Prashant Huilgol, K. Rajendra Udupa, and K. Udaya Bhat, Formation of microstructural features in hot-dip aluminized AISI 321 stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp.190-198. https://dx.doi.org/10.1007/s12613-018-1562-2
Cite this article as: Prashant Huilgol, K. Rajendra Udupa, and K. Udaya Bhat, Formation of microstructural features in hot-dip aluminized AISI 321 stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 2, pp.190-198. https://dx.doi.org/10.1007/s12613-018-1562-2
Research Article

Formation of microstructural features in hot-dip aluminized AISI 321 stainless steel

Author Affilications
  • Hot-dip aluminizing (HDA) is a proven surface coating technique for improving the oxidation and corrosion resistance of ferrous substrates. Although extensive studies on the HDA of plain carbon steels have been reported, studies on the HDA of stainless steels are limited. Because of the technological importance of stainless steels in high-temperature applications, studies of their microstructural development during HDA are needed. In the present investigation, the HDA of AISI 321 stainless steel was carried out in a pure Al bath. The microstructural features of the coating were studied using scanning electron microscopy and transmission electron microscopy. These studies revealed that the coating consists of two regions:an Al top coat and an aluminide layer at the interface between the steel and Al. The Al top coat was found to consist of intermetallic phases such as Al7Cr and Al3Fe dispersed in an Al matrix. Twinning was observed in both the Al7Cr and the Al3Fe phases. Furthermore, the aluminide layer comprised a mixture of nanocrystalline Fe2Al5, Al7Cr, and Al. Details of the microstructural features are presented, and their formation mechanisms are discussed.
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    3. Zhaobin Liu, Jiaxin Li, Haoping Peng, et al. Effect of Mg Addition on Microstructure and Sacrificial Anode Protection Performance of Hot Dip Al-5Zn-4Si-xMg Coating. Coatings, 2023, 13(6): 1087. DOI:10.3390/coatings13061087
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    6. T.N. Prasanthi, C. Sudha, P. Shashank Reddy. Hot dip aluminization of 304L SS and P91 ferritic-martensitic steel – Comparison of interface morphology and growth kinetics of reaction zones. Surface and Coatings Technology, 2022, 440: 128465. DOI:10.1016/j.surfcoat.2022.128465
    7. Xing-run Chen, Guo-guang Cheng, Yu-yang Hou, et al. Influence of refining process and utilization of different slags on inclusions, titanium yield and total oxygen content of Ti-stabilized 321 stainless steel. Journal of Iron and Steel Research International, 2020, 27(8): 913. DOI:10.1007/s42243-020-00444-7
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    9. Prashant Huilgol, K. Rajendra Udupa, K. Udaya Bhat. Microstructural investigations on the hot-dip aluminized AISI 321 stainless steel after diffusion treatment. Surface and Coatings Technology, 2019, 375: 544. DOI:10.1016/j.surfcoat.2019.07.031
    10. Prashant Huilgol, K. Rajendra Udupa, K. Udaya Bhat. Metastable microstructures at the interface between AISI 321 steel and molten aluminum during hot-dip aluminizing. Surface and Coatings Technology, 2018, 348: 22. DOI:10.1016/j.surfcoat.2018.05.013

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