论文标题
B和NB之间的协同作用可改善微合同钢的防火性
Synergism between B and Nb improves fire resistance in microalloyed steels
论文作者
论文摘要
新的防火钢的发展代表了材料科学和最重要的工程学的挑战。由于形成沉淀物和更坚硬的微分基构成，诸如NB和MO之类的合金元素（例如NB和MO）通常用于提高室内和高温的强度。在这项研究中，我们表明，在NB-微型合成的钢中添加少量硼可能在保持高温下的机械性能方面起着至关重要的作用。对于硼钢的66 \，\％的产量增长标准，以$ \ \ 574 $ \，°C的价格达到了约574 $ \，而没有硼，该值达到$ \ \ 460 $ \，°C，这是一种显着的硼硼诱导的机械强化增强。 DFT计算表明，与纯铁氧体相比，硼添加可以降低空位的形成能，而对于NB-B钢，还可以降低24 \，\％的降低，这表明硼niobium组合可作为有效的基于固定的强化剂。
The development of new fire-resistant steels represents a challenge in materials science and engineering of utmost importance. Alloying elements such as Nb and Mo are generally used to improve the strength at both room- and high-temperatures due to, for example, the formation of precipitates and harder microconstituents. In this study we show alternatively that the addition of small amounts of boron in Nb-microalloyed steels may play a crucial role in maintaining the mechanical properties at high temperatures. The 66\,\% yield-strength criteria for fire resistance is achieved at $\approx 574$\,°C for a boron steel, whereas without boron this value reaches $\approx 460$\,°C, a remarkable boron-induced mechanical strengthening enhancement. DFT calculations show that boron additions can lower the vacancy formation energy when compared to pure ferrite and, for Nb-B steels, there is a further 24\,\% reduction, suggesting that the boron-niobium combination acts as an effective pinning-based strengthening agent.
