Microstructures and mechanical properties in powder-based additive manufacturing of a nickel-based alloy

Luo, Liting; Gong, Xue

doi:10.3103/s1067821217030129

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…A 700 • C class A-USC thermal power unit requires hightemperature materials with good high-temperature creep strength, excellent resistance to steam oxidation on the inner wall of the tube, and excellent processing performance [1]. Inconel 625 has good corrosion resistance and oxidation resistance in high-temperature and high-pressure environments; therefore, it has been considered to be one of the excellent candidate materials for the key components of advanced supercritical boiler superheaters and reheaters [2][3][4][5][6]. However, advanced supercritical oil-fired boilers usually use highsulfur and high-vanadium crude oil as fuel, and the sulfur and vanadium in the fuel will cause a high-temperature corrosion of the boiler [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Behavior of Inconel 625 in Na2SO4 and V2O5 Molten Salt System

Xue

et al. 2023

Metals

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This study aimed to examine the corrosion behavior of Inconel 625 in a molten salt system of sodium sulfate and vanadium pentoxide at varying temperatures and durations. The corrosion products, microstructure, and element distribution of hot extruded Inconel in Na2SO4 and V2O5 molten salt systems were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) analyses. This study demonstrates that corrosion of the alloy increases with time at a constant temperature. During the initial stage of corrosion, the surface of the alloy is primarily composed of a dense oxide layer consisting of Cr2O3 and NiO. However, after exposure to the salt bath for 24 h, a chemical reaction occurs between the alloy and vanadium (V), resulting in the formation of CrVO4 and Ni3V2O8. Furthermore, the intrusion of sulfur (S) element into the matrix leads to the formation of internal sulfides, including Ni-, Cr-, and Mo-based sulfides, which accelerate intergranular and intracrystalline corrosion. As the corrosion temperature rises, the surface microstructure of the corrosion layer transforms from powder to salt particles and then to massive particles. The corrosion products exhibit a clear stratification, while the alloy undergoes simultaneous oxidation and vulcanization processes.

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