Next Article in Journal
Mesomechanical Modeling and Numerical Simulation of the Diffraction Elastic Constants for Ti6Al4V Polycrystalline Alloy
Previous Article in Journal
Corrosion Inhibition
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Metals 2018, 8(10), 820;

Formation Procedure of Reaction Phases in Al Hot Dipping Process of Steel

Pos Ceramics, Pusan 48059, Korea
Department of Materials Science and Engineering, Pusan National University (PNU), Pusan 46241, Korea
Author to whom correspondence should be addressed.
Received: 25 September 2018 / Revised: 8 October 2018 / Accepted: 8 October 2018 / Published: 12 October 2018
PDF [14385 KB, uploaded 15 October 2018]


This study investigated the nucleation and growth mechanism of reaction layers and phases of hot-dipped boron steel in pure Al at 690 °C for 0–120 s. In the case of a dipping time of 30 s, reaction nuclei of width 10–15 μm and height 10 μm were formed on the steel surface in the flow direction of the liquid Al. This reaction layer was formed as a mixture of θ (Fe4Al13) phase of several nm to 2 μm, θ and η (Fe2Al5) of several nm, a columnar η region, and a β (FeAl) region of 500 nm thickness at the steel interface. At the grain boundaries of ferrite, in contact with the η phase, κ (Fe3AlC) was formed. Using the calculated Fe-Al phase diagram, it was determined that when Fe was dissolved in liquid Al from the steel above 2.5 at% (0.6 wt%), the θ phase was formed. Although most of the θ phases continuously grew toward the liquid phase, the θ phase in contact with the steel was transformed into the η phase with minimal differences in composition due to the inter-diffusion of Al and Fe. It was therefore concluded that the η phase formed at the interface became a growth nucleus and grew in a columnar form toward the steel. View Full-Text
Keywords: hot-dipping; inter-metallics formation; diffusion; phase transformation hot-dipping; inter-metallics formation; diffusion; phase transformation

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Shin, D.; Lee, J.-Y.; Heo, H.; Kang, C.-Y. Formation Procedure of Reaction Phases in Al Hot Dipping Process of Steel. Metals 2018, 8, 820.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top