Structure of surface layers produced by non-vacuum electron beam boriding

“…Unlike different rolling schemes (no-slip rolling, rolling with constant slip, etc.) (Ref 14-17 and references therein), there are not so many published works discussing cyclic strength of materials under pulsating non-impact contact load ( Ref 13,[18][19][20][21] and there are only single data about the cyclic loading of NiCrBSi coatings according to the specified scheme ( Ref 22). In the meantime, the given scheme of contact-fatigue tests may be effective for evaluation of contact endurance of materials after various surface-related and strengthening treatments.…”

Section: Introductionmentioning

confidence: 97%

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

Savrai

Makarov

Соболева

et al. 2016

J. of Materi Eng and Perform

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The behavior of NiCrBSi coatings obtained by laser cladding from powders with various chromium, carbon and boron contents has been investigated under contact loading through microindentation using a Vickers indenter and via non-impact cyclic loading as per ''sphere-to-surface'' contact scheme. The phase composition of the coating containing 0.48% C, 14.8% Cr, 2.1% B is c + Ni 3 B + Cr 23 C 6 and that of the coating containing 0.92% C, 18.2% Cr, 3.3% B is c + Ni 3 B + Cr 7 C 3 + CrB. The established restrictions of the processes of plastic deformation and cracking for the more heavily alloyed and harder coating under contact fatigue loading are substantially due to its increased ability to deform predominantly in the elastic region under the used cyclic loading conditions. This is indicated by the obtained microindentation data and, therefore, the microindentation method (one-time indentation) can be used to assess the ability of the laser clad NiCrBSi coatings to withstand repeated contact loads.

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“…The electron beam treatment of the samples was carried out an ELV-6 electron accelerator produced by the Budker Institute of Nuclear Physics (Novosibirsk). The scheme of the electron accelerator is represented in [29,30]. Table 1 shows the technological parameters of the process.…”

Section: Introductionmentioning

confidence: 99%

“…The testing scheme is presented in [30]. The wear resistance was estimated based on the ratio of the linear dimension loss of the standard sample to the tested sample.…”

Section: Introductionmentioning

confidence: 99%

Structure and wear resistance of Ti-TiC-TiB layers obtained by non-vacuum electron beam cladding

2017

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Abstract. In this study structure and tribotechnical properties of cp-titanium after non-vacuum electron beam cladding of powder mixture containing boron carbide were investigated. Structural investigations were carried out using optical and scanning electron microscopy and X-ray analysis. The thickness of cladded layers was 1.3…2.5 mm. The beam moving speed was not influence the phase composition of coatings. The main phases of the surface layers were α-titanium (αʹ-titanium), titanium carbide TiC and titanium boride TiB. It was determined that the average value of microhardness of the samples formed with the speed 25 mm/s was three times higher in comparison with substrate metal. A decrease in the beam moving speed led to an increase in the heat input per unit area and was accompanied by a reduction in the coating microhardness. To evaluate the wear resistance, friction test of the obtained materials against fixed abrasive particles was performed. The maximum relative wear resistance was exhibited by the coatings after cladding of 20 wt. % boron carbide and 30 wt. % titanium with the beam moving speed of 25 mm/s. Their wear resistance was 1.53 times higher as compared to cp-titanium.

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Structure of surface layers produced by non-vacuum electron beam boriding

Cited by 61 publications

References 17 publications

Structure and properties of TiB-TiC-Ti layers fabricated on cp-titanium substrates by electron beam cladding

Structure and properties of TiB-TiC-Ti layers fabricated on cp-titanium substrates by electron beam cladding

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

Structure and wear resistance of Ti-TiC-TiB layers obtained by non-vacuum electron beam cladding

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