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Suppression of Coating Layer Crack by Diffusion Heat Treatment in Al-Si Coated HPF Steels

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Abstract

The effect of diffusion heat treatment (DHT) on the cracking of the coating layer in Al-Si coated hot press forming (HPF) steel was investigated. Cracking-induced micro-delamination in the coating layer has limited applications of the Al-Si coated HPF steels. Introduction of DHT process can modify the microstructure and constituent phase in the coating layer which can reduce the cracking. DHT was performed at 650 °C for 360 min to drive Fe diffusion into the coating layer. Formation of band-shaped τ1-Fe3Al2Si3 in the coating layer during the DHT was observed by EBSD and SEM. After HPF process of the diffusion heat treated coating specimen, the phase fraction of FeAl increased and that of η-Fe2Al5 decreased compared to the conventional Al-Si coating specimen, due to the increase of τ1-Fe3Al2Si3. Owing to the higher fracture toughness of FeAl compared to η-Fe2Al5, application of DHT improved the toughness of the coating layer and reduced the crack density in it. DHT did not significantly affect the mechanical properties of the base steel.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, South Korea

    Sang-Man Yun, Hojun Gwon & Sung-Joon Kim

  2. Technical Research Laboratories, POSCO, Incheon & Gwangyang, South Korea

    Sang-Man Yun & Jinkeun Oh

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  1. Sang-Man Yun
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  2. Hojun Gwon
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  3. Jinkeun Oh
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  4. Sung-Joon Kim
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Correspondence to Sung-Joon Kim.

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Yun, SM., Gwon, H., Oh, J. et al. Suppression of Coating Layer Crack by Diffusion Heat Treatment in Al-Si Coated HPF Steels. Met. Mater. Int. 28, 2668–2676 (2022). https://doi.org/10.1007/s12540-021-01161-w

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  • DOI: https://doi.org/10.1007/s12540-021-01161-w

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