Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Graf, Karin; Tetzlaff, Ulrich; Souza, Gelson Biscaia de; Scheid, Adriano

doi:10.1590/1980-5373-mr-2018-0502

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…Some authors observed a significant increase in the mechanical properties of the coatings (e.g. hardness and wear resistance) when a carbide former-containing alloy is deposited on a high-carbon content substrate [3][4][5] . Otherwise, high dilution processing on low carbon substrates usually induces a drop in mechanical properties 3,6,7 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

et al. 2020

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Laser power influences the range of dilution with the substrate and thus, the microstructure and properties of the coatings. This work evaluated the effect of laser power on the dilution, microstructure, hardness and wear behavior of Hastelloy C276 TM alloy coatings deposited on AISI 304L stainless steel and GGG40 ductile iron. The microstructure was comprised of γ (Ni-FCC) dendrites and molybdenum-rich interdendritic regions containing carbides. The coatings showed similar second phase nature and fraction and equivalent hardness and wear behavior for the lowest laser power condition. Otherwise, higher power on 304L induced to a lower fraction of blocky-like M 23 C 6 /MC carbides; whilst on GGG40 led to a higher fraction of a predominantly lamellar M 6 C type carbide. Largely diluted coatings on ductile iron entailed differences in the strengthening mechanisms which led to higher hardness and lower wear rate. Moreover, wear tracks showed surface oxidation which in turn negatively influenced the performance of specimens with low dilution on both substrates. On the other way, with high dilution, this feature was only observed on stainless steel.

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Section: Introductionmentioning

confidence: 99%

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

et al. 2020

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“…A solution for extending the lifespan of components which operate in corrosive environments with high-wear loads could be protective resistant coatings on high-temperature resistant stainless steels and superalloys. Usually, stainless steels are coated with superalloys for greater strength [2,[4][5][6]. Depositing coatings is a smarter and less expensive way of meeting the industrial design requirements for such materials [6].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, stainless steels are coated with superalloys for greater strength [2,[4][5][6]. Depositing coatings is a smarter and less expensive way of meeting the industrial design requirements for such materials [6].…”

Section: Introductionmentioning

confidence: 99%

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

Uţu

Hulka

Kazamer³

et al. 2022

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Tape brazing constitutes a cost-effective alternative surface protection technology for complex-shaped surfaces. The study explores the characteristics of high-temperature brazed coatings using a cobalt-based powder deposited on a stainless-steel substrate in order to protect parts subjected to hot temperatures in a wear-exposed environment. Microstructural imaging corroborated with x-ray diffraction analysis showed a complex phased structure consisting of intermetallic Cr-Ni, C-Co-W Laves type, and chromium carbide phases. The surface properties of the coatings, targeting hot corrosion behavior, erosion, wear resistance, and microhardness, were evaluated. The high-temperature corrosion test was performed for 100 h at 750 °C in a salt mixture consisting of 25 wt.% NaCl + 75 wt.% Na2SO4. The degree of corrosion attack was closely connected with the exposure temperature, and the degradation of the material corresponding to the mechanisms of low-temperature hot corrosion. The erosion tests were carried out using alumina particles at a 90° impingement angle. The results, correlated with the microhardness measurements, have shown that Co-based coatings exhibited approximately 40% lower material loss compared to that of the steel substrate.

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“…Otherwise, the deposition onto high-carbon substrates may lead to a significant increase in the coatings wear resistance 13,14 . Therefore, some works revealed the possibility of coating design by cladding with substrate material selection and dilution control [12][13][14][15][16][17][18] while many others indicated, as a research opportunity, the processing of composite coatings by laser cladding [2][3][4][5][6][7][8][9][10] . The latter involves an even more intricate task because of the need to select and manage the clad alloy, reinforcement particle type, and its amount, substrate, and laser processing parameters 19,20 .…”

Section: Introductionmentioning

confidence: 99%

“…Figure16. Interdendritic carbides formed in the coatings deposited with 3.0 kW laser power and 30% NbC feeding rate.…”

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confidence: 99%

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

et al. 2021

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This work aims to evaluate the influence of laser power and reinforcement feeding rate on the microstructure, hardness, and wear behavior of NbC-reinforced Hastelloy C276 TM alloy composite coatings. From a dual feeding system, one-step metal-matrix composite coatings were deposited with 10, 30, and 50% mass feeding of NbC powder with laser powers of 1.5 and 3.0 kW. Coatings deposited with 1.5 kW and 30% NbC showed some degree of porosity due to a combination of NbC feeding rate and melting pool temperature. Laser power and NbC feeding rate altered the melting efficiency and substrate burn-in shape, remarkably influencing the dilution. The composite microstructure was comprised of Ni-γ (FCC) dendrites with interdendritic network carbide which, in turn, ranged from lamellar-like M 6 C to blocky-like conjugated MC-M 23 C 6 carbide. Primary petaloid-like MC [Nb] carbide was formed from a 30% reinforcement rate on, whilst a considerable number of unmelted particles was observed for 50%. The higher the reinforcement feeding rate, the higher the carbide fraction and better wear performance of low heat-input specimens. Synthesis with high heat-input sheds a light on the deleterious effect of the dilution and is not an option to enhance the wear performance.

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Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Cited by 9 publications

References 27 publications

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

Effect of Laser Power and Substrate on the Hastelloy C276TM Coatings Features Deposited by Laser Cladding

Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

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