Revealing the two-step nucleation and growth mechanism of vanadium carbonitrides in microalloyed steels

被引：35
|
作者：
Wang, Hongcai [1 ]
Li, Yujiao [2 ]
Detemple, Eric [3 ]
Eggeler, Gunther [1 ]
机构：
[1] Ruhr Univ Bochum, Inst Mat, Univ St 150, D-44801 Bochum, Germany
[2] Ruhr Univ Bochum, ZGH, D-44801 Bochum, Germany
[3] AG Dillinger Huttenwerke, Dept Heavy Plate Res, D-66763 Dillingen, Germany
来源：
SCRIPTA MATERIALIA | 2020年 / 187卷
关键词：
Vanadium carbonitrides (VCN); Nucleation; Twinning; Microalloyed steels; NANOMETER-SIZED CARBIDES; ATOM-PROBE; INTERPHASE PRECIPITATION; TRANSFORMATION; NB; MICROSTRUCTURE; AUSTENITE; EVOLUTION; CLUSTERS; PHASE;
D O I：
10.1016/j.scriptamat.2020.06.041
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Combining high-resolution transmission electron microscopy (HR-TEM) and 3-dimensional atom probe tomography (3D-APT), the early stages of nucleation and growth of vanadium carbonitrides (VCN) were revealed. VCN nucleation starts with locally distorted body-centered cubic (bcc) lattices due to a substitution of Fe atoms by V atoms, which results in the formation of an intermediate coherent crystal structure within the ferrite matrix. Misfit strain self-accommodation leads to twining within the VCN particles. As the particles grow, the precipitates gradually lose coherency and grow into discs or plates. Simultaneously, the intermediate crystal structure of the nucleus transforms into the equilibrium VCN-structure. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：350 / 354
页数：5
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