The Behavior of Gas Powder Laser Clad NiCrBSi Coatings Under Contact Loading

Savrai, R. A.; Makarov, A. V.; Соболева, Н. Н.; Malygina, I. Yu.; Осинцева, А. Л.

doi:10.1007/s11665-016-1925-7

Cited by 31 publications

(7 citation statements)

References 33 publications

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“…It is obvious from the data shown in Fig. 2a that the average contact spot diameter after 10 4 cycles of loading is 2.19 mm, which exceeds that of the as-clad Ni-18.2Cr-3.3B-4.2Si coating (1.88 mm), and it is on the level with the less heavily alloyed Ni-14.8Cr-2.1B-2.9Si coating (2.12 mm) [9]. As the number of contact loading cycles grows to 5×10 5 , the contact spot diameter increases continuously, and as the number of cycles grows from 8×10 5 to 10 6 , the size of contact damages increases sharply.…”

Section: Resultsmentioning

confidence: 83%

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Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Savrai¹,

Makarov²,

Горкунов³

et al. 2018

AIP Conference Proceedings

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The paper studies the applicability of eddy-current technique to testing fatigue degradation in Ni-18.2Cr-3.3B-4.2Si coating, produced by gas powder laser cladding and subjected to additional high-temperature annealing at 1025 °C, under contact loading. It is demonstrated that eddy-current testing of fatigue degradation in Ni-18.2Cr-3.3B-4.2Si coating under contact loading after high-temperature annealing has certain limitations caused by the high brittleness of this coating. In this case, it is possible to test only a sharp increase in the sizes of contact damages, which occurs at 8×10 5 cycles under these loading conditions and results from the formation of a great number of peripheral ring cracks in the fracture zone; the eddy-current readings α decrease due to the increasing electrical resistivity of the coating. Testing can be performed by eddy-current measurements at high excitation frequencies of an eddy-current transducer (f=72-120 kHz), when the effect of the ferromagnetic steel base on the eddy-current readings α is minimum.

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Section: Resultsmentioning

confidence: 83%

“…Two-layer laser cladding of the surface of a steel plate with NiCrBSi alloy powder results in a coating with an average microhardness of 970±40 HV0.1, whose metal matrix includes a Ni-based γ-solid solution and eutectics consisting of a γ-phase and Ni 3 B boride, the strengthening phases being Cr 7 C 3 carbide and CrB boride [9].…”

Section: Resultsmentioning

confidence: 99%

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Savrai¹,

Makarov²,

Горкунов³

et al. 2018

AIP Conference Proceedings

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show abstract

“…The clad coating NiCrBSi over its entire thickness (1.4 -1.5 mm after grinding) displays a fairly uniform distribution of structural components, as well as approximately constant levels of microhardness and abrasive wear resistance [11,12].…”

Section: Fabrication Of Heat-resistant Nicrbsi Coatings By Combined Lmentioning

confidence: 99%

“…However, the application of stabilizing annealing is most effective for technologies that form the metastable structures in coatings that are prone to active transformations during heat treatment [18]. This concerns not only the laser cladding [11][12][13]16,18], but also the technology of thermal spraying of composite Ni-based coatings on mold copper plates for CCM [8,9], when ultrahigh solidification rates of sprayed disperse particles is occurring due to intense heat transfer to the copper alloy.…”

Section: Fabrication Of Heat-resistant Nicrbsi Coatings By Combined Lmentioning

confidence: 99%

Wear-resistant nickel-based laser clad coatings for high-temperature applications

et al. 2019

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The effect of high-temperature processing on laser clad Ni-based coatings is studied. Annealing at 1025°C forms thermally stable framework structures with large chromium carbides and borides. As a result, improved hardness and wear resistance of the coating are maintained when heated to 1000°C. Stabilizing annealing also increases the frictional thermal resistance of the NiCrBSi coating. Under high-speed (3.1-9.3 m / s) sliding friction, when the surface layer temperature reaches about 500 -1000°С and higher, the wear resistance of the coating increases by 1.7 -3.0 times. The proposed approach to the formation of heat-resistant coatings is promising, in particular, for a hot deformation tool and other components of metallurgical equipment operating under high thermal and mechanical loads. Such products include crystallizer walls of continuous casting machines. For the walls, the development of laser cladding technology for wear-resistant composite coatings on copper alloys is relevant as an alternative to thermal spraying. The cladding of composite NiBSi-WC coatings of 0.6 and 1.6 mm thickness on a Cu-Cr-Zr bronze substrate heated to 200 -250°C with a diode laser is considered. The presence of boron causes the formation of the W(C, B) carboboride phase, whose hardness is higher than that of WC in the initial powder. Depending on the thickness of coatings and, accordingly, on the duration of heating and the subsequent cooling, the process of secondary carboborides precipitation from the solid solution can be suppressed (in the "thin" coating) or activated (in the "thick" coating). This leads to a higher wear resistance under friction sliding 1.6 mm thickness coating.

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“…NiCrBSi coatings produced by laser cladding are used for surface hardening and restoration of worn machine part surfaces [1][2][3][4][5]. However, layers formed by gas powder laser cladding are characterized by significant surface roughness, this being currently eliminated, as a rule, by disk grinding.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of a laser-clad NiCrBSi coating hardened by frictional finishing

Makarov

Соболева

Malygina

2017

AIP Conference Proceedings

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Eddy-current testing of fatigue degradation upon contact fatigue loading of gas powder laser clad NiCrBSi-Cr 3 C 2 composite coating Abstract. Frictional treatment decreases surface roughness of a NiCrBSi laser coating and increases its microhardness and abrasive wear resistance. Even after softening annealing at 900 С, the coating subjected to frictional treatment preserves its advantage in hardness and wear resistance over the original clad coating. Annealing at 1000 С after frictional treatment ensures less effective growth of the hardness and wear resistance of the coating as compared to annealing of the undeformed coating due to the limited precipitation of large Cr 23 C 6 carbides on the deformed surface, which form a wear-resistant framework.

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The Behavior of Gas Powder Laser Clad NiCrBSi Coatings Under Contact Loading

Cited by 31 publications

References 33 publications

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Eddy-current testing of fatigue degradation in additionally heat-treated gas powder laser clad NiCrBSi coating under contact fatigue loading

Wear-resistant nickel-based laser clad coatings for high-temperature applications

Thermal stability of a laser-clad NiCrBSi coating hardened by frictional finishing

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