Details

Autor(en) / Beteiligte

• Li, Xiaolin
• Li, Haozhe
• Liu, Linxi
• Deng, Xiangtao
• Wang, Zhaodong

Titel

The formation mechanism of complex carbides in Nb-V microalloyed steel

Ist Teil von

• Materials letters, 2022-03, Vol.311, p.131544, Article 131544

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •HRTEM and APT were used to investigate the formation mechanisms.•Replacement and heterogeneous mechanism can appear simultaneously.•Two mechanisms both facilitate precipitation for the reducing interfacial energy. The formation mechanism of complex precipitates in Nb-V microalloyed steel has been systematically studied by high resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). The results reveal that there are two precipitation mechanism: replacement and heterogeneous mode. The core–shell precipitate has been observed with double direction Moiré fringe, which is formed by the heterogeneous mechanism, while for the precipitates with uniform distributed V and Nb atoms, is formed by the replacement mechanism. These two modes both reduce the lattice misfit and promote precipitation. In addition, the APT result reveals that the ratio of V to Nb increases with the increase of particle size, which matches well with the previous TEM results.