Effect of vacuum heat treatment on microstructure and mechanical properties of HVOF sprayed AlCoCrFeNiCu high-entropy alloy coating

Zhou, Yong-kuan; Kang, Jiqiang; Zhang, Jie; Fu, Zhiqiang; Zhu, Lina

doi:10.1016/j.matlet.2022.132551

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…Varis et al [11] studied the wear behavior of the heat-treated HVOF sprayed coating and found significant improvement in wear resistance after heat treatment. Similarly, Zhou et al [12] reported that the furnace heat-treated HEA coating exhibited superior mechanical properties. Furthermore, several authors studied the metallurgical and microstructural changes after heat treatment [13,14].…”

Section: Introductionmentioning

confidence: 86%

Effect of Heat Treatment on Mechanical Properties and Corrosion Response of HVOF Sprayed High Entropy Alloy Coatings

Abhijith,

Kumar,

Rawat

2024

KEM

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Surface and sub-surface related degradation of steels can be minimized using suitable surface coatings. High entropy alloys (HEA) are prominent and emerging materials among many coating materials. The current study investigates the effect of heat treatment of HEA coating on mechanical, metallurgical, and corrosion properties. The HEA coatings on SS304 steel were deposited using a High-Velocity Oxy-Fuel (HVOF) thermal spray process. The developed coatings were furnace heat treated at 700 °C, 900 °C, and 1100 °C, respectively, and their performance was benchmarked with the as-sprayed coatings. The metallurgical, mechanical, and microstructural analyses were performed using X-ray diffraction (XRD), Nanoindentation, Scratch test, and Field Emission Scanning Electron Microscope (FESEM) techniques. The corrosion response of the as sprayed and heat-treated coatings were recorded using a Potentiostat. The results indicated that as-sprayed coatings consisted of a single-phase BCC solid solution; however, the single-phase changed to a dual dual-phase system after heat treatment (BCC+FCC). The 900 °C heat-treated HEA coating exhibited superior mechanical and corrosion properties. But those characteristics started diminishing when the heat treatment temperature exceeded 900 °C. The introduction of the new FCC phase softened the coating, thereby leading to the evolution of microcracks in the coating. These micro-cracks acted as channels for electrolyte diffusion and further corroded the coatings. The current study surmised that HVOF-sprayed HEA coating should not be heat treated at above 900 °C.

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Section: Introductionmentioning

confidence: 86%

Effect of Heat Treatment on Mechanical Properties and Corrosion Response of HVOF Sprayed High Entropy Alloy Coatings

Abhijith,

Kumar,

Rawat

2024

KEM

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“…GB wetting by the second solid phase can have a strong influence on the properties of materials, including Al alloys [18,20,22,23,[25][26][27][28][29][30][31][32][33][34][35], Fe-based alloys and steels [36,, Co-and Ni-based alloys [78][79][80][81][82][83][84][85], Cu alloys [86,88,90], Ti-and Zr-based alloys [91,93,95,97,, Mg alloys [124,126,[128][129][130][131], as well multicomponent and high-entropy alloys [132,134,[136][137][138][139][140][141][142][143][144].…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

