Evaluation of processing parameters on PTA hardfacing surfaces

Takano, Edson H.; Queiroz, D.; D'Oliveira, Ana Sofia

doi:10.1080/09507110902843974

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…As temperaturas de preaquecimento variaram de 200 a 280 °C e foram monitoradas utilizando-se um pirômetro digital. Essas faixas de temperatura de preaquecimento e interpasse foram escolhidas com base em recomendações do Cenpes/Petrobras e da literatura para os respectivos aços [15,17]. O equipamento de soldagem utilizado para todos os amanteigamentos, em ambos os processos, foi a fonte do modelo multiprocesso DIGI Plus A7 800, fabricada pela IMC Soldagem, com capacidade de corrente máxima de 800 A. O alimentador de pó foi do tipo tambor dosador.…”

Section: Materiais E Métodosunclassified

Efeito do tratamento térmico de alívio de tensão e do preaquecimento na microestrutura e microdureza da interface entre depósitos de inconel 625 e aços AISI 8630M e AISI 4130

et al. 2021

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RESUMO O objetivo deste trabalho foi avaliar o efeito da aplicação de tratamento térmico de alívio de tensão (TTAT) e das temperaturas de preaquecimento e de interpasse sobre a microestrutura, presença de zonas parcialmente diluídas (ZPD), a microdureza e o gradiente de composição ao longo da interface de depósitos da liga AWS E NiCrMo 3 sobre os aços AISI 8630M e AISI 4130 aplicados por dois processos de soldagem (GMAW e PTA-P). Para isto foram executadas camadas sobrepostas de cordões de solda, utilizando diferentes temperaturas de preaquecimento e de interpasse. Os processos de soldagem utilizados foram os processos MIG e Plasma Pó (PTA-P). Em seguida, as interfaces dos depósitos foram submetidas às análises de composição química via EDS, às análises metalográficas por via ótica e eletrônica e a ensaios de microdureza O aumento da temperatura de preaquecimento e de interpasse resultou em maior refino dos grãos da zona termicamente afetada dos aços (ZTA) do primeiro passe, em um aumento da microdureza na ZTA, e em uma maior migração de Fe do substrato para a camada aplicada. Foi verificada uma menor diversidade e frequência de incidência de ZPD nos depósitos executados pelo processo Plasma Pó, enquanto que nos depósitos executados com o processo MIG foram encontradas ZPD do tipo descontínua, com diferentes morfologias. A aplicação do TTAT resultou em redução significativa nos valores de microdureza em todos os casos.

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Section: Materiais E Métodosunclassified

Efeito do tratamento térmico de alívio de tensão e do preaquecimento na microestrutura e microdureza da interface entre depósitos de inconel 625 e aços AISI 8630M e AISI 4130

et al. 2021

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“…This increase in the dilution percentage as the welding current rises can be attributed to the intensification of the thermal input. According to TAKANO, QUEIROZ, and D'OLIVEIRA [18], the most impactful parameter of this processes is the intensity of the current, that significantly affects the characteristics of the deposit. They state that the greater the intensity of the process current, the higher the wettability and consequently, so the higher the dilution level, resulting in a lower coating hardness.…”

Section: Effect Of the Welding Process Parameters In The Dilution Promentioning

confidence: 99%

“…The process parameters that interfere the most in the bead geometry and coating dilution are current and deposition speed [18,19]. The deposition current has the major influence in the dilution, since small variations in its values cause a considerable increase in the dilution results [1,20].…”

Section: Introductionmentioning

confidence: 99%

“…The deposition current has the major influence in the dilution, since small variations in its values cause a considerable increase in the dilution results [1,20]. According to [22,15,18,20], in their studies in commercial alloys, the welding current has a direct proportionality ratio with the dilution, in this way the dilution increases as a consequence of an increase in current. This is due to the thermal input rise, generated by the increase in welding current [15].…”

