Friction and wear characterization of some cobalt- and iron-based superalloys in zinc alloy baths

Zhang, K; Battiston, Louis

doi:10.1016/s0043-1648(01)00889-4

Cited by 31 publications

(17 citation statements)

References 6 publications

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“…They operate in hostile environment involving the effects of abrasive wear, molten metal attack and temperature. Galvanizers have been worked in order to extend the service life of pot hardware, in particular bearings, reducing line stops and improving the quality of galvanized products [1][2][3][4][5] . The continuous search for materials that can withstand such harsh demands led to the use of Laves phase reinforced Co-based alloys, the CoCrMoSi alloy system.…”

Section: Introductionmentioning

confidence: 99%

Effect of processing on microstructure and properties of CoCrMoSi alloy

Scheid

D'Oliveira

2013

Mat. Res.

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CoCrMoSi alloys microstructure is affected by processing and their properties have been associated with the high volume fraction of Laves phase. However, not much has been reported on the effect of structure refinement and morphology on the properties of these alloys. This paper evaluates a CoCrMoSi alloy processed by centrifugal casting and Plasma Transferred Arc (PTA) hardfacing, aiming to understand the correlation between microstructure and properties at room temperature in the as-processed condition and following exposure at 600 °C. Characterization was carried out using scanning electron microscopy, X-ray diffraction, hardness and wear tests. The cooling rates associated with each of the processing techniques used account for the developed microstructures and associated hardness, a 626 HV 0,5 cast alloy and 649 HV 0,5 deposited alloy, the former exhibiting a coarser microstructure. Wear behavior was determined by the dispersion of solid solution areas in the microstructure and as a consequence temperature exposure aggravated the poorer wear resistance of the cast alloy. The finer phase dispersion formed in coatings overlapped the deleterious effects of dilution and account for the stable wear behavior after temperature exposure.

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Section: Introductionmentioning

confidence: 99%

Effect of processing on microstructure and properties of CoCrMoSi alloy

Scheid

D'Oliveira

2013

Mat. Res.

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“…[6] Test conditions are listed in Table II. As can be seen, tests were conducted in zinc baths with or without additions of aluminum and iron.…”

Section: B Bearing Testsmentioning

confidence: 99%

“…A detailed description of the test procedure can be found in a previous publication. [6] Experiments were conducted for 180 minutes, including a 10-minute stay at each load step and 120 minutes at full load. To assess changes to the surface conditions as a result of material reactions with the zinc baths during the temperaturestabilizing period, static dip samples of STELLITE 6 were prepared and immersed in the zinc baths with the submersion of the bearing assembly.…”

Section: B Bearing Testsmentioning

confidence: 99%

“…The wear of bearings made of cobalt-based superalloys when coupled with similar materials is typically characterized by wide and deep grooves on the worn surfaces following service in continuous galvanizing. A previous investigation [6] of the friction and wear characteristics of the cobalt-based superalloys in a zinc bath (0.12 wt. pct Al and 0.03 wt.…”

Section: Introductionmentioning

confidence: 99%

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On the wear of a cobalt-based superalloy in zinc baths

Zhang

Tang

2003

Metall Mater Trans A

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Journal bearings made of a cobalt-based superalloy, trademarked STELLITE 6, were evaluated in zinc baths with and without the presence of aluminum and iron. The sleeve and the bushing wore evenly when tested in a pure zinc bath. The surfaces were generally smooth and covered by some rather fine grooves after the test. The wear of the bearings was much more severe when tested in aluminum-containing zinc baths. The worn surfaces of the bearings were fully covered by wide and deep grooves. The coefficient of friction of the superalloy generally increased with increases in the aluminum content of the molten zinc. The iron addition to the molten zinc appeared to affect the friction and wear characteristics of the superalloy. Detailed metallographic and microchemical analyses were performed to elucidate the wear mechanisms. The superalloy was found to react readily with the molten zinc alloys to form intermetallic compounds. In a pure zinc bath, zinc-based intermetallic compounds formed on the bearing surfaces; in baths containing aluminum, a compact intermetallic layer, based on the cobalt-aluminide phase, was detected on the bearing surfaces. Evidence collected in this study indicated that wear debris reacted with aluminum in the molten zinc and transformed itself into hard and abrasive cobalt-aluminide particles. During the test, these particles reattached to the bearing surfaces and built up. Acting as blunt microcutters, these particles plowed the bearing surfaces and created deep grooves. The dominant wear mechanism in the aluminum-containing zinc baths was identified as abrasion; fatigue and corrosive wear, however, served as precursors of the dominant wear mechanism.

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“…Similarly, bushings and sleeve pipes are also subjected to high temperature, corrosion and abrasion. As a result, they generally have a very low in-service life, with its current working lifetime being approximately 15 days [5,6].…”

Section: Introductionmentioning

confidence: 99%

Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications

Zhang

et al. 2017

Coatings

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This paper describes thermal spray techniques for making hard coatings on bushing and sleeve component surfaces. Specifically, plasma-arc welding was used to produce 5-mm thick Co-Cr alloy welding overlays on the bushing, while a high-velocity oxy-fuel spraying technique and laser re-melting technique were used to produce thinner coatings of Co-Cr-Ni+WC of about 1 mm thickness on the sleeve-pipe counterparts. The surface-treated components were then submerged in liquid zinc to study the corrosive behaviour of the surface coating and substrate. Both the scanning electron microscope and energy dispersive spectrometer analyses were used to study the microstructure and phase composition of both coatings and substrates prior to and after corrosion experiments. The results show that the microstructure of the bushing consists of γ-cobalt solid solution as well as the eutectic structure of γ-cobalt and carbides, which have good corrosive resistance against molten zinc. Meanwhile, the microstructure of the sleeve pipe consists of a Co-Cr solid solution with various forms of carbides, which displays the combined properties of toughness with good corrosive resistance to molten zinc.

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Friction and wear characterization of some cobalt- and iron-based superalloys in zinc alloy baths

Cited by 31 publications

References 6 publications

Effect of processing on microstructure and properties of CoCrMoSi alloy

Effect of processing on microstructure and properties of CoCrMoSi alloy

On the wear of a cobalt-based superalloy in zinc baths

Thermal-Sprayed Coatings on Bushing and Sleeve-Pipe Surfaces in Continuous Galvanizing Sinking Roller Production Line Applications

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