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Microstructural Evolution and Tribological Performance of Fe-Based Amorphous Coatings via Wide-Beam Laser Cladding: Role of Powder Feed Rate
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DOI：10.1007/s11666-026-02304-4.png)
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Abstract
En 中文
Fe-based amorphous coatings are widely used in petrochemical, mining, and power generation industries due to their excellent wear and corrosion resistance derived from the unique amorphous structure. Therefore, wide-beam laser cladding was employed to investigate the role of powder feed rate on microstructure and wear performance. The coatings exhibited amorphous–crystalline composite structure, with the amorphous phase content increasing then decreasing as the feed rate increased, peaking at about 72% at 0.8 rpm (3.2 g/min). This condition produced a gradient microstructure with a uniform interfacial layer and finely dispersed hard particles, achieving a peak hardness of 928.7 HV0.2 and a specific wear rate of 6.26 × 10−7 mm3/N·m by forming a protective oxide tribolayer. Lower or higher feed rates instead led to coarse crystalline growth or defects, triggering severe abrasive or brittle wear. The wear resistance arises from a synergistic strengthening–toughening mechanism: The hard amorphous matrix and dispersed crystalline phases support a stable protective tribolayer during sliding. This work investigated the role of powder feed rate on the microstructure and tribological performance of Fe-based amorphous coatings deposited via wide-beam laser cladding. A critical threshold (0.8 rpm, 3.2 g/min) was identified, where the amorphous phase content reached 72%, with a gradient layer and uniformly dispersed hard particles. This condition yielded a peak hardness of 928.7 HV0.2 and the lowest wear volume of 270437.3 μm3 and specific wear rate of 6.26 × 10−7 mm3/N·m via synergistic strengthening-toughening and a protective oxide tribolayer. Our findings established processing-microstructure-property relationships, advancing laser cladding of Fe-based amorphous coatings for agricultural machinery applications.
Keywords:
Fe-based amorphous coating
microstructural evolution
powder feed rate
wear resistance
wide-beam laser cladding
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