Section: Introductionmentioning

confidence: 99%

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Influence of welding parameters on the geometric and microstructural characteristics of Inconel 625 coatings deposited on ASTM A36 Steel by Plasma Transferred Arc

et al. 2020

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This work aims to evaluate the influence of welding parameters, current intensity and deposition speed, on the bead geometry, dilution, morphology and properties of a nickel-based alloy coating. For this, single beads of Inconel 625 alloy were deposited on the substrate of ASTM A36 Steel, by PTA-P process. The samples were sandblasted and polished. The samples were chemically etched by a solution of 92 mL HCl, 3 mL HNO 3 and 5 mL H 2 SO 4 for 5 minutes. The geometry of the beads (reinforcement height, bead width, penetration and contact angle) was measured through the digital stereoscope microscope. The microstructures of the cross sections were evaluated by optical microscopy and scanning electron microscopy (SEM), to identify the possible presence of precipitated phases in the ferrite matrix. The chemical composition of these present phases, as well as the diffused iron content from the substrate for the coating, were measured by EDX. The type of the phases precipitated by x-ray diffraction in the top samples of the coating were also evaluated, in 1.5 mm height of reinforcement. For mechanical property analysis, the microhardness of the coatings was measured by Vickers microhardness test to evaluate their relationship with the iron present in the coatings, which diffused from the substrate. The results confirmed the influence of welding parameters on coating dilution-Current is the parameter of greatest response. The morphologies of the coatings were presented as a γ matrix with second phase precipitation composed of Ni, Nb, Cr and Mo. The concentration of these precipitations decreased with increasing dilution. This occurred because of the increased migration of Fe present in the substrate of the coating through the diffusion phenomena, with increasing dilution. The Fe reduced the solubility of Nb and Mo of the γ matrix, causing the decrease of its hardness.

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“…Directly considering the processes' cost, welding seems to be the most advantageous [4]. A welding process that has been widely investigated corresponds to Plasma Transferred Arc technique (PTA) [5][6][7] since it leads to the deposition of homogeneous and dense coatings, with high degree of reproducibility. It is additionally cost effective and can be found in industry.…”

Section: Introductionmentioning

confidence: 99%

Wear resistant coatings of boron-modified stainless steels deposited by Plasma Transferred Arc

Sigolo

Soyama

Zepon

et al. 2016

Surface and Coatings Technology

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In this research work the microstructure and wear resistance of boron-modified stainless steel coatings were investigated. The coatings were produced by Plasma Transferred Arc (PTA) with powders of supermartensitic and superduplex stainless steel with 1 and 3 wt.% B addition, respectively. The deposition was carried out on AISI 4140 steel substrate. Microstructural characterization revealed dendritic growth in both cases; however, the amount of borides formed was quite different, around 14% for supermartensitic with 1 wt.% B and 32% for superduplex with 3 wt.% B. Thermodynamic calculations were used to predict phase formation and solidification paths resulting in good agreement with the experimental results. The wear resistance was characterized by dry sand/rubber wheel and reciprocating pin-on-plate tests. In dry sand/rubber wheel the volume loss of quenched and tempered AISI 4140 was superior to supermartensitic steel with 1 wt.% B, nonetheless it was comparable to superduplex steel with 3 wt.% B. On the other hand, regarding the pin-on-plate tests, the wear resistance of both boron-modified steels was far superior. The formation of hard borides increased both the hardness and overall wear resistance of boron-modified stainless steels. Additionally, the high boride fraction was responsible for the superior wear performance of superduplex with 3 wt.% B.

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Evaluation of processing parameters on PTA hardfacing surfaces

Cited by 9 publications

References 1 publication

Efeito do tratamento térmico de alívio de tensão e do preaquecimento na microestrutura e microdureza da interface entre depósitos de inconel 625 e aços AISI 8630M e AISI 4130

Efeito do tratamento térmico de alívio de tensão e do preaquecimento na microestrutura e microdureza da interface entre depósitos de inconel 625 e aços AISI 8630M e AISI 4130

Influence of welding parameters on the geometric and microstructural characteristics of Inconel 625 coatings deposited on ASTM A36 Steel by Plasma Transferred Arc

Wear resistant coatings of boron-modified stainless steels deposited by Plasma Transferred Arc

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