Investigation on the microstructure and cracking susceptibility of laser-clad V2O5 /NiCrBSiC alloy coatings

Wang, Dongsheng; Liang, Erjun; Chao, Mingju; Yuan, Bin

doi:10.1016/j.surfcoat.2007.06.036

Cited by 82 publications

(49 citation statements)

References 11 publications

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“…Single layer samples with a thickness of 0.9-1.1 mm each consisted of 5 tracks with one 33% overlapping were deposited at scanning speed of 5 mm/s with a laser power of 900 W. Dilution from the substrate calculated by dividing the surface area of the deposited layer to the total area of the deposited layer plus remelted substrate was around 10 percent. The Ni-Cr-BSi coatings are very susceptible to cracking as a result of their low toughness and a big difference in the Coefficient of Thermal Expansion (CTE) between the [16][17][18]. Reducing the cooling rate of the deposits is a widely used method to reduce the cracking tendency of these materials [16,18].…”

Section: Methodsmentioning

confidence: 99%

“…The Ni-Cr-BSi coatings are very susceptible to cracking as a result of their low toughness and a big difference in the Coefficient of Thermal Expansion (CTE) between the [16][17][18]. Reducing the cooling rate of the deposits is a widely used method to reduce the cracking tendency of these materials [16,18]. In the present work, the substrate was preheated to 500 o C immediately before cladding using a tube furnace and the coated bars were left in the furnace to cool slowly down to the room temperature after their cladding.…”

Section: Methodsmentioning

confidence: 99%

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Evolution of microstructure and properties in laser cladding of a Ni-Cr-B-Si hardfacing alloy

Hemmati

Ocelík

Hosson

2011

Surface Effects and Contact Mechanics X

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Ni-Cr-B-Si coatings are used in many industrial applications in order to improve wear and/or corrosion properties. These coatings have traditionally been deposited by thermal spray techniques but the laser cladding process is also being increasingly employed to produce Ni-Cr-B-Si coatings with superior functional properties. In this research, the microstructural evolutions and the phase formations in the laser cladding of a Ni-Cr-B-Si alloy and their effects on the hardness of the clad layer are discussed. Results of this study show various types of boride and carbide phases can form in each track of the clad layer. These changes demonstrate the potential for tuning the properties of these coating by controlling the processing conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Evolution of microstructure and properties in laser cladding of a Ni-Cr-B-Si hardfacing alloy

Hemmati

Ocelík

Hosson

2011

Surface Effects and Contact Mechanics X

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“…1,2) However, laser cladding technique has some disadvantages, e.g., high residual stress in the coating during the solidification stage because there are great differences in mechanical and thermal properties of different phases (matrix and reinforcement in the coating) or layers of materials (coating and substrate), which will eventually result in peeling or cracking. [3][4][5] In addition, a non-uniform stress distribution in the coating is a potential factor influencing the induction of localized corrosion. A lot of work has been carried out on fabrication of the carbide cermet coating on steel substrate.…”

Section: Introductionmentioning

confidence: 99%

“…However, high cracking susceptibility of the hardfacing coatings using laser cladding limits its application. 5) Carbides have been considered to be an ideal reinforcement for the cermet coating due to high hardness and high wear resistance. Various Carbides, such as TiC, 6) Cr 3 C 2 , 7) WC, 3) Cr 7 C 3 -VC 8) and WC-Cr 3 C 2 , 9) have been selected as reinforcement in the cermet coatings using laser cladding method.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Laser-clad Mo<sub>2</sub>NiB<sub>2</sub> Cermet Coating on Low Carbon Steel Substrate

Zhong

et al. 2015

ISIJ Int.

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A Mo 2 NiB 2 cermet coating on low carbon steel substrate was fabricated by laser cladding technique. The coating consisted of γ -(Fe, Ni) as a metallic matrix binder and Mo 2 NiB 2 particles as a reinforced phase distributed uniformly in the microstructure. Corrosion behavior of the coating was investigated and the commercial 1Cr, 304SS, and G3 were used for comparison. G3 exhibited the highest corrosion resistance and 1Cr the lowest corrosion resistance, whereas 304SS and the coating exhibited the intermediate and similar corrosion resistance. However, the severe pitting corrosion which was observed in 304SS did not exist for the coating.

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“…Due to the small melting pool, large temperature gradient, narrow bonding zone and high thermal stress, cracks can be easily nucleated, especially in thick metallic coatings [1,2]. To prevent cracking is one of the most important issues from the preparation and industrial points of view [3][4][5]. Therefore an evaluation of residual stresses in laser clad coating at a micrometer scale provides useful information about the whole profile of internal stresses inside laser clad coating.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of residual stresses in laser clad coating at the micrometer scale

Furár

Ocelík

Hosson

2011

Surface Effects and Contact Mechanics X

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Residual stresses may have beneficial or detrimental effects to the materials properties and therefore precise knowledge and control of residual stresses are of high practical relevance. For the stress-relaxation measurement at a micro level we explored the slit milling (crack compliance) method using Focused Ion Beam (FIB) to release local strain induced by internal stresses and Digital Image Correlation (DIC) of SEM images taken before and after stress release to register it. The method allows us to measure stress components through the entire area of laser clad coating as a function of laser clad depth. We used: (i) 3.3 kW IPG fiber laser for cladding of tool steel, (ii) LYRA Tescan dual beam system with Focused Ion Beam and Electron Beam guns like milling-imaging instrument, respectively, (iii) Aramis GOM GmbH Digital Image Correlation for surface displacements registration. Finally, reducing the noise by using the appropriate magnification, facets size, resolution and by applying of integration method during collecting of SEM images we were able to increase sensitivity for lowest detectable displacement (~ 1nm).

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Investigation on the microstructure and cracking susceptibility of laser-clad V2O5 /NiCrBSiC alloy coatings

Cited by 82 publications

References 11 publications

Evolution of microstructure and properties in laser cladding of a Ni-Cr-B-Si hardfacing alloy

Evolution of microstructure and properties in laser cladding of a Ni-Cr-B-Si hardfacing alloy

Corrosion Behavior of Laser-clad Mo<sub>2</sub>NiB<sub>2</sub> Cermet Coating on Low Carbon Steel Substrate

Evaluation of residual stresses in laser clad coating at the micrometer scale

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