Pulsed laser processed NiCrFeCSiB/WC coating versus coatings obtained upon applying the conventional re-melting techniques: Evaluation of the microstructure, hardness and wear properties

Škamat, Jelena; Černašėjus, Olegas; Decker, Živilė; Višniakov, Nikolaj

doi:10.1016/j.surfcoat.2019.06.080

Cited by 21 publications

(15 citation statements)

References 20 publications

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“…The microstructure of laser-processed layers differs strongly from that of the assprayed. As shown earlier [31], the cross-section of each pass exhibits a layered microstructure consisting of W-rich dendrites uniformly distributed in the Ni-rich matrix. When a pulsed laser is used, the melting process runs point-by-point with points overlapping, determined by the operating speed.…”

Section: Microstructure Of Laser-processed Coatingssupporting

confidence: 56%

“…The laser spot size was 0.3 mm, laser current varied between 120 and 170 A, and processing speed-between 100 and 400 mm/min, providing processing in a melting mode. More detailed information regarding the methodology for laser processing parameters calculation and used physical properties of the materials can be found in [31]. The summary for samples coding is presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Using the hand of a manipulator for the laser head movement, the remelting process may be performed for a surface of various complexity. Flame-sprayed deposits provide stable coating thickness and uniform distribution of WC particles across the coating [31]. They are normally more porous and less adhered to a substrate compared with HVOF or PTA; however, subsequent laser remelting eliminates porosity and provides metallurgical bonds.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous article [31], we presented the results of comparing flame-sprayed Ni-based/WC coatings obtained by remelting by conventional methods (flame, furnace, induction) and a laser beam using Nd:YAG laser with wavelength 1064 nm. The microstructure and hardness of the conventionally remelted coatings were similar and were mainly predetermined by the heating duration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

et al. 2021

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In the present study, pulsed laser post-processing was applied to improve the properties of the thermally sprayed NiCrCoFeCBSi/40 wt.% WC coatings. The powder mix was deposited onto a mild steel substrate by flame spray method and then the as-sprayed coatings were processed by Nd:YAG laser. The peak power density applied was between 4.00 × 106 and 5.71 × 106 W/cm2, and the laser operating speed ranged between 100 and 400 mm/min, providing processing in a melting mode. Scanning electron microscopy, energy dispersive spectroscopy, Knop hardness measurements, and “ball-on-disc” dry friction tests were applied to study the effect of the processing parameters on the geometry of laser pass and microstructure, hardness, and tribology of the processed layers. The results obtained revealed that pulsed laser processing provides a monolithic remelted coating layer with the microstructure of ultrafine, W-rich dendrites in Ni-based matrix, where size and distribution of W-rich dendrites periodically vary across remelted layer depth. The composition of W-rich dendrites can be attributed to a carbide of type (W, Cr, Ni, Fe)C. The cracks sensitivity of coatings was visibly reduced with the reduction of power density applied. The hardness of coatings was between ~1070 and ~1140 HK0.2 and correlated with microstructure size, being dependent on the processing parameters. The friction coefficient and wear rate of coatings during dry sliding were reduced by up to ~30% and up to ~2.4 times, respectively, after laser processing.

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Section: Microstructure Of Laser-processed Coatingssupporting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

et al. 2021

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“…WC is widely used as a reinforcement in Fe-based alloy (Ref 1 ), Ni-based alloy (Ref 2 , 3 ), and Co-based alloy (Ref 4 , 5 ). WC + Ni-based composites generally have the advantages of high hardness, high temperature resistance, and excellent wear resistance and have been widely used in mining machinery (Ref 6 – 9 ). Laser deposition is an effective way to fabricated composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

Chen

Pan

et al. 2020

J. of Materi Eng and Perform

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This paper reports the effect of post-heat treatment (PHT) on laser-deposited WxC + Ni-based composite thin walls. The PHT at 700, 800, and 900°C was conducted to modify the microstructure and mechanical properties of the composite. The results showed that the as-deposited composite had a weak flexural strength and plasticity due to the brittle nature of the eutectic phase. The eutectic phase consisted of M 7 C 3 , M 2 C, and a small amount of the c phase. However, after PHT at a certain temperature (e.g., 700 or 800°C), the eutectic phase gradually disappeared, and carbides, such as M 7 C 3 and M 2 C, tended to be distributed uniformly in the c matrix, which improved the flexural strength of the composite. Nevertheless, after the PHT at 900°C, the flexural strength of the composite displayed a downward trend, which was mainly because of the severe softening of the c phase. In addition, the plasticity of this composite continuously improved as the eutectic phase disappeared and the c phase softened. Based on the above results, we proposed a PHT at 800°C for 1 h as an optimal process for this WxC + Ni-based composite.

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On the Microstructure and Wear Behavior of Fe‐Based/B₄C Composite Coating Processed by Vacuum Cladding

Luo

Feng

et al. 2021

steel research int.

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To increase the service life of mechanical parts under severe wear environment, composite coatings with wear resistance are required. Fe‐based/B4C composite coating is fabricated on the surface of ASTM 1045 steel by vacuum cladding and the microstructure, hardness, and wear behavior of the coating are investigated. The results show that the coating is mainly composed of the coating matrix of α‐Fe, [Fe, Ni] solid solution, and the strengthening phases of eutectic borides M2B and carboborides M23(C, B)6 with irregular block distribution. The dispersion strengthening and solution strengthening of the coating microstructures improve the overall hardness distribution of the coating, the microhardness, and macrohardness of the coating are greatly improved, which are better than that of quenched and tempered ASTM 1045 steel (QT45 steel) and NM400 steel. The results of abrasive wear test under different loads (130 N/45 N) indicate that wear scar of the coating become shorter and shallower due to the antiabrasive grinding effect of strengthening phases, and wear resistance is significantly greater than that of QT45 steel and NM400 steel. The main wear mechanisms associate with QT45 steel and NM400 steel involve plastic deformation and microcutting, whereas the coating is mainly a mix mode of plastic cutting and fatigue spalling.

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Pulsed laser processed NiCrFeCSiB/WC coating versus coatings obtained upon applying the conventional re-melting techniques: Evaluation of the microstructure, hardness and wear properties

Cited by 21 publications

References 20 publications

Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

On the Microstructure and Wear Behavior of Fe‐Based/B₄C Composite Coating Processed by Vacuum Cladding

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Pulsed laser processed NiCrFeCSiB/WC coating versus coatings obtained upon applying the conventional re-melting techniques: Evaluation of the microstructure, hardness and wear properties

Cited by 21 publications

References 20 publications

Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

Effect of Laser Processing Parameters on Microstructure, Hardness and Tribology of NiCrCoFeCBSi/WC Coatings

Effect of Post-Heat Treatment on the Microstructure and Mechanical Properties of Laser-Deposited WxC + Ni-Based Composite Thin Walls

On the Microstructure and Wear Behavior of Fe‐Based/B4C Composite Coating Processed by Vacuum Cladding

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On the Microstructure and Wear Behavior of Fe‐Based/B₄C Composite Coating Processed by Vacuum Cladding