Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

Kumar, Vijay; Verma, Ravi; Chauhan, Kundan; Kumar, Rajeev

doi:10.1088/2051-672x/ac5c68

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…Water contact angles (WCA) observed for specimens 1, 2, 3 and 4, was 63.5°, 57.7°, 45°, and 64°respectively. Important factors affecting the wettability of a surface, are surface energy, surface roughness, and the presence of microstructural attributes [26,27]. Test results confirmed that by adding HEA to titanium increased wettability was observed.…”

Section: Wettabilitymentioning

confidence: 67%

Effect of reinforcement and sintering on dry sliding wear and hardness of titanium – (AlSi)0.5CoFeNi based composite

Kumar¹,

Raju²,

Naik³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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Owing to its weight-to-strength ratio, titanium is a widely used material, especially in gas turbine engines. It possesses a high melting point and corrosion resistance, however, exhibits poor wear resistance. An improvement in its tribological properties can be accomplished by the addition of a suitable reinforcement in metal matrix composite (MMC). In this research, titanium MMCs were fabricated through mechanical alloying (MA) followed by vacuum arc melting of 95% titanium reinforced with 5% of (AlSi)0.5CoFeNi high entropy alloy (HEA). Compaction was later done at 1000 MPa, while specimens were heat-treated at sintering temperatures of 900℃ and 1000℃, with varying sintering times of 1 hour and 2 hours at 10-4 millibar vacuum. Microhardness and sliding wear rate of reinforced HEA specimens exuded improvement when compared to the Ti 900℃ 2hr specimen. Owing to the reinforcement, a reduction in wear rate and more than 5% improvement in microhardness had been observed, at higher sintering temperatures. The improvement was attributed to the synergistic effect of sintering time and temperature during the density and wettability analysis which was supported by the morphological analysis.

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Section: Wettabilitymentioning

confidence: 67%

Effect of reinforcement and sintering on dry sliding wear and hardness of titanium – (AlSi)0.5CoFeNi based composite

Kumar¹,

Raju²,

Naik³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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“…The influence of LST as pre-processing of AISI 304 for coating was characterized by surface roughness, wear test, and scratch test. During the wear test, few microcracks were observed for high load values, and a reduced wear rate was confirmed [39]. LST could be the crucial parameter to contribute complete diffusion between the interlayer and the joining materials as it provides surface modification.…”

Section: Laser Surface Texturingmentioning

confidence: 76%

Investigation of mechanical properties of microwave welded SS304-SS202 lap joints

Samyal¹,

Bedi²,

Bagha³

2023

Phys. Scr.

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The joint between dissimilar materials is always challenging to develop through traditional techniques due to the different properties of the parent materials. However, a novel non-traditional route of joining similar and dissimilar materials through energy conversion and absorption has been developed called SMHH (selective microwave hybrid heating). It has gained much attention due to its unique heating abilities. In the present work, the lap joint between SS202-SS304 is developed through SMHH placing nickel powder as an interlayer. The lap joint was characterized mechanically through shear tests and microhardness. Since the sheared area of the joint is large, it is challenging to achieve a good joint. Thus, to develop a solid joint, laser surface texturing (LST) was introduced to the joining surfaces, and the joints were characterized. After LST was introduced, a fully diffused joint interlayer region was observed through scanning electron microscopy (SEM). The EDS results confirmed the complete metallurgical bonding occurred by the diffusion of elements across the weld zone. From the XRD spectrum, the formation of intermetallic compounds like FeNi, FeNi3, C3Fe7, and M23C6 were identified at the joint region. The mean microhardness of 355±10 HV was determined at the joint region of lap joints with LST. A lap joint with LST exhibits 217 MPa of shear strength, which is significantly higher than the joints without LST. Fractography of the shear failure specimens pointed out that partial heating of the interlayer caused incomplete bonding of the base metal and interlayer for without LST lap joints. However, mixed mode failure of SS202 near the overlap region of the LST lap joint occurred. It is concluded that the addition of LST on the lap joint has made a colossal impact on enhancing joint strength and intermetallic bonding.

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“…Kumar et al [6] in their recent work have proposed the addition of GNPs in WC-10Co-4Cr coating powder to improve the wear behaviour of AISI 304 steel substrate. After pin-on-disc and micro-scratch testing, it was observed that wear-resistance of the coated surface improved significantly as compared to bare steel substrate due to lubrication nature of GNPs.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that graphene possesses a twodimensional carbon honeycomb lattice with a single layer and the coating of such micro-structure is helpful to reduce co-efficient of friction and wear of the surface [7]. HVOF is an apt coating technique among the existing methods for applying the combination of WC-10Co-4Cr+GNP feedstock powder due to resultantly increased surface wear-resistance, greatest bond strength, and minimum porosity caused by high impact velocity [6,8,9]. In the HVOF approach, shorter in-flight exposure time and higher velocities reduce oxide formation and produce a smoother assprayed surface.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to other available conventional coating techniques like plasma spray, sputtering, chemical vapour deposition, and physical vapour deposition, the HVOF approach uses powder suspension as the raw material to deposit coating with a uniform elemental distribution and micro/nano-structure, besides it is very simple to use, inexpensive, and well suited for large-scale production [16]. In recent reported articles [6,17,18], micro-texturing employing lasers could improve the tribological aspect of the coating deposited to steel substrate. When compared to uncoated steel, WC-10Co-4Cr +GNP had superior wear and corrosion resistance, which contributes to its wider applicability.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the corrosion and wear of WC-10Co-4Cr + GNPs coating applied to HSLA DH-36 steel using HVOF

Kumar¹,

Verma²,

Kumar³

2022

Surf. Topogr.: Metrol. Prop.

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High strength low alloy (HSLA) steels offer unique properties and features that show their utility in harsh conditions. Wear and corrosion are concerns when using HSLA steel in shipbuilding and marine environment. In such harsh conditions, WC-10Co-4Cr is a suitable candidate for applying a protective coating to HSLA steel using High Velocity Oxy-Fuel (HVOF) to improve wear and corrosion resistance. The addition of graphene nano-platelets (GNPs) to WC-10Co-4Cr powder increased its mechanical qualities due to its unique properties such as low wear and excellent corrosion resistance. In this work, WC-10Co-4Cr + 3% GNP was coated on laser-treated DH-36 steel. The corrosion potential for these coatings on pre-laser textured with pitch-to-diameter ratio 1.67 was -0.437V compared to the pristine DH-36 was -0.821V; while corrosion current density was 0.143 × 10-3 & 5.362 × 10-6, respectively. Finally, the dry sliding wear test using the Pin-on-Disc (PoD) method, microhardness using the Vickers Indentor, and corrosion resistance using a potentiometer were utilised to analyse the coated surface. The wear resistance of steel coated with WC-10Co-4Cr + 3% GNPs was about 1.5 times compared to pristine substrate. Microstructure and morphology of corroded surfaces were examined using FE-SEM. The results reveal that GNPs act as a solid lubricant, improving the surface's wear resistance.

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Influence of laser texturing pre-treatment on HVOF-sprayed WC-10Co-4Cr+GNP coatings on AISI 304

Cited by 13 publications

References 44 publications

Effect of reinforcement and sintering on dry sliding wear and hardness of titanium – (AlSi)0.5CoFeNi based composite

Effect of reinforcement and sintering on dry sliding wear and hardness of titanium – (AlSi)0.5CoFeNi based composite

Investigation of mechanical properties of microwave welded SS304-SS202 lap joints

Analysis of the corrosion and wear of WC-10Co-4Cr + GNPs coating applied to HSLA DH-36 steel using HVOF

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