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- Title
Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al-Ni Alloy.
- Authors
Jae-Hyeong Lee; Jung-Gil Yun; Sung-Yun Kwak; Chung-Yun Kang
- Abstract
The formation mechanism of intermetallic compounds formed in boron steel hot-dipped in Al-7Ni (wt %) at 690 °C for 10-120 s was studied by identifying the intermetallic phases and investigating the growth process. Initially, a Fe3O4 oxide layer formed on the steel. The oxide layer separated into multiple layers sporadically; following this, the Al-Ni molten alloy permeated into the region of the oxide layer breakdown and formed the Al9FeNi (T, monoclinic, space group: P21/c) phase on the steel surfaces. The Al9FeNi (T) phase formed from the reaction between the Al-Ni molten alloy and Fe eluted from the steel; this phase not only acts as an Al interdiffusion channel, but also as a barrier for Fe; and facilitates only grain growth without a significant change in thickness. Inside the steel, the Fe2Al5 (η, orthorhombic, space group: Cmcm) phase grows along the c-axis in the [001] direction; and has a long columnar structure. The Fe3AlC (κ, Cubic, space group: Pm3m) phase is formed owing to a reduction in the Al concentration and the simultaneous diffusion and discharge of C toward the steel interface, as C cannot dissolve in the Fe2Al5 (η) phase.
- Subjects
NUCLEATION; INTERMETALLIC compounds; BORON steel
- Publication
Coatings (2079-6412), 2017, Vol 7, Issue 11, p195
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings7110195