Anderson Geraldo Marenda Pukasiewicz
Federal University of Technology - Paraná
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Soldagem & Inspecao | 2015
Gustavo Bavaresco Sucharski; Anderson Geraldo Marenda Pukasiewicz; Rodolpho Fernando Váz; Ramón Sigifredo Cortés Paredes
HVOF thermal spray process produces coatings with low porosity and low oxide content, as well as high substrate adhesion. Small variations on the parameters of the HVOF process can generate coatings with different characteristics and properties, which also is chemical composition depended of the alloy. FeMnCrSi alloy is a cavitation resistant class of material with a great potential for HVOF deposition use. The main goal of this article is to study the influence of some HVOF parameters deposition, as standoff distance, powder feed rate and carrier gas pressure on three different alloys. FeMnCrSi experimental alloys with some variations in nickel and boron content were studied. Taguchi experimental design with L9 orthogonal array was used in this work. Porosity, oxide content, tensile adhesion strength and microhardness of the coatings were evaluated. The results indicated that all factors have significant influence on these properties. Chemical composition of the alloys was the most important factor, followed by the carrier gas pressure, standoff distance and powder feed rate. The addition of Ni, produces coatings with lower levels of oxide content and porosity. An experiment with improved parameters was conducted, and a great improvement on the coating properties was observed.
Soldagem & Inspecao | 2013
Ruimar Rubens de Gouveia; Anderson Geraldo Marenda Pukasiewicz; André Ricardo Capra; Sérgio Luiz Henke; Paulo Cesar Okimoto
Martensitic stainless steels have been used for hydraulic turbines manufacturing, because its high toughness. However, these steels have some restrictions regarding regions recovered by welding, mainly by non-tempered martensite formation, promoting toughness reduction. Concerning hydraulic turbine repairs, there is a great interest in welding procedures development that promotes a better toughness, without post welding heat treatment (PWHT). The mainly objective of this paper is analyze the influence of interpass temperature on the microstructure, impact toughness and fatigue crack propagation in CA6NM martensitic stainless steel multipass welded joints, with AWS410NiMo filler metal, with GTAW (gas tungsten arc welding). It was observed the interpass temperature influence on ferrite δ formation, observing intergranular ferrite d formation on the d+g field in 80 oC interpass temperature, while the sample welded at 150 oC the formation of ferrite d occurs mainly in the δ monophase field. Ferrite d formation with the lowest temperature interpass promoted an increase in impact toughness and a decrease in the fatigue crack propagation when compared with 150oC interpass temperature sample. It was observed that GTAW process can be an excellent alternative for CA6NM hydraulic turbine repair, it was also observed a significant interpass temperature influence.
Soldagem & Inspecao | 2010
Cristhian Ramos Will; André Ricardo Capra; Anderson Geraldo Marenda Pukasiewicz; Joceli da Guia Chandelier; Ramón Sigifredo Cortés Paredes
A necessidade de diminuicao dos tempos de parada e custos de manutencao de turbinas geradoras de energia eletrica tem motivado o desenvolvimento de novos materiais e processos de recuperacao de areas cavitadas. Atualmente diferentes processos automatizados de soldagem vem sendo estudados, principalmente a soldagem por plasma de arco transferido, PTA (plasma transferred arc), em substituicao a soldagem FCAW (flux cored arc welding). O processo PTA apresenta como principais vantagens a baixa diluicao, estreita zona termicamente afetada, excelente estabilidade de arco e baixo indice de respingos, entretanto, poucas ligas resistentes a cavitacao foram desenvolvidas para este processo. Este trabalho tem por objetivo comparar tres ligas resistentes a cavitacao com Cobalto, depositadas por PTA. A primeira desenvolvida para soldagem FCAW, a segunda desenvolvida para soldagem PTA e uma liga nacional em desenvolvimento do tipo inoxidavel austenitica com cobalto. As amostras foram analisadas atraves de microscopia otica, eletronica de varredura, microdureza Vickers, raios-X e ensaio de cavitacao acelerada, ASTM G-32-95. Os resultados mostraram a formacao de microestruturas austeniticas refinadas nas tres amostras. A liga comercial desenvolvida para soldagem PTA apresentou melhor estabilidade do arco, alem de menor quantidade de defeitos. A liga nacional apresentou bom resultado durante a deposicao, enquanto que a liga FCAW apresentou melhor resultado no ensaio de cavitacao.
