Li Aijun, Liu Jiaxin, Wang Yangxin, Hu Chundong
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Zhejiang Institute of Advanced Materials, Shanghai University, Jiaxing 314100, China.
Materials (Basel). 2025 Jun 23;18(13):2979. doi: 10.3390/ma18132979.
A novel ultrahigh-strength steel with Co and strengthened through nanoscale precipitation was developed. We found that the Co element had a synergistic effect on the precipitation process. The simulation results indicate that adding Co to steel can suppress the tracer diffusion coefficients of all the elements in the steel, hindering the atomic self-diffusion rate and long-range diffusion effect. A decrease in the atomic diffusion rate of precipitations will affect the nucleation, distribution, and growth of precipitations. The Atom probe tomography (APT) results indicate that the Co element not only dispersed uniformly in the matrix itself but also induced the uniform distribution of the precipitation phases. During the nucleation process of the precipitation, the rejected Co atoms formed small regions of high Co concentrations around the precipitation, inhibiting the coarsening of the precipitation. Under the synergistic effect of Co, the high number density of nanoscale NiAl and MC enhanced the strength of the steel.
开发了一种含钴并通过纳米级析出强化的新型超高强度钢。我们发现钴元素对析出过程具有协同作用。模拟结果表明，在钢中添加钴会抑制钢中所有元素的示踪扩散系数，阻碍原子自扩散速率和长程扩散效应。析出物原子扩散速率的降低会影响析出物的形核、分布和生长。原子探针断层扫描（APT）结果表明，钴元素不仅均匀地分散在基体本身中，还诱导了析出相的均匀分布。在析出物的形核过程中，被排斥的钴原子在析出物周围形成了高钴浓度的小区域，抑制了析出物的粗化。在钴的协同作用下，纳米级NiAl和MC的高数量密度提高了钢的强度。
Zotero 插件
