Influence of beam power on the surface architecture and corrosion behavior of electron-beam treated Co-Cr-Mo alloys

Valkov, Stefan; Parshorov, Stoyan; Andreeva, A.; Rabadzhiyska, S; Nikolova, Maria P.; Bezdushnyi, R.; Petrov, P.

doi:10.1016/j.nimb.2021.03.007

Cited by 9 publications

(8 citation statements)

References 45 publications

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“…As already mentioned, after the application of these technologies, the heating and cooling rates are quite high (about 10 4 -10 5 K/s), and these conditions are known as the highly non-equilibrium conditions. The highly non-equilibrium conditions of the used surface modification technique are considered a prerequisite for the formation of a crystallographic texture and preferred crystallographic orientation [11,21]. Moreover, these effects are typical for the electron-beam-modified surfaces of metals and alloys, where similar results are demonstrated in other studies [22].…”

Section: Resultsmentioning

confidence: 68%

“…This could be considered a reason for the reduction in the hardness of the surface of the specimen treated by a beam power of 1200 W. The Young's modulus of the untreated specimen is about 110 GPa and increases to about 153 GPa after the application of the electron beam modification procedure with the beam power of 600 W. The rise in the modulus of elasticity could be attributed to the formation of a crystallographic texture and the reorientation of microvolumes. It has already been mentioned that the application of this technique for surface modification can form a preferred crystallographic orientation and reorient the microvolumes of the modified material [11,21]. The results of the XRD experiments showed that the intensities of the observed diffraction maxima significantly differ concerning the initial material and electron-beam-surface-modified alloy.…”

Section: Resultsmentioning

confidence: 94%

“…Their results showed that the tribological properties were improved and the surface roughness was reduced. Similarly, Valkov et al [11] studied the influence of an electron beam treatment procedure on the corrosion properties of Co-Cr-Mo alloys. The results showed that the aforementioned chemical properties of the alloy were significantly improved after the application of the maximal value of the beam power of 750 W, with the sample moving at a speed of 5 mm/s.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the aforementioned chemical properties of the alloy were significantly improved after the application of the maximal value of the beam power of 750 W, with the sample moving at a speed of 5 mm/s. The researchers mentioned that the main reasons for this enhancement were the formation of the preferred crystallographic orientation and the elimination of pores, cracks, and other structural defects [11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Electron Beam Surface Modification on the Plasticity of Inconel Alloy 625

Valkov,

Kotlarski,

Parshorov

et al. 2024

Coatings

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In the present work, we present results on the influence of electron beam surface modification on the resistance to plastic deformation and plasticity of Inconel alloy 625. During the treatment procedure, the electron beam currents were 10 and 20 mA, corresponding to beam powers of 600 W and 1200 W. The structures of the modified specimens were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The nanohardness and Young’s modulus were studied through nanoindentation experiments. The plasticity of the treated materials as well as of the untreated ones was studied through an evaluation of H3/E2, which points to resistance to plastic deformation. The results obtained show that the electron beam surface modification procedure leads to a reorientation of microvolumes and the formation of a preferred crystallographic orientation. The surface treatment of the samples using an electron beam with a power of 600 W did not lead to major changes in the structures of the samples. However, the use of a beam with a power of 1200 W led to the formation of a clearly separated modified zone with a thickness in the range of 13 to 15 μm. The Young’s modulus increased from about 100 to 153 GPa in the case of electron beam surface modification using the lower-power electron beam. The application of the higher-power electron beam did not lead to a significant change in the modulus of elasticity as compared to the untreated specimen. Also, it was found that the treatment procedure pointed to a decrease in nanohardness when the maximum power of the electron beam was applied. The resistance to plastic deformation, i.e., the H3/E2 ratio, showed that the ratio decreased significantly in both cases of electron beam surface modification, pointing to an improvement in the plasticity of the surface of the Inconel alloy 625.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Electron Beam Surface Modification on the Plasticity of Inconel Alloy 625

Valkov,

Kotlarski,

Parshorov

et al. 2024

Coatings

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show abstract

“…The improvement of the surface properties of implant materials could be achieved by different surface modification methods [9][10][11][12]. In general, methods for surface modification of implant materials can be classified as physical, chemical, and mechanical [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Impact of Beam Deflection Geometry on the Surface Architecture and Mechanical Properties of Electron-Beam-Modified TC4 Titanium Alloy

et al. 2023

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This paper aims to investigate the impact of beam deflection geometry on the structure, surface architecture, and friction coefficient of electron-beam-modified TC4 titanium alloys. During the experiments, the electron beam was deflected in the form of different scanning geometries, namely linear, circular, and matrix. The structure of the treated specimens was investigated in terms of their phase composition by employing X-ray diffraction experiments. The microstructure was studied by scanning electron microscopy (SEM). The surface architecture was examined by atomic force microscopy (AFM). The friction coefficient was studied by a mechanical wear test. It was found that the linear and circular deflection geometries lead to a transformation of the phase composition, from double-phase α + β to α’ martensitic structure. The application of a linear manner of scanning leads to a residual amount of beta phase. The use of a matrix does not tend to structural changes on the surface of the TC4 alloy. In the case of linear geometry, the thickness of the modified zone is more than 800 μm while, in the case of EBSM using circular scanning, the thickness is about 160 μm. The electron-beam surface modification leads to a decrease in the surface roughness to about 27 nm in EBSM with linear deflection geometry and 31 nm in circular deflection geometry, compared to that of the pure TC4 substrate (about 160 nm). The electron-beam surface modification of the TC4 alloy leads to a decrease in the coefficient of friction (COF), with the lowest COF values obtained in the case of linear deflection geometry (0.32). The results obtained in this study show that beam deflection geometry has a significant effect on the surface roughness and friction coefficient of the treated surfaces. It was found that the application of a linear manner of scanning leads to the formation of a surface with the lowest roughness and friction coefficient.

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Identification and development of a new local corrosion mechanism in a Laser Engineered Net Shaped (LENS) biomedical Co-Cr-Mo alloy in Hank’s solution

et al. 2022

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Influence of beam power on the surface architecture and corrosion behavior of electron-beam treated Co-Cr-Mo alloys

Cited by 9 publications

References 45 publications

Effect of Electron Beam Surface Modification on the Plasticity of Inconel Alloy 625

Effect of Electron Beam Surface Modification on the Plasticity of Inconel Alloy 625

Impact of Beam Deflection Geometry on the Surface Architecture and Mechanical Properties of Electron-Beam-Modified TC4 Titanium Alloy

Identification and development of a new local corrosion mechanism in a Laser Engineered Net Shaped (LENS) biomedical Co-Cr-Mo alloy in Hank’s solution

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