Journal of Thermal Spray Technology | 2018
L. L. Silveira; Gustavo Bavaresco Sucharski; Anderson Geraldo Marenda Pukasiewicz; Ramón Sigifredo Cortés Paredes
The cavitation wear process is one of the major wear mechanisms in turbines and rotors of hydroelectric power plants in Brazil. An effective way to increase the cavitation resistance is the use of coatings, applied by thermal spraying. The high-velocity oxy-fuel process (HVOF) is one of the most used thermal spraying processes, and it is widely adopted for applying coatings for protection against wear and in maintenance components. A FeCrMnSiB experimental alloy was deposited onto SAE 1020 substrate by HVOF process, in order to evaluate the influence of the powder particle size range on the morphology and cavitation resistance of the coatings. The morphology of the coatings showed an increase in oxide content with powder size reduction. The increase in the powder particle size reduced the wettability of the particles, observed by the increase in the quantity of non-melted particles. Higher particle size distribution led to an increase in erosion rate, due to higher presence of non-melted particles in the coatings and consequently reduction of splats adhesion. The cavitation damage was perceived mainly by the mechanism of lamellae detachment; however, part of the damage was also absorbed by strain hardening due to the γ-ε martensitic transformation.
Welding International | 2015
Ruimar Rubens de Gouveia; Anderson Geraldo Marenda Pukasiewicz; André Ricardo Capra; Sérgio Luiz Henke; Paulo Cesar Okimoto
Mainly due to their great toughness, martensitic stainless steels are used for manufacturing hydraulic turbines. However, these steels have some restrictions regarding regions recovered by welding, mainly due to the formation of non-quenched martensite, which causes a reduction in toughness. Considering repair of hydraulic turbines, there is a great interest in developing welding procedures that increase impact toughness and avoid post-welding heat treatment (TTPS). This study aims to analyse the influence of interpass temperature on microstructure, impact toughness and fatigue crack propagation in multipass welded joints on martensitic stainless steel CA6NM, using AWS410NiMo filler metal and the gas tungsten arc welding (GTAW) process. In the sample with interpass temperature of 80°C, influence of the interpass temperature on the formation of ferrite δ, with intragranular formation in the two-phase δ field, was observed, while in the sample welded at 150°C, the formation of ferrite δδ occurred mainly in the single-phase field. The change in the formation of ferrite δ, with the low interpass temperature, promoted an increase in impact toughness and a decrease in the fatigue crack propagation when compared with the sample welded with a higher interpass temperature. The results obtained indicate that the TIG process is an excellent alternative for the repair of CA6NM steel, with a significant influence from the interpass temperature.
Welding International | 2012
Cristhian Ramos Will; André Ricardo Capra; Anderson Geraldo Marenda Pukasiewicz; Joceli da Guia Chandelier; Ramón Sigifredo Cortés Paredes
The necessity to reduce time and maintenance costs in electrical energy generation turbines promotes the development of new materials and processes to recover cavitated areas. Nowadays, different automated welding process have been studied, mainly plasma-transferred arc welding (PTA) in substitution of fluxed core arc welding (FCAW). The PTA process presents as its main advantages: low dilution, a narrow heat-affected zone and excellent arc stability; however, few cavitation resistant alloys are developed for this process. This paper aims to compare three cobalt cavitation resistant alloys deposited with the PTA process. The first alloy is a cobalt stainless steel alloy developed for the FCAW process, the second is a cobalt stainless steel alloy developed for the PTA process and the third is a national developed stainless steel alloy with cobalt. The samples were analysed by optical and electronic microscopy, microhardness and accelerated cavitation testing, ASTM G32-95. Results show that a refined austenitic microstructure was observed in all samples. The commercial alloys, developed for PTA welding, presented a better arc stability and lower quantity of defects. The national alloy demonstrated good results during deposition while the FCAW alloy presented better cavitation resistance.
Wear | 2018
Murilo Sérgio Lamana; Anderson Geraldo Marenda Pukasiewicz; Sanjay Sampath
Soldagem & Inspecao | 2012
Anderson Geraldo Marenda Pukasiewicz; Fernando Ratti de Oliveira; André Ricardo Capra; Ramón Sigifredo Cortés Paredes
Procceedings of the 24th ABCM International Congress of Mechanical Engineering | 2017
Anderson Geraldo Marenda Pukasiewicz; Murilo Sérgio Lamana
13th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials | 2014
Luciana Leite Silveira; Anderson Geraldo Marenda Pukasiewicz