was used to study the formation mechanism of PFZ and the influence on the mechanical properties of fine-grained IF steel under different annealing temperatures. The results show that due to the swirling effect caused by the solid solution and coarsening of the precipitated particles and the grain boundary migration, a unique precipitate-free zone is formed only on one side of the grain boundary, and no precipitate precipitation zone preferentially passes through the grain boundary during the annealing Of the area formed. During the annealing process, with the increase of the annealing temperature, the average width of the precipitation-free zone of fine-grained high-strength IF steel increases, and its yield strength decreases and the value of n gradually increases.