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<p>This study aims to investigate the influence of laser scanning speed on the microstructure, amorphous phase formation, microhardness, and corrosion behavior of iron-based amorphous alloy (Fe−5 wt.% C) claddings on A283 steel substrate, a material widely used in structural applications. Accordingly, elemental iron and graphite powders were milled in planetary ball mill at 400 rpm for 100 hours. Subsequently, the powder was pre-placed onto substrates and subjected to laser cladding using a pulsed Nd:YAG laser with a fixed power of 170 W and varying scanning speeds of 4, 6, and 8&#xa0;mm/s. Microstructural evolution, phase formation, hardness and corrosion behavior were then assessed through SEM, XRD, microhardness and electrochemical testing, respectively. The results indicated that from the top layer to the substrate, the cladding layer was consisted of an amorphous phase and crystalline martensitic structure with carbide grains in the matrix. The amorphous phase content increased with increasing scanning speed, reaching a maximum of 54.7% at 8 mm/s. Microhardness measurements showed a peak hardness of 1144 HV<sub>2.5</sub> at the same scanning speed. Electrochemical corrosion tests demonstrated a significant reduction in corrosion current density from 8.6 μA/cm<sup>2</sup> at 4 mm/s to 3.0 μA/cm<sup>2</sup> at 8 mm/s, indicating enhanced corrosion resistance.</p>

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Laser Cladding of A283 Steel Substrate Using Amorphous/Nano Crystalline Iron-Based Coating: A Study on Microstructure, Microhardness and Corrosion Properties

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Reza Zare Noorbakhsh,
  • Farhad Ostovan,
  • Ehsan Shafiei

摘要

This study aims to investigate the influence of laser scanning speed on the microstructure, amorphous phase formation, microhardness, and corrosion behavior of iron-based amorphous alloy (Fe−5 wt.% C) claddings on A283 steel substrate, a material widely used in structural applications. Accordingly, elemental iron and graphite powders were milled in planetary ball mill at 400 rpm for 100 hours. Subsequently, the powder was pre-placed onto substrates and subjected to laser cladding using a pulsed Nd:YAG laser with a fixed power of 170 W and varying scanning speeds of 4, 6, and 8 mm/s. Microstructural evolution, phase formation, hardness and corrosion behavior were then assessed through SEM, XRD, microhardness and electrochemical testing, respectively. The results indicated that from the top layer to the substrate, the cladding layer was consisted of an amorphous phase and crystalline martensitic structure with carbide grains in the matrix. The amorphous phase content increased with increasing scanning speed, reaching a maximum of 54.7% at 8 mm/s. Microhardness measurements showed a peak hardness of 1144 HV2.5 at the same scanning speed. Electrochemical corrosion tests demonstrated a significant reduction in corrosion current density from 8.6 μA/cm2 at 4 mm/s to 3.0 μA/cm2 at 8 mm/s, indicating enhanced corrosion resistance.