Microstructure of Rhenium Doped Ni-Cr Deposits Produced by Laser Cladding

Kołodziejczak, Paweł; Golański, Dariusz; Chmielewski, Tomasz; Chmielewski, Marcin

doi:10.3390/ma14112745

Cited by 21 publications

(15 citation statements)

References 30 publications

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“…At 2700 ÷ 2800 °C and under high stress conditions, the tensile and creep strength of rhenium at high temperature is much higher than that of tungsten (at temperatures up to 1250 °C it exceeds twice). The addition of rhenium to the Ni-Cr powder is to increase the thermal resistance of the obtained coating and to improve the resistance to high-temperature oxidation [5]. The use of the Al2O3 additive was to increase the oxidation resistance of the coating, but also to increase the wear resistance [6] e.g.…”

Section: Figure 1 Hvof Thermal Spraying Processmentioning

confidence: 99%

microstructural investigation and selected properties of Ni-cr-re-al2o3 coatings deposited by means of hvof thermal spraying

Skowrońska

Golański

Chmielewski

et al. 2021

METAL 2021 Conference Proeedings

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Section: Figure 1 Hvof Thermal Spraying Processmentioning

confidence: 99%

microstructural investigation and selected properties of Ni-cr-re-al2o3 coatings deposited by means of hvof thermal spraying

Skowrońska

Golański

Chmielewski

et al. 2021

METAL 2021 Conference Proeedings

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“…As a promising surface modification technology, laser cladding attracted widespread interest and developed rapidly; in this technique, the thick coating with a strong metallurgical bonding with the substrate can be prepared to meet different performance requirements by flexibly adjusting its microstructure and chemical composition [12][13][14]. A large number of studies were performed to improve wear and corrosion resistance by fabricating ceramic particle-reinforced metal-based coatings using laser cladding on Ti6Al4V (Ti-based coatings reinforced by TiB 2 /TiB [15], TiB [16], TiC [17], TiC/TiB 2 [18], TiC/Ti 2 Ni [19], and SiC [20]; Co-based coatings reinforced by CeO 2 [21], WC [22], TiN [23], and Ti 5 Si 3 /TiC [24]; and Ni-based coatings reinforced by TiC/TiN [25], TiB 2 /TiC [26], WS 2 /hBN [27], and TiN/Ni 3 Ti/Ti 3 AlN [28]).…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate

2022

Metals

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CoCrFeNiAlx (x = 0 and 1.0) high-entropy alloy coatings were synthesized on Ti6Al4V via laser cladding to improve their corrosion and wear resistance under corrosive conditions. Results indicated that the coating (CoCrFeNi) was largely composed of irregular primary α(Ti) and honeycomb-like eutectics of α(Ti) + Ti2Ni as the matrix, with TiC dendrites as the reinforcement. When Al was introduced into the cladding material, irregular α(Ti) grains were transformed into equiaxed grains, besides which the area fraction in eutectics was considerably reduced, and TiC dendrites were also transformed into spherical particles. Compared with the coating without Al, the introduction of Al contributed to the improvement in corrosion resistance because corrosion potential was enhanced from −0.524 V to −0.393 V, whereas corrosion current density and steady current density were reduced from 2.249 × 10−7 A·cm−2 and 1.021 × 10−6 A·cm−2 to 1.260 × 10−7 A·cm−2 and 2.506 × 10−7 A·cm−2, respectively. The substrate was still at the break-in stage during a long-term sliding of 10 h because its wear rate exhibited an approximately linear reduction tendency (2.09 × 10−3 mm3·N−1·m−1 for 2 h and 7.44 × 10−4 mm3·N−1·m−1 for 10 h). With respect to the coatings, they transitioned from the break-in stage into the stable wear stage when the sliding duration exceeded 4 h, during which a comparatively stable wear rate of 2.88 × 10−4 mm3·N−1·m−1 was obtained. The wear mechanism of the substrate was identified as slight microcutting and serious oxidation for the long-term sliding of 10 h. It changed into a combination of slight microcutting, serious oxidation, and moderate brittle debonding for the coatings. Generally speaking, the introduction of Al can refine the microstructure and improve the microstructural uniformity. Moreover, the passive film can be formed more rapidly on the coating surface and presents higher stability when introducing Al. Finally, the introduction of Al also promotes the coating to enter into the stable wear stage more rapidly and causes the decrease in friction coefficient and wear rate.

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“…Nickel-based superalloys are the most widely used metallic materials as hot parts of gas turbine [1,2]. The GH3536 superalloy (Hastalloy X) is a typical solid-solutionstrengthened nickel-based superalloy with high oxidation and corrosion resistances as well as superior mechanical properties at high temperature [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Qing

Zhang

et al. 2022

Metals

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Heat treatment (HT) is an important approach to tune the structure and mechanical properties of as-printed or hot-isostatic-pressed (HIPed) additive manufacturing materials. Due to the carbide precipitates extensively existing after HT with air cooling, this paper studies the microstructure and mechanical behavior of laser powder-bed-fused (L-PBFed) GH3536 superalloy with laminar carbide precipitates at grain boundaries. By comparing with air-cooling samples and water-quenched samples, the results revealed that air cooling often introduced precipitates at grain boundaries, which impede the plastic deformation and are prone to lead to severe transgranular cracks on the fracture surface, contributing to a higher strain-hardening rate but lower ductility of HTed sample. Water quench can largely eliminate the grain-boundary precipitates, contributing to an optimized ductility even with smaller grain size. This work provides more details on the precipitate-deformation relation after HT.

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Microstructure of Rhenium Doped Ni-Cr Deposits Produced by Laser Cladding

Cited by 21 publications

References 30 publications

microstructural investigation and selected properties of Ni-cr-re-al2o3 coatings deposited by means of hvof thermal spraying

microstructural investigation and selected properties of Ni-cr-re-al2o3 coatings deposited by means of hvof thermal spraying

Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate

Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

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