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Fe-Based Amorphous Coatings on AISI 4130 Structural Steel for Corrosion Resistance

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Abstract

The current study focuses on synthesizing a novel functional coating for corrosion resistance applications, via laser surface alloying. The iron-based (Fe48Cr15Mo14Y2C15B) amorphous precursor powder is used for laser surface alloying on AISI 4130 steel substrate, with a continuous wave ytterbium Nd-YAG fiber laser. The corrosion resistance of the coatings is evaluated for different processing conditions. The microstructural evolution and the response of the microstructure to the corrosive environment is studied using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Microstructural studies indicate the presence of face-centered cubic Fe-based dendrites intermixed within an amorphous matrix along with fine crystalline precipitates. The corrosion resistance of the coatings decrease with an increase in laser energy density, which is attributed to the precipitation and growth of chromium carbide. The enhanced corrosion resistance of the coatings processed with low energy density is attributed to the self-healing mechanism of this amorphous system.

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Acknowledgements

The authors acknowledge the partial financial support from National Science Foundation project (NSF-CMMI 0969249) and CART-UNT for providing microscopy facilities.

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Authors and Affiliations

  1. Laboratory of Laser Materials Processing and Synthesis, Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    Shravana Katakam, S. Santhanakrishnan & Narendra B. Dahotre

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  1. Shravana Katakam
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  2. S. Santhanakrishnan
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  3. Narendra B. Dahotre
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Correspondence to Narendra B. Dahotre.

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Katakam, S., Santhanakrishnan, S. & Dahotre, N.B. Fe-Based Amorphous Coatings on AISI 4130 Structural Steel for Corrosion Resistance. JOM 64, 709–715 (2012). https://doi.org/10.1007/s11837-012-0338-9

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