Hot Corrosion Behavior of Inconel 625 Superalloy in Eutectic Molten Nitrate Salts

Khorsand, S.; Sheikhi, A.; Raeissi, K.; Golozar, M.A.

doi:10.1007/s11085-017-9830-5

Cited by 26 publications

(14 citation statements)

References 32 publications

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“…Corrosion resistance of Ni-based alloys is an important research topic. 3,4 Skamat et al 69 studied Ni-based coatings refused by means of the flame method assisted with vibrations, which increased the corrosion resistance, reduced the coating roughness and promoted the thick boride-free layer.…”

Section: Machining Of Wc and Inconelmentioning

confidence: 99%

“…1 One parameter difficult to manage in machining processes is the roughness of machined surfaces. Roughness is a crucial indicator of the surface quality, which influences the aesthetics, electrical conductivity, lubrication, heat transmission, light reflection, wear resistance, 2 friction, corrosion resistance 3,4 and fatigue life of the surface. [5][6][7] Surface roughness, integrity, and appearance can also affect customer satisfaction, product reliability, and functionality.…”

Section: Introductionmentioning

confidence: 99%

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Surface roughness of machined wood and advanced engineering materials and its prediction: A review

Zhong

2021

Advances in Mechanical Engineering

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This article discusses the surface roughness of wood and advanced engineering materials after machining and its prediction. The topics are surface roughness of precision-machined advanced engineering materials, machining of WC and Inconel, rapidly solidified Al alloys, surface roughness of wood materials, and prediction of surface roughness. Findings include that ductile streaks on silicon and glass surfaces ground or lapped with inexpensive machines largely reduced the polishing time to obtain the required surface roughness. Abrasive jet machining could remove the patterns from recycled wafers and improve the surface roughness. The roughness of WC-Co coatings was significantly improved by using the method of fast regime fluidized bed machining. As beryllium is a toxic element, the rapidly solidified Al alloy may be a good insert material to replace BeCu. Higher bonding strengths resulted from rougher surfaces of wood samples. Wood samples had reduced bonding strengths after soaking in water. Optimum artificial neural networks (ANNs) with necessary inputs could accurately predict the roughness values. ANNs trained using particle swarm optimization and genetic algorithms could predict surface roughness better than typical ANNs. Minimum quantity lubrication is a hot research topic to minimize the amount of the fluid for cost and environmental considerations.

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Section: Machining Of Wc and Inconelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface roughness of machined wood and advanced engineering materials and its prediction: A review

Zhong

2021

Advances in Mechanical Engineering

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“…However, the high-current density and high-voltage EP processes might not be applicable for EP of IN625 in ionic electrolytes. Generally, the ionic electrolytes, particularly in the case of viscous solutions, have limited current densities due to the lower mobility of the charge carriers and hence lower ionic conductivity [28]. Therefore, the high-current density EP is mostly performed using a mixture of concentrated acidic electrolytes [10].…”

Section: Future Workmentioning

confidence: 99%

Electropolishing of Laser Powder Bed-Fused IN625 Components in an Ionic Electrolyte

Mohammadian

Turenne

Braïlovski

2019

JMMP

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This work presents the first practical application of ionic electrolytes for electropolishing of nickel-based superalloys. It contains the results of an experiment-driven optimization of the applied potential and electrolyte temperature during electropolishing of laser powder bed-fused IN625 components containing surfaces oriented to the building platform under angles varying from 0 to 135°. For comparative purposes, the roughness profilometry and confocal microscopy techniques were used to characterize the surface finish topographies and the material removal rates of IN625 components subjected to electropolishing in ionic and acidic (reference) electrolytes. After 4 h of electropolishing in both electrolytes, a roughness of Ra ≤ 6.3 µm (ISO N9 grade number of roughness) was obtained for all the build orientations. To elaborate, both electrolytes manifested identical roughness evolutions with time on the 45°(75% Ra reduction) and 90°-oriented (65% Ra reduction) surfaces. Although the roughness reduction on the 135°-oriented surface in the ionic electrolyte was 17% less than in the acidic electrolyte, the former provided a more uniform roughness profile on the 0°-oriented surface (30% Ra reduction) and 44% higher current efficiency than the acidic electrolyte. This work proves that ionic electrolytes constitute a greener alternative to industrial acidic mixtures for electropolishing of three-dimensional (3D)-printed parts from nickel-based superalloys.

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“…It is customary to improve the corrosion resistance of alloys by composition adjustment or chemical surface treatment. The corrosion resistance of Inconel 625 mainly from the rapid formation of Cr 2 O 3 oxide film by the Cr element in the alloy to hinder the continuation of the corrosion reaction [9,10] . However, considering the cost and environmental protection, it is a better choice to improve the corrosion resistance of the alloy by adjusting the alloy structure without changing the alloy composition.…”

Section: Introductionmentioning

confidence: 99%

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

Wang

Gao

et al. 2021

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The feasibility of applying the grain boundary character distribution (GBCD) optimization to Inconel 625 for improving the intergranular corrosion (IGC) resistance was studied. The GBCD was obtained and characterized by electron backscatter diffraction (EBSD) analysis, and its optimization was mainly attributed to annealing twins (Σ3) and twins related to boundaries formed during thermal-mechanical processing (TMP). Through TMP of 5% cold rolling and subsequent annealing at 1150 ℃ for 5 min, the proportion of low Σ coincidence site lattice (CSL) grain boundaries of the Inconel 625 can be enhanced to about 35.8% which mainly were of Σ3 n (n=1, 2, 3) type. There is an increase of 24.8% compared with the solution-treated sample, and simultaneously the large-size highly-twinned grain-cluster microstructure is formed. The grain-cluster is mainly composed of Σ3-Σ3-Σ9 or Σ3-Σ9-Σ27 triple junctions, which is mainly caused by boundary reactions during grain growth. Among them, the IGC resistance of Σ3 grain boundaries, Σ9 grain boundaries and random grain boundaries is sequentially weakened. With the increase of the low ΣCSL grain boundary fraction, the IGC resistance of Inconel 625 improves. The essential reason is the amount of Σ3 boundaries interrupting the random boundary network increases and the large grain-cluster arrests the penetration of IGC.

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Hot Corrosion Behavior of Inconel 625 Superalloy in Eutectic Molten Nitrate Salts

Cited by 26 publications

References 32 publications

Surface roughness of machined wood and advanced engineering materials and its prediction: A review

Surface roughness of machined wood and advanced engineering materials and its prediction: A review

Electropolishing of Laser Powder Bed-Fused IN625 Components in an Ionic Electrolyte

Improving Intergranular Corrosion Resistance in Inconel 625 via Grain Boundary Character Distribution Optimization

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