Wear behavior of laser cladded WC-reinforced Ni-based coatings under low temperature

Cavitation erosion/corrosion synergy and wear behaviors of nickel-based alloy coatings on 304 stainless steel prepared by cold metal transfer

Wear mechanisms and micro-evaluation of WC + TiC particle-reinforced Ni-based composite coatings fabricated by laser cladding

Laser cladding, a novel surface treatment technology, utilizes a high-energy laser beam to melt diverse alloy compositions and form a specialized alloy-cladding layer on the surface of the substrate to enhance its property. However, it can generate substantial residual stresses during the rapid cooling and heating stages, due to inadequate selection of cladding process parameters and disparities in thermophysical properties between the clad layer and substrate material, leading to the formation of various types of cracks. These cracks can significantly impact the quality and performance of the coating. This paper presents a comprehensive review of crack types and their causes in laser cladding coatings, and identifies that three primary sources of residual stresses, thermal stress, organizational stress, and restraint stress, are the fundamental causes of crack formation. The study proposes several strategies to control coating cracks, including optimizing the coating layer material, refining the coating process parameters, incorporating heat treatment, applying auxiliary fields, and utilizing numerical simulations to predict crack initiation and propagation. Additionally, the paper summarizes crack control methods for emerging structural materials and novel preparation processes. Lastly, the paper analyzes the prospects, technical approaches, and key research directions for effectively controlling cracks in laser cladding coatings.

/pdf/crack-formation-mechanisms-and-control-methods-of-laser-3acckfwb.pdf

Crack Formation Mechanisms and Control Methods of Laser Cladding Coatings: A Review

One of the primary failure modes of 45 steel is severe surface wear, which significantly raises its application cost. In order to improve the wear resistance, high-hardness Fe-based alloy coatings with varying boron contents were prepared on 45 steel substrates by preplaced-powder laser cladding in this study. The effect of boron content on the phase composition and microstructural evolution of the coatings were systematically studied. The proportion, morphology, and distribution characteristics of boride phases in the coatings were discussed in detail. The results demonstrated that the Fe-based alloy coatings with different boron contents were composed of α-Fe, Cr7C3, and Fe2B phases. The boron content had a significant influence on the morphology and proportion of the boride phases. With the increase of boron content, the proportion of boride phases gradually increased and the morphology transition was reticular → cluster-shape → long strip-shape → plate-shape. The composition analysis revealed that the boride was Cr-rich Fe2B phase and the content of Cr in the borides increased with the boron content of the coating. The addition of boron could effectively improve the hardness and wear resistance of the Fe-based coatings, which could be attributed to the boride hard phases in the microstructures. The coating with 6.0 wt% B exhibited the highest microhardness and least amount of wear loss. The wear mechanism of the coating with different boron contents was also discussed. 

Effect of boron on the microstructural evolution and wear resistance of high-hardness Fe-based alloy coatings prepared by laser cladding

Microstructure and properties of Ni-WC gradient composite coating prepared by laser cladding

Growth, microstructure and magnetic properties of bixbyite structure ScFeO3: A comparative study between bulk and thin film

Preparation and characterization of a novel nanostructured Yb2Si2O7 feedstock used for plasma-sprayed environmental barrier coatings

High pressure and high temperature treatment of chemical vapor deposited polycrystalline diamond: from opaque to transparent

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Papers

Microstructure and properties of Ni-WC gradient composite coating prepared by laser cladding

Growth, microstructure and magnetic properties of bixbyite structure ScFeO3: A comparative study between bulk and thin film

Preparation and characterization of a novel nanostructured Yb2Si2O7 feedstock used for plasma-sprayed environmental barrier coatings

High pressure and high temperature treatment of chemical vapor deposited polycrystalline diamond: from opaque to transparent