Preparation Method and Diffusion Mechanism of Fe-Al Coating on Q235 Low Carbon Steel by Pack Aluminizing

doi:10.11901/1005.3093.2020.449

Chinese Journal of Materials Research

2021, Vol. 35

Issue (8): 572-582 DOI: 10.11901/1005.3093.2020.449

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Preparation Method and Diffusion Mechanism of Fe-Al Coating on Q235 Low Carbon Steel by Pack Aluminizing

LI Ningning¹^,², CHEN Yang², CHEN Xi¹, YIN Liying¹, CHEN Guang²(

)

^1.School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
^2.MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China

Cite this article:

LI Ningning, CHEN Yang, CHEN Xi, YIN Liying, CHEN Guang. Preparation Method and Diffusion Mechanism of Fe-Al Coating on Q235 Low Carbon Steel by Pack Aluminizing. Chinese Journal of Materials Research, 2021, 35(8): 572-582.

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Abstract

The Fe-Al coating, with compactness, stiffness, and continuity, could be prepared on Q235 low carbon steel by pack aluminizing. The phase structure, morphology, composition, and hardness of the prepared coating were characterized by XRD, SEM, EDS, and micro-hardness tester respectively. Results indicate that the Fe-Al coating is composed of Fe₂Al₅ and FeAl₃ phases, whilst, the coating fabricated at 750℃ is particularly rich in Fe₂Al₅ phase. With the rising temperature, the thickness of Fe-Al coating increases, whereas the micro-hardness decreases. As a result of aluminizing for different time, the formed coatings are composed of the two phases Fe₂Al₅ and FeAl₃as well. However, with the increasing aluminizing time, the content of FeAl₃phase decreases, while the micro-hardness of the coating decreases slightly. Finally, a diffusion mechanism related with the formation of Fe-Al coating is proposed based on the comprehensive analysis on the thermodynamics and kinetics of pack aluminizing process.

Key words: metallic materials Fe-Al layer pack aluminizing diffusion coefficient micro-hardness

Received: 26 October 2020

ZTFLH:

TG131

Fund: National Natural Science Foundation of China(51571117);the High-level Introduction of Talent Research Start-up Fund of North China University of Water Resources and Electric Power(4001/40680)

About author: CHEN Guang, Tel: (025)84315159, E-mail: gchen@njust.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.449 OR https://www.cjmr.org/EN/Y2021/V35/I8/572

Table 1 Chemical composition of the Q235 low-carbon steel (mass fraction, %)

Table 2 Particle size and purity of the Chemical reagents

Table 3 Experimental plan of the pack cementation

Fig.1 XRD patterns of the Fe-Al layer fabricated at various temperatures

Fig.2 XRD patterns of the Fe-Al layer fabricated for different time at 650℃

Fig.3 Surface morphology of the Fe-Al layers fabricated at various temperature (a) 550℃, (b) 650℃, (c) 750℃, (d) 850℃

Table 4 Composition of the Fe-Al layers fabricated at various temperature (atomic fraction, %) (A-550℃, B-650℃, C-750℃, D-850℃)

Fig.4 Surface morphology of the Fe-Al layers fabricated at various time at 650℃ (a) 15 h, (b) 20 h, (c) 25 h

Table 5 Composition of the Fe-Al layers fabricated at various time (a-15 h, b-20 h, c-25 h)

Fig.5 Cross-section morphology (a) and composition (b) of the Fe-Al layer fabricated at 550℃

Fig.6 Cross-section morphology and composition of the Fe-Al layers fabricated at different temperature (a, b) 650℃, (c, d) 750℃, (e, f) 850℃

Table 6 Diffusion coefficient D of Al at different temperature

Fig.7 Cross-section morphologies and compositions of the Fe-Al layers fabricated at different time (650℃) (a, b) 15 h, (c, d) 20 h, (e, f) 25 h

Table 7 Diffusion coefficient D of Al at different aluminized time

Fig.8 Micro-hardness of the Q235 steel (a) and Fe-Al layer fabricated at different temperature (b) 650℃, (c) 750℃, (d) 850℃

Fig.9 Micro-hardness of the Fe-Al layer fabricated at different time (at 650℃) (a) 15 h, (b) 20 h, (c) 25 h

Fig.10 The correlation between the Fe-Al layer thicknesses and different aluminizing temperature

Fig.11 The correlation between the Fe-Al layers thickness and aluminizing time

Fig.12 Schematic diagram of Fe-Al layer growth by pack cementation (a) FeAl₃ phase began to form, (b) formation of Fe₂Al₅ phase, (c) growth of Fe₂Al₅ phase, (d) FeAl₃phase is eventually dispersed

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