The powder's thermal behavior on the surface of the melting pool during PTA powder surfacing

Wang, Xibao; Li, Chunguo; Xiao-min, Peng; Libo, Shi; Zhang, Hong

doi:10.1016/j.surfcoat.2006.05.009

Cited by 18 publications

(8 citation statements)

References 6 publications

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“…For PTA, the complex powder thermal behavior involved in the process needs to be addressed to analyze the results here presented. The heat power from the melting pool is much greater than that from the arc [20]. Following a similar analysis, we suggest that the total welding energy (TE) can be divided in:…”

Section: Resultsmentioning

confidence: 80%

Corrosion resistance of plasma transferred arc (PTA) Inconel 625 deposits

Garcia¹,

Luz²,

Canobre³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Although the industrial sector is very restrictive in terms of the amount of dilution of the substrate allowed in welded Inconel coatings (often below 10%), the real impact of small changes in dilution on corrosion resistance of Inconel deposits is not clear yet. To evaluate this, welding current, welding speed and powder feed rate were varied within narrow ranges during PTA deposition of Inconel 625 onto carbon steel substrates. The effects of welding parameters on dilution and convexity index of the beads were analyzed within the established operational envelope. Potentiodynamic corrosion tests were carried out using solutions with different corrosion aggressiveness for specimens with different dilutions. The current of 180 A appeared as a transient point for the effects of the welding current on dilution and convexity index, suggesting a complex interaction between welding current, welding speed and powder feed rate. XRD results showed that for the specimens with higher dilution, only the region very close to the interface with the substrate was affected, suppressing the formation of the M2C. Interdendritic corrosion with preferential dissolution of some phases was observed as the main corrosion mechanism for all the deposits. The specimens with higher dilution showed tendency for secondary passivation in NaCl and NaCl + FeCl3 solutions. Moreover, the corrosion potential and corrosion current density values obtained for the specimens with lower and higher dilution were very close, with negligible differences, regardless of the position in the bead. The presence of FeCl3 in the electrolyte shifted the corrosion potential to more positive values. In the NaCl + H2SO4 solution, the deposits showed significant differences only in terms of passivation current between higher and lower dilution specimens. However, in general the differences between the deposits were negligible, showing good overall aqueous corrosion resistance in a wide range of highly aggressive environments. Therefore, this work found a relatively wide operational envelope for Inconel 625 PTA deposits, showing that small changes in deposition conditions, and thus in dilution, do not affect the coating applicability.

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Section: Resultsmentioning

confidence: 80%

Corrosion resistance of plasma transferred arc (PTA) Inconel 625 deposits

Garcia¹,

Luz²,

Canobre³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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“…Uma avaliação teórica do transporte do pó e seu comportamento térmico dentro do arco foi realizada em diferentes trabalhos [2,[6][7][8] [6], Xibao e Wenyue [7], e Xibao et al [10], mas mencionaram que o local de injeção, o estado de turbulência do gás e a quantidade de movimento vetorial das partículas em relação ao jato plasma influenciam sua aceleração e aquecimento. As colisões das partículas com as paredes do canal de injeção resultam em diferentes velocidades e trajetórias no ponto de injeção, contribuindo para diferentes tempos de permanência no plasma e diferentes evoluções tempo / temperatura ao longo da trajetória [9].…”

Section: Comportamento Térmico E Cinemático Do Póunclassified

“…Segundo a mesma obra, há independência também entre o aquecimento da partícula e as propriedades termofísicas dela, pois a temperatura do plasma é enormemente maior que a [10] e outros concluíram que a maior parcela para fusão completa das partículas vem, de fato, da poça metálica. Pavlenko [2] e empresa do setor de PTA-P [13], citam que a transferência de calor da poça para o pó exerce refrigeração da primeira, contribuindo para menor diluição obtida pelo PTA-P. Ademais, a superfície do pó se transforma numa frente de cristalização, permitindo estrutura anisotrópica e refinada (teoria defendida em [14] e verificada em [1], que comparou arame e pó).…”

Section: Comportamento Térmico E Cinemático Do Póunclassified

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Processo PTA-P - Uma revisão da literatura como base para inovações: parte 2 de 2: comportamento térmico e cinemático do pó, parâmetros e consumíveis do processo

Silva

Dutra

2012

Soldag. insp.

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“…To understand the abovementioned effects when used as the only surfacing agent, microstructure and tribological properties of coating with 4, 6, 8, 10 and 12 per cent weight ratios of B 4 C were investigated. The PTA current was set to 100A to increase particles’ total heat power in a melting pool, according to Xibao et al (2006). To discern phase structure X-Ray Diffractometer (XRD) analysis, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses were conducted.…”

Section: Introductionmentioning

confidence: 99%

Inspection of nickel-based boron carbide PTA coatings on AISI 4140 steel

Çelik

2019

ILT

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Purpose Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel. Design/methodology/approach Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD. Findings The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution. Originality/value In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.

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The powder's thermal behavior on the surface of the melting pool during PTA powder surfacing

Cited by 18 publications

References 6 publications

Corrosion resistance of plasma transferred arc (PTA) Inconel 625 deposits

Corrosion resistance of plasma transferred arc (PTA) Inconel 625 deposits

Processo PTA-P - Uma revisão da literatura como base para inovações: parte 2 de 2: comportamento térmico e cinemático do pó, parâmetros e consumíveis do processo

Inspection of nickel-based boron carbide PTA coatings on AISI 4140 steel

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