Effect of laser remelting on the microstructure and corrosion property of the arc-sprayed AlFeNbNi coatings

Zhang, Yongang; Gao, Xiangfei; Liang, Xiubing; Chong, Kai; Wu, Dongting; Zou, Yong

doi:10.1016/j.surfcoat.2020.126099

Cited by 19 publications

(3 citation statements)

References 20 publications

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“…Such a significant increase in hardness is the effect of the work hardening process resulting from the particles hitting the formed coating and their plastic deformation during the cold spray process. Similar effect have also been reported by other authors [33][34][35]. Laser surface melting significantly affected the elimination of porosity, thus obtaining a uniform and compact microstructure.…”

Section: Resultssupporting

confidence: 89%

Archives of Metallurgy and Materials

Soboń

2021

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EffEct of LasEr surfacE MELting on MicrostructurE of coLd sprayEd ni20cr coatingsIn this study, Ni20Cr coatings were obtained by cold spraying on an aluminum alloy 7075 substrate. The obtained coatings were characterized by a uniform microstructure and low porosity. The sprayed coating has the same phase composition as the powder used. Next, the cold sprayed coatings were heat treated using a TRUMPF TLF 6000 TURBO (4 kW) CO 2 laser. The laser surface melting of the coatings resulted in the formation of a columnar structure and an improvement in their mechanical properties. The Ni20Cr cold sprayed coatings after additional laser melting showed lower porosity and an increase in microhardness and Young`s modulus.

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Section: Resultssupporting

confidence: 89%

Archives of Metallurgy and Materials

Soboń

2021

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“…As shown in Figure 11 , after polishing, the microstructure changed from a coarse columnar grain structure to fine equiaxed grain structure. The thermal undercooling caused by high cooling rates during laser polishing promoted the grain-refined effect [ 31 ]. Due to the Hall-Patch relationship, the finer grains caused by overlapping remelting can lead to the mechanical change.…”

Section: Methodsmentioning

confidence: 99%

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Zhou

Han

et al. 2021

Materials

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Laser polishing is a widely used technology to improve the surface quality of the products. However, the investigation on the physical mechanism is still lacking. In this paper, the established numerical transient model reveals the rough surface evolution mechanism during laser polishing. Mass transfer driven by Marangoni force, surface tension and gravity appears in the laser-induced molten pool so that the polished surface topography tends to be smoother. The AlSi10Mg samples fabricated by laser-based powder bed fusion were polished at different laser hatching spaces, passes and directions to gain insight into the variation of the surface morphologies, roughness and microhardness in this paper. The experimental results show that after laser polishing, the surface roughness of Ra and Sa of the upper surface can be reduced from 12.5 μm to 3.7 μm and from to 29.3 μm to 8.4 μm, respectively, due to sufficient wetting in the molten pool. The microhardness of the upper surface can be elevated from 112.3 HV to 176.9 HV under the combined influence of the grain refinement, elements distribution change and surface defects elimination. Better surface quality can be gained by decreasing the hatching space, increasing polishing pass or choosing apposite laser direction.

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“…Cui et al [345] examined the influence of laser re-melting, and it was noticed that re-melting of the coating resulted in higher density, improved adhesive strength, higher hardness and improved corrosion properties than that of as-sprayed coating. In case of coatings based on other MG systems like Al, Zhang et al [346] found that laser re-melting led to metallurgical bonding along the coating/substrate interface and complete densification of arc-sprayed Al–Fe–Nb–Ni MG composite coating, and the corrosion resistance the re-melted coatings was remarkably enhanced due to elimination of weak splat bonding and pores. For Fe-based MGCs, Jiang et al [347,348] reported that laser re-melted coating contains an increased amount of nanocrystalline precipitates compared to as-sprayed coating, ascribed to a lower cooling rate in re-melting than that of the plasma spraying process.…”

Section: Strategies To Improve the Corrosion Properties Of Thermal Sp...mentioning

confidence: 99%

Fe-based metallic glass coatings by thermal spraying: a focused review on corrosion properties and related degradation mechanisms

Nayak

Kumar

Laha

2022

International Materials Reviews

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Among various materials available for alleviating the corrosion-related degradation, thermal sprayed Fe-based metallic glass coatings (MGCs) have received huge attention from the scientific community due to the exceptional combination of mechanical and corrosion properties, along with commercially attractive low material cost of this particular alloy system. Emerging reports on the thermal sprayed Fe-based MGCs outperforming conventional corrosion-resistant materials and coatings have accelerated further exploration of this domain, resulting in an immense increase of research activities over the last few decades producing fascinating results. This review takes a holistic approach encompassing an in-depth assessment of all the relevant salient work till date, including corrosion properties, corresponding degradation mechanisms, metallurgical and environmental factors with reference to passive film dynamics and/or formation of corrosion products. Moreover, various strategies for improved corrosion properties and recent research progress have been reviewed with an attempt to identify the present knowledge gaps and the future research directions.

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Effect of laser remelting on the microstructure and corrosion property of the arc-sprayed AlFeNbNi coatings

Cited by 19 publications

References 20 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Fe-based metallic glass coatings by thermal spraying: a focused review on corrosion properties and related degradation mechanisms

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