“…GB wetting by the intermetallic Mg-RE phases was also observed in M 4Zn [126], Mg-5Sn-2Zn-0.5Zr (wt%) [128], Mg-2Dy-0.5Zn (wt%) [129], Mg-14L alloys [130] and AZ31/ZK60 bimetal rods [131]. GB wetting by a second solid phase was observed in multicomponent highalloys (HEA) such as in arc-melted CoFeNi0.5AlCrx (x = 0.25, 0.50, 0.75 and 1.00) all treated at 1200 °C [84], CoCrFeNi(SiC)x alloy deposited powder plasma arc additiv ufacturing [132], in Al0.2MoNbTaTiW/MC refractory HEA composite manufactu spark plasma sintering and hot extrusion [134], carbon-alloyed FeMnCr-NiCo0.95C subjected to different thermal-mechanical treatments [136], AlCoCrFeNiTi-C H GB wetting by a second solid phase was observed in multicomponent high-entropy alloys (HEA) such as in arc-melted CoFeNi 0.5 AlCr x (x = 0.25, 0.50, 0.75 and 1.00) alloy heat treated at 1200 • C [84], CoCrFeNi(SiC) x alloy deposited powder plasma arc additive manufacturing [132], in Al 0.2 MoNbTaTiW/MC refractory HEA composite manufactured by spark plasma sintering and hot extrusion [134], carbon-alloyed FeMnCr-NiCo 0.95 C 0.05 HEA subjected to different thermal-mechanical treatments [136], AlCoCrFeNiTi-C HEA annealed at 1200 • C [138], NiCoCrAlY coating on 304 stainless steel laser processed at 950 • C [139], spark plasma sintered (SPS) HfNbTaTiZr HEA [140], AlCoCrCuFeNi HEA heat treated at 1200 • C [141], AlCoCrFeNiCu HEA coating deposited by the high velocity oxygen fuel spraying (HVOF) and vacuum heat treatment (VHT) at different temperatures (500, 700, 900 and 1100 • C) [142], AlNb 2 TiV low-weight refractory HEA [143] ans Al 10 Co 19 Cr 16 Fe 20 Ni 35 HEA homogenized at 1200 • C and annealed at 800 • C and at 590 • C [144].…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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Grain boundaries (GBs) can be wetted by a second phase. This phase can be not only liquid (or melted), but it can also be solid. GB wetting can be incomplete (partial) or complete. In the case of incomplete (partial) wetting, the liquid forms in the GB droplets, and the second solid phase forms a chain of (usually lenticular) precipitates. Droplets or precipitates have a non-zero contact angle with the GB. In the case of complete GB wetting, the second phase (liquid or solid) forms in the GB continuous layers between matrix grains. These GB layers completely separate the matrix crystallites from each other. GB wetting by a second solid phase has some important differences from GB wetting by the melt phase. In the latter case, the contact angle always decreases with increasing temperature. If the wetting phase is solid, the contact angle can also increase with increasing temperature. Moreover, the transition from partial to complete wetting can be followed by the opposite transition from complete to partial GB wetting. The GB triple junctions are completely wetted in the broader temperature interval than GBs. Since Phase 2 is also solid, it contains GBs as well. This means that not only can Phase 2 wet the GBs in Phase 1, but the opposite can also occur when Phase 1 can wet the GBs in Phase 2. GB wetting by the second solid phase was observed in the Al-, Mg-, Co-, Ni-, Fe-, Cu-, Zr-, and Ti-based alloys as well as in multicomponent alloys, including high-entropy ones. It can seriously influence various properties of materials.

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“…AlCoCrFeNi coating is a HEA coating that has been studied extensively [8] . Zhou et al prepared the FeCoCrNiAl HEA coating using the supersonic flame spraying technology has good wear resistance, about twice that of 35CrMo steel [9] . The high temperature corrosion resistance of AlCoCrFeNi HEA coating was studied earlier in this study.…”

Section: Introductionmentioning

confidence: 99%

High temperature chlorine corrosion resistance of gradient high entropy alloy coatings prepared by high-velocity-oxygen-fuel spraying

Chu,

Hu,

Dai

2024

J. Phys.: Conf. Ser.

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The effect of different gradient structures on the high temperature chlorine corrosion resistance of gradient high entropy alloy coating was studied to improve the service life of the heating surface of a waste-incinerated boiler. NiCrAl ceramic composite coating (NC), high entropy ceramic composite coating (HC), and gradient high entropy alloy coating (TC) were prepared on 12Cr1MoV substrate by high-velocity-oxygen-fuel spraying. The effects of morphology and microstructure of different coatings on thermal shock resistance and high temperature chlorine corrosion resistance were studied. The results indicate that the porosity of NC coating, HC coating, and TC coating decreased in turn. In the thermal shock resistance test from 800°C to room temperature, the average number of thermal shock of TC coating can reach 21. The mass change of TC coating in 650°C high temperature Cl corrosion resistance test is less than 30 mg/cm2 after 50 hours. In summary, the gradient high entropy alloy coating with HEA as the metal bonding phase can improve the density of thermal spraying gradient coating, and enhance the thermal shock resistance and high temperature Cl corrosion resistance of the coating. Based on the comprehensive on-site application results, it can be concluded that the use of high velocity oxygen flame gradient high entropy alloy coating can effectively improve the density, thermal shock resistance, and high temperature Cl corrosion resistance of the thermal spraying gradient coating on the heating surface of the boiler, and has broad application prospects.

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Effect of vacuum heat treatment on microstructure and mechanical properties of HVOF sprayed AlCoCrFeNiCu high-entropy alloy coating

Cited by 11 publications

References 10 publications

Effect of Heat Treatment on Mechanical Properties and Corrosion Response of HVOF Sprayed High Entropy Alloy Coatings

Effect of Heat Treatment on Mechanical Properties and Corrosion Response of HVOF Sprayed High Entropy Alloy Coatings

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

High temperature chlorine corrosion resistance of gradient high entropy alloy coatings prepared by high-velocity-oxygen-fuel spraying

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