Influence of Heat Treatments on Corrosion Behaviour of Alloy 625 Forged Rod

Corrieu, J.M.; Vernot-Loier, C.; Cortial, F.

doi:10.7449/1994/superalloys_1994_795_806

Cited by 2 publications

(2 citation statements)

References 14 publications

(13 reference statements)

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“…Owing Kim and Lee, the formation of carbides can be a factor contributing to the degradation of corrosion resistance of Alloy 625, because intergranular areas of carbides are thermodynamically more unstable and react more readily than other intergranular ones [36]. Cortial et al studied the effect of heat treatment on the corrosion resistance of forged and welded nickel superalloys [37,38]. They concluded that hardening between 650 and 800 °C results in dislocation gliding of matrix, γ″ precipitation and maximum of intergranular precipitation of fine M 23 C 6 carbides.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion

et al. 2019

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The effect of microstructure on the susceptibility to selective corrosion of Alloy 625 produced by laser powder bed fusion (LPBF) process was investigated through intergranular corrosion tests according to ASTM G28 standard. The effect of heat treatment on selective corrosion susceptibility was also evaluated. The behavior was compared to commercial hot-worked, heat treated Grade 1 Alloy 625. The morphology of attack after boiling ferric sulfate-sulfuric acid test according to ASTM G28 standard is less penetrating for LPBF 625 alloy compared to hot-worked and heat-treated alloy both in as-built condition and after heat treatment. The different attack morphology can be ascribed to the oversaturation of the alloying elements in the nickel austenitic matrix obtained due to the very high cooling rate. On as-built specimens, a shallow selective attack of the border of the melt pools was observed, which disappeared after the heat treatment. The results confirmed similar intergranular corrosion susceptibility, but different corrosion morphologies were detected. The results are discussed in relation to the unique microstructures of LPBF manufactured alloys.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion

et al. 2019

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“…Cyclic potentiodynamic were carried out on the Alloy 625 produced via LPBF before and after the annealing heat treatment suggested by the standard (ASTM B446). 39 Since the LPBF technology produces a rough surface, for comparison purposes, two types of surface treatment, namely as built and polished surfaces, were investigated for LPBF specimens. In this way it was also possible to evaluate the protectiveness of the passive film formed during LPBF as well as its modification with the heat treatment.…”

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Evaluation of Corrosion Resistance of Alloy 625 Obtained by Laser Powder Bed Fusion

Cabrini

Lorenzi

Testa

et al. 2019

J. Electrochem. Soc.

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The aim of this work is to compare the corrosion resistance of nickel-base Alloy 625 (UNS N06625) produced by laser powder bed fusion with that obtained via conventional casting and hot working. Cyclic potentiodynamic polarization and potentiostatic tests were performed in order to evaluate the corrosion resistance of the differently manufactured alloys according to ASTM G5, and in NaCl 0.6 M solution at pH 7 and pH 3, at 40°C. The electrochemical characterization was carried out on the as-produced alloy and after annealing at 980°C for 32 minutes (according to ASTM B446). This heat treatment was also performed on the commercial hot worked alloy. Two surface conditions, namely as-built and polished surfaces, were investigated on the additive manufactured specimens. The alloy produced by laser powder bed fusion was not susceptible to pitting in the considered environments and had a good localized corrosion resistance, slightly higher than that of traditional wrought material. However, as predicted, the corrosion resistance of the as-built surfaces increased after mechanical polishing. The correlation between the corrosion performance and microstructure is also discussed.

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Influence of Heat Treatments on Corrosion Behaviour of Alloy 625 Forged Rod

Cited by 2 publications

References 14 publications

Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion

Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion

Evaluation of Corrosion Resistance of Alloy 625 Obtained by Laser Powder Bed Fusion

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