Microstructure and phase composition of Fe-based self-fluxing alloy coatings formed by laser remelting and superficially modified by laser alloying with B4C particulates

Feldshtein, E.; Kardapolava, Marharyta; Dyachenko, O. V.

doi:10.4149/km_2015_3_155

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Laser alloying can be used as well when new parts should be coated as when worn parts should be regenerated. Different materials may be used for this purpose: boron carbides (Yilbas et al [5]; Mazahery and Shabani [6]; Feldshtein et al [7]), tungsten carbides (Dobrzański et al [8]), molybdenum and zirconium oxides (Ng et al [9]), TiB 2 -TiC-Al 2 O 3 type of composites (Masanta et al [10]) and other. Many-component structures that are formed of additives affect the microhardness, stresses, wear and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

On the Bonding Strength of Fe-Based Self-Fluxing Alloy Coating Deposited by Different Methods on the Steel Substrate

Feldshtein

Kardapolava

Dyachenko

2018

International Journal of Applied Mechanics and Engineering

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In the present paper, the bonding strength of Fe-based self-fluxing alloy coating deposited by plasma spraying, gluing and laser remelting and alloying on the steel substrate have been investigated. When flame melting, a globular structure is formed. Against the background of the solid solution carbide-boride phases are clearly distinguishable, between which the Fe–Fe2B and Fe–FeB eutectic colonies are situated. Laser remelting leads to the formation of metastable structures, reinforced with dendrites, consisting of alloyed Fe-α and Fe-γ. At the low laser beam speeds the coating is melted completely with the formation of a cast structure with the dendrites. When the laser beam speed is increased, the dendritic structure gets fragmented. Structures of coatings alloyed with B4C and remelted by the laser beam vary with the increase of the spot speed. The bonding strength of coating without subsequent remelting decreases by 4–5 times in comparison with remelted. The bonding strength of the reinforced glue coating has adhesive and adhesive-cohesive character. When the load increases in the coating, microcracks develop, which gradually spread to the center of the bonding surface. For plasma coatings after laser remelting without additional alloying, the maximum bonding strength is observed with the minimum laser beam speed. With increasing the laser beam speed it decreases almost 1.5 times. In glue coatings reinforced with B4C particulates by laser remelting, the bonding strength is lower by 1.2–1.4 times in comparison with plasma coating.

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Section: Introductionmentioning

confidence: 99%

On the Bonding Strength of Fe-Based Self-Fluxing Alloy Coating Deposited by Different Methods on the Steel Substrate

Feldshtein

Kardapolava

Dyachenko

2018

International Journal of Applied Mechanics and Engineering

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“…Effects of various radiations on ferrite material viz. swift heavy ion radiation [1], gamma ray radiation [2], neutron radiation [3], CO 2 laser irradiation [4,5] have been reported in literature. All these irradiation effects are known to produce technologically important modifications in the materials system selected.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microsecond Pulse Laser Modification on Electromagnetic Properties of Grain Oriented Silicon Steel

Puchý

Kováč

Petryshynets

et al. 2017

MSF

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A microsecond pulsed laser beam was used to local magnetic domain modification of electrical grain oriented silicon steel. It was carried out using three different laser pulse regimes: a single pulse laser regime, a multipulse laser regime and a multipulse laser regime with modulation of laser pulses. The laser processing variables were pulse energy and and number of pulses. The samples were tested for nanohardness and coercivity before and after laser treatment. Light optical microscopy, scanning electron microscopy and magnetic force microscopy were used to observe the cross-sectional profile, surface of the samples, and magnetic domain visualization, respectively. The local laser treatment of grain oriented silicon steel surface has been studied in terms of its influence on the magnetic domains and coercivity. It was found that laser-modified samples showed coercivity improvement in comparison to the non-treated samples. The most significant improvement in coercivity was obtained in the modulated multipulse regime and negligible improvement in the single pulse laser regime. Three main effects responsible for the observed improvement were identified, namely: magnetic domain refinement, influence of number of laser pulses and shape of laser HAZ profile. The present work highlights on differences in the magnetic domain structure, microstructure of the laser modified material and basic electromagnetic and mechanical properties. In present study, the pulse laser surface processing was presented as a useful energy efficient alternative to other techniques e.g. mechanical scribing, electrical discharge scribing, plasma jet scribing, etc. The refined magnetic domains in electrosteels are responsible for the observed low coercivity, which indicates perspective application of the investigated laser modified steels in the power transformer cores with lower core losses.

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Microstructure and phase composition of Fe-based self-fluxing alloy coatings formed by laser remelting and superficially modified by laser alloying with B4C particulates

Cited by 2 publications

References 21 publications

On the Bonding Strength of Fe-Based Self-Fluxing Alloy Coating Deposited by Different Methods on the Steel Substrate

On the Bonding Strength of Fe-Based Self-Fluxing Alloy Coating Deposited by Different Methods on the Steel Substrate

Effect of Microsecond Pulse Laser Modification on Electromagnetic Properties of Grain Oriented Silicon Steel

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