Effects of tungsten carbide thermal spray coating by HP/HVOF and hard chromium electroplating on AISI 4340 high strength steel

Nascimento, Marcelino P.; Souza, Renato Chaves; Miguel, I. M.; Pigatin, Walter Luis; Voorwald, Herman Jacobus Cornelis

doi:10.1016/s0257-8972(00)01148-8

Cited by 127 publications

(52 citation statements)

References 12 publications

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“…Although such a coating gives rise to an improvement in the substrate wear resistance, it occurs at the expense of a decrease in the fatigue performance, in comparison to the uncoated parts [3][4][5][6][7][8][9][10]. Therefore, the qualification of a thermal spray coating employed as a feasible replacement of EHC requires the evaluation of the effect of such a coating on the fatigue properties of the substrate, particularly in critical components such as aircraft engines, for which high cycle fatigue represents the most important failure mechanism [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying

Barbera-Sosa

Santana

Villalobos-Gutiérrez

et al. 2013

Surface and Coatings Technology

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The fatigue behavior of a SAE 4340 steel, coated with a 50% WC-10Co-4Cr/50% Colmonoy 88 deposit, by high velocity oxygen fuel (HVOF) thermal spray, has been investigated. The change in the maximum alternating stress with the number of cycles to fracture has been described by means of the relationship advanced by Stromeyer. A fractographic analysis has been carried out on some representative fracture surfaces, by means of scanning electron microscopy (SEM) techniques. The mechanical properties of the coating were characterized by means of nanoindentation tests. The results indicate that the coating is highly heterogeneous. Its deposition gives rise to a decrease in the fatigue strength of the substrate of ∼ 30%, in comparison with the uncoated substrate. The decrease in fatigue strength is due to the presence of stress concentrators at the substrate-coating interface, as well as the intrinsic characteristics of the coating.

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Section: Introductionmentioning

confidence: 99%

“…In this sense, a number of investigations have shown that although WC-Co and WC-Ni coatings deposited by HVOF thermal spray give rise to a decrease in the fatigue properties of 4340 steel substrates, it is less than that produced by EHC [8,9,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying

Barbera-Sosa

Santana

Villalobos-Gutiérrez

et al. 2013

Surface and Coatings Technology

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“…As indicated in Table I and Refs. [25][26][27] , electroplated hard chrome application generally causes some debit to the fatigue life of a component. However, there is no uniform conclusion as to the effect of TS processing on fatigue behavior of the coated system.…”

Section: Fatigue Of Coated Systemsmentioning

confidence: 99%

“…Substrate surface preparation and residual stress profiles within the coating and substrate play a strong role and both are effected by material choice, process selection, and operating parameters. [25][26][27][28] Understanding and controlling the driving mechanisms within TS coating processing to fatigue life extension offer the unique opportunity to design the coating as a structurally integrated aspect of the part.…”

Section: Fatigue Of Coated Systemsmentioning

confidence: 99%

Structurally Integrated, Damage-Tolerant, Thermal Spray Coatings

Vackel

Dwivedi

Sampath

2015

JOM

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Thermal spray coatings are used extensively for the protection and life extension of engineering components exposed to harsh wear and/or corrosion during service in aerospace, energy, and heavy machinery sectors. Cermet coatings applied via high-velocity thermal spray are used in aggressive wear situations almost always coupled with corrosive environments. In several instances (e.g., landing gear), coatings are considered as part of the structure requiring system-level considerations. Despite their widespread use, the technology has lacked generalized scientific principles for robust coating design, manufacturing, and performance analysis. Advances in process and in situ diagnostics have provided significant insights into the process-structure-property-performance correlations providing a framework-enhanced design. In this overview, critical aspects of materials, process, parametrics, and performance are discussed through exemplary studies on relevant compositions. The underlying connective theme is understanding and controlling residual stresses generation, which not only addresses process dynamics but also provides linkage for process-property relationship for both the system (e.g., fatigue) and the surface (wear and corrosion). The anisotropic microstructure also invokes the need for damage-tolerant material design to meet future goals.

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“…An important characteristic of chromium electroplated deposits is high magnitude of tensile residual stresses, which increase with the thickness of the deposit (Jones 1989, Dubpernell & Lowenheim 1968, Kuo & Wu, 1996. These stresses are relieved by local micro-cracking during the process of electroplating (Kuo & Wu 1996, Nascimento et al, 2001. High tensile residual stresses and large density of micro-cracks present in the electroplated deposits are responsible for reduction in its fatigue strength (Nascimento et al, 2001).…”

Section: Martensite Formation On Laser Treated Surface Of Aisi 1040 Smentioning

confidence: 99%

Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

Ganesh

Nagpure

Kaul

et al. 2015

SET

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Non-destructive characterization of surface microstructure of an engineering component is an important parameter to assess its fitness to function in the given service conditions. The paper describes various case studies performed in authors' laboratory involving use of portable X-ray diffraction based residual stress analysis system to examine and understand the micro-structural state of the investigated surface. A significant decrease in full width at half maximum (FWHM) of gamma(311) diffraction peak from about 4.2° in the cold worked state to about 2.5° in the annealed/surface melted state was recorded for austenitic stainless steel. In case of 0.4% carbon steel there is sharp increase in FWHM of alpha(211) diffraction peak from about 2° in the as received condition to about 5-6° in the laser hardened condition. Crystallographic texture developed during electro-plating of chromium on stainless steel, could be detected from the strong intensity of alpha (211) peak of chromium at about 19° to the surface normal with respect to all other X-ray inclination angles (ѱ) during residual stress measurement. The results show that FWHM and intensity variation of the diffraction peak are two sensitive parameters for characterization of surface microstructure. Change in FWHM has been used to detect machining-induced cold deformation and evolution of re-crystallized grains in austenitic stainless steel and formation of hard martensite in laser transformation hardened ferritic steel. Variation in the intensity of diffracted peak with respect to X-ray inclination angle provided valuable information regarding crystallographic texture in hard chrome plated deposits.

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Effects of tungsten carbide thermal spray coating by HP/HVOF and hard chromium electroplating on AISI 4340 high strength steel

Cited by 127 publications

References 12 publications

Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying

Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying

Structurally Integrated, Damage-Tolerant, Thermal Spray Coatings

Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

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