Influence of Plasma Remelting on the Microstructure and Cavitation Resistance of Arc-Sprayed Fe-Mn-Cr-Si Alloy

Pukasiewicz, Anderson Geraldo Marenda; Alcover, Paulo Roberto Campos; Capra, André Ricardo; Paredes, Ramón Sigifredo Cortés

doi:10.1007/s11666-013-0001-1

Cited by 16 publications

(19 citation statements)

References 16 publications

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“…Will et al [30] evaluated the cavitation resistance of 309LSi and Co-steel alloys coatings welded by PTA with different parameters of the pulsed current, resulting in the lowest erosion rate for the Cavitec alloy, 0.45 mg/h, welded with pulsed current 180/120 A and peak/base time 0.1/0.1 s. By the same process, but with current 160 A, da Cruz, Henke, and d'Oliveira [32] welded the FeMnCrSi alloy [33], obtaining erosion rate of 0.52 mg/h, aswelded, and 0.33 mg/h, after mechanical cold work post-treatment, which converted partially the phase austenite on martensite, increasing the hardness and cavitation resistance. Using the same PTA pulsed arc process, but with pulsed current 180/80 A and peak/base time 0.1/0.1 s, Pukasiewicz et al [34] remelted FeMnCrSi [33] alloy arc-sprayed coatings, reaching the erosion rate of 0.65 mg/h. An important consideration in this theme is that all of the experiments were better than the base metal reference, CA6NM, which had an erosion rate of 6.7 mg/h [34].…”

Section: Defects and Repairing Of Runnersmentioning

confidence: 99%

“…Using the same PTA pulsed arc process, but with pulsed current 180/80 A and peak/base time 0.1/0.1 s, Pukasiewicz et al [34] remelted FeMnCrSi [33] alloy arc-sprayed coatings, reaching the erosion rate of 0.65 mg/h. An important consideration in this theme is that all of the experiments were better than the base metal reference, CA6NM, which had an erosion rate of 6.7 mg/h [34].…”

Section: Defects and Repairing Of Runnersmentioning

confidence: 99%

“…The runners manufactured in CA6NM are heat-treated for solubilization and tempering, in order to obtain a refinement of microstructure, reducing the amount of retained austenite, and stress relief [10,24,34,40]. Although, the welding repairs normally are not exposed to this post-treatment, mainly because of the difficulties to remove a big runner to a furnace or control the temperatures to do this in situ.…”

Section: Stainless Steel Runner Crack Uhegpsmentioning

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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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: Defects and Repairing Of Runnersmentioning

confidence: 99%

Section: Defects and Repairing Of Runnersmentioning

confidence: 99%

Section: Stainless Steel Runner Crack Uhegpsmentioning

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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“…Однако наличие пор и слоистой структуры металлизационных покрытий приводит к снижению их износостойкости [3,4], а достаточно низкая адгезия покрытия (20-35 МПа) в условиях эксплуатации может привести к отслоению. С целью улучшения характеристик напыленных покрытий их подвергают последующему оплавлению концентрированными источниками нагрева [5][6][7][8][9]. По параметрам стоимости, мобильности и универсальности оборудования наиболее перспективным источником является сжатая (плазменная) дуга [10].…”

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WEAR RESISTANCE OF ARC SPRAYED COATINGS TYPE OF Fe-C-Cr-Ti-Al AFTER PLASMA REMELTING

2016

PNIPU

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Для защиты узлов и деталей машин оборудования от различных видов изнашивания применяют технологии поверхностной обработки, предназначенные для повышения их служебных характеристик. Для защиты от абразивного износа широко используются напыленные покрытия системы Fe-C-Cr-Ti-Al, однако их ламеллярно-пористая структура приводит к снижению износостойкости, что сужает область их применения. С целью повышения эксплуатационных характеристик покрытий используются различные методы их последующей обработки. В данной работе рассмотрено влияние плазменного оплавления на износостойкость напыленных покрытий из экономнолегированных порошковых проволок системы Fe-C-Cr-Ti-Al в условиях взаимодействия с абразивом. Для нанесения покрытий использовали аппарат активированной дуговой металлизации АДМ-10. Оплавление напыленных покрытий производили на универсальной установке для плазменной обработки материалов, разработанной на кафедре «Сварочное производство и технология конструкционных материалов» Пермского национального исследовательского политехнического университета. Обработку осуществляли на токе прямой полярности с использованием аргона в качестве защитного и плазмообразующего газа. Наплавку порошковой проволоки производили неплавящимся электродом в среде аргона. Представлены результаты исследований износостойкости, структуры и химического состава напыленных покрытий до и после плазменного оплавления, а также наплавленного металла из представленных порошковых проволок. Установлено, что в процессе плазменного оплавления, за счет интенсивных раскислительных процессов, произошло значительное изменение химического состава покрытия, что способствовало формированию твердой и трещиностойкой структуры среднеуглеродистого мартенсита. Результаты испытаний по закрепленному абразиву показали повышение износостойкости покрытий после плазменного оплавления в 2,5 раза, что в два раза выше, чем у наплавленного металла. Ключевые слова: металлизационное покрытие, порошковая проволока, плазменное оплавление, наплавка, структура, износостойкость, химический состав, микротвердость, сжатая дуга, активированная дуговая металлизация, мартенсит.

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Influence of Plasma Remelting on the Microstructure and Cavitation Resistance of Arc-Sprayed Fe-Mn-Cr-Si Alloy

Cited by 16 publications

References 16 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

WEAR RESISTANCE OF ARC SPRAYED COATINGS TYPE OF Fe-C-Cr-Ti-Al AFTER PLASMA REMELTING

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