Abstract The effect of Mo on the clustering and interphase precipitation occurring during phase transformation has been investigated in a strip-cast low-carbon steel containing Nb. In this work, isothermal coiling treatments were performed at 700 °C for various times to form interphase precipitates. Transmission electron microscopy (TEM), small-angle neutron scattering (SANS) and atom probe tomography (APT) results show that the addition of Mo increases the number density and volume fraction of clusters and interphase precipitates but has a negligible effect on their size, and overall provides for greater strengthening in the Mo-containing alloy. APT analysis shows that the interphase precipitates are composed of Nb, C and N in both alloys. The segregation of Mo is also observed in the interphase precipitates in the Mo-containing alloy, which is believed to relieve the lattice misfit between the precipitate and the matrix. It is proposed that the reduced lattice misfit allows for precipitate nucleation to occur more easily in the Mo-containing alloy.

中文翻译：

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钼对带钢连铸低碳铌钢700℃相间析出的影响

摘要 在含Nb 的带状铸造低碳钢中研究了Mo 对相变过程中发生的团簇和相间析出的影响。在这项工作中，等温卷取处理在 700 °C 下进行不同时间以形成相间沉淀物。透射电子显微镜 (TEM)、小角中子散射 (SANS) 和原子探针断层扫描 (APT) 结果表明，添加 Mo 增加了团簇和相间析出物的数量密度和体积分数，但对其尺寸的影响可以忽略不计，并且总体上在含Mo合金中提供更大的强化。APT 分析表明，两种合金中的相间析出物均由 Nb、C 和 N 组成。在含钼合金的相间析出物中也观察到了钼的偏析，这被认为可以缓解沉淀物和基体之间的晶格失配。建议减少的晶格失配允许在含 Mo 合金中更容易发生沉淀成核。