Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM

Pukasiewicz, Anderson Geraldo Marenda; Oliveira, Fernando Ratti de; Capra, André Ricardo; Paredes, Ramón Sigifredo Cortés

doi:10.1590/s0104-92242012000100010

Cited by 7 publications

(9 citation statements)

References 17 publications

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“…The higher porosity the lower cohesion in the coatings [39,53]. The microhardness of the coatings, measured in the transversal section was 312±16 HV0.3, which is consonant to the obtained by Pukasiewicz et al [34,47], confirming the replication of the laboratory properties on the in-situ application properties.…”

Section: Resultssupporting

confidence: 85%

“…The synergy cavitation/corrosion is presented by Mayer et al [39], interpreting the effective influence of the corrosion on the cavitation behavior of the material. However, for the remelted coatings, the same region of the severe cavitation erosion was selected, since the alloys FeMnCrSi in the condition of welded presented resistance close to the welded Co alloys [34,47,48] and had higher corrosion resistance than the substrates [49].…”

Section: Results For Thermal Spray Repairmentioning

confidence: 99%

“…The FeMnCrSi alloys sprayed were results of R&D project and are under patent [33]. These alloys as-sprayed and as remelted by PTA presented resistance to cavitation very close to alloys with Co [34,47,48], justifying their use.…”

Section: Carbon Steel Runner Eroded By Cavitation Uhegbmmentioning

confidence: 99%

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Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

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Tristante²,

Pukasiewicz

et al. 2021

Soldag. insp.

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Hydraulic runners are susceptible to failures by cracks or wear by erosion, corrosion, or cavitation. The modern runners are fabricated in carbon steel and martensitic stainless steel. Arc welding processes normally do the repair of eroded areas, or cracked parts. Each material or type of repair needs specific criteria, procedures, and precautions to guarantee their success and prevent future issues, like the recurrence of the cracks or reduction of the useful life of the runner by modifications of the original material. Wear-resistant coatings are applied by welding or by thermal spray processes, considering this last one has no metallurgical interaction with the material of the runner, keeping the original properties of the material. For several years the companies Copel GeT, Lactec, UTFPR, and UFPR collaborate on the study of different techniques, methods, and processes to repair hydraulic runners, this work aims to present a short compilation, and examples of some results obtained applied on real runners.

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Section: Resultssupporting

confidence: 85%

Section: Results For Thermal Spray Repairmentioning

confidence: 99%

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Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Váz

Tristante²,

Pukasiewicz

et al. 2021

Soldag. insp.

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“…Some examples of applications of the application of metallic and non-metallic materials are mentioned in the literature, as ceramic thermal barrier coating on different parts of gas turbines and internal combustion engines improve their efficiency and performance [1,2]; Aluminum, stainless steels, zinc, and other alloys coatings increase the corrosion resistance and consequently the life of offshore piping [3][4][5]; MCrAlY alloys coatings improve the resistance to hot corrosion and oxidation of gas turbines blades [6,7]; WC, TiC, SiC, and others carbides improve the wear resistance [7,8], or cavitation erosion resistance of hydraulic turbines. For this last purpose, some authors have studied FeMnCrSiNi austenitic alloys [9][10][11][12], which have some characteristics and properties adequate to absorb the energy from the cavitation phenomena without mass loss, where these properties are the pseudo-elasticity and the strain induced phase transformation [13][14][15]. The plume or jet of droplets in ASP is due to the fusion of wire format feedstock.…”

Section: Introductionmentioning

confidence: 99%

Study of Particle Properties of Different Steels Sprayed by Arc Spray Process

et al. 2020

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Thermally sprayed coatings are employed for many purposes, as corrosion protection, wear resistance improvement, resistance to high temperatures, and others. The coating performance depends on its morphology, which is composed by splats, pores, oxide inclusions, and entrapped unmelted or resolidified particles. In arc spray process (ASP), the heat source is the arc electric obtained from the contact of two consumable metallic wires with different electric potentials, and the carrier gas is the compressed air. The velocity, dimensions, and thermal characteristics of the droplets sprayed are related to the morphology and properties of the coating. The main goal of this research is to evaluate how the velocity, temperature, and particle size are modified by the chemical composition of different materials (carbon steel, stainless steels, and FeMnCrSiNi alloy). The intention is to predict how the modification of the process parameters will change the particles properties. The materials had similar behavior tendencies during the flight: the velocity increased to a peak value then decreased, but this maximum value was different for materials with different particle size. The particles’ size did not present significant differences during the flight; and the particles cooled down as they moved away from the gun, except the austenitic stainless steel and the FeMnCrSiNi alloy, which increased the droplets temperature during the travel. These alloys also presented more variation in chemical composition during flight.

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“…ASTM A743 CA6NM é um aço inoxidável martensítico muito utilizado na fabricação de turbinas hidráulicas devido a sua elevada tenacidade, entretanto apresenta restrições com relação às regiões recuperadas por soldagem (PUKASIEWICZ et al, 2012).…”

Section: Introductionunclassified

Corrosão microbiologicamente influenciada em superfícies metálicas expostas à água de processo industrial de usinas hidrelétricas.

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Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM

Abstract: Resumo ASTM A743-CA6NM é um aço inoxidável martensítico muito utilizado na fabricação de turbinas hidráulicas devido

Cited by 7 publications

References 17 publications

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Study of Particle Properties of Different Steels Sprayed by Arc Spray Process

Corrosão microbiologicamente influenciada em superfícies metálicas expostas à água de processo industrial de usinas hidrelétricas.

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