Decrease in hydrogen embrittlement sensitivity of INCONEL 718 by laser surface softening

Hirose, Akio; Arita, Yoshihiro; Nakanishi, Yoshinobu; Kobayashi, Kojiro F.

doi:10.1016/s0921-5093(96)10384-1

Cited by 23 publications

(5 citation statements)

References 5 publications

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“…d) on the HE susceptibility of this alloy. Hirose et al reported that HE sensitivity was significantly decreased by dissolving the g 00 /g 0 particles distributed in the thin surface layer of conventionally aged Inconel 718 by a laser surface annealing (LSA) process [11,12]. Since HE fractures generally start from the surface layer, Hirose's findings suggest that the g 00 /g 0 phases greatly increases HE sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Effects of precipitation phases on the hydrogen embrittlement sensitivity of Inconel 718

Liu¹,

Tanaka

Hirose

et al. 2002

Science and Technology of Advanced Materials

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Section: Introductionmentioning

confidence: 99%

Effects of precipitation phases on the hydrogen embrittlement sensitivity of Inconel 718

Liu¹,

Tanaka

Hirose

et al. 2002

Science and Technology of Advanced Materials

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“…TEM images of γ'' and γ' can be seem in many references like Ref. [11]. Hardness values (load 50g) are shown in table 2 and demonstrate that at 1073 K for 20 h there was in fact an overaging that resulted in hardness loss, because of the growth of δ phase which held grain boundary.…”

Section: Resultsmentioning

confidence: 87%

Effects of the Microstructure on the Hydrogen Diffusivity in Ni-Based Superalloy 718

Rosa¹,

Ribeiro²,

Almeida³

et al. 2010

DDF

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In some applications involving aggressive environments, common in oil and gas industries, superalloys 718 may suffer hydrogen embrittlement, resulting in degradation of mechanical properties. The aim of this work is to study the interaction of hydrogen with different microstructures in a 1 mm thick plate, annealed and age hardened superalloy 718. In this way, the effects of hydrogen interaction on microstructure were studied via thermal programmed desorption (TPD), tensile tests and scanning electron microscopy (SEM). Samples were studied in as-received, artificially aged and overaged conditions. Hydrogenated samples submitted to tensile tests presented ductility loss when compared to hydrogen free samples, showing the hydrogen embrittlement sensitivity of this alloy. The influence of  phase precipitation on hydrogen diffusivity, as a result of aging treatment, was also discussed in this work.

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“…Hirose et al [14] reported that laser surface softening leads to almost twice the higher ductility of the surface in comparison to the base materials. Heat treatment was used by Demetriou et al [15] to decrease the hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeation, and Mechanical and Tribological Behavior, of CrNx Coatings Deposited at Various Bias Voltages on IN718 by Direct Current Reactive Sputtering

et al. 2018

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In the current work, the microstructure, hydrogen permeability, and properties of chromium nitride (CrN x ) thin films deposited on the Inconel 718 superalloy using direct current reactive sputtering are investigated. The influence of the substrate bias voltage on the crystal structure, mechanical, and tribological properties before and after hydrogen exposure was studied. It was found that increasing the substrate bias voltage leads to densification of the coating. X-ray diffraction (XRD) results reveal a change from mixed fcc-CrN + hcp-Cr 2 N to the approximately stoichiometric hcp-Cr 2 N phase with increasing substrate bias confirmed by wavelength-dispersive X-ray spectroscopy (WDS). The texture coefficients of (113), (110), and (111) planes vary significantly with increasing substrate bias voltage. The hydrogen permeability was measured by gas-phase hydrogenation. The CrN coating deposited at 60 V with mixed c-CrN and (113) textured hcp-Cr 2 N phases exhibits the lowest hydrogen absorption at 873 K. It is suggested that the crystal orientation is only one parameter influencing the permeation resistance of the CrN x coating together with the film structure, the presence of mixing phases, and the packing density of the structure. After hydrogenation, the hardness increased for all coatings, which could be related to the formation of a Cr 2 O 3 oxide film on the surface, as well as the defect formation after hydrogen loading. Tribological tests reveal that hydrogenation leads to a decrease of the friction coefficient by up to 40%. The lowest value of 0.25 ± 0.02 was reached for the CrN x coating deposited at 60 V after hydrogenation.

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Decrease in hydrogen embrittlement sensitivity of INCONEL 718 by laser surface softening

Cited by 23 publications

References 5 publications

Effects of precipitation phases on the hydrogen embrittlement sensitivity of Inconel 718

Effects of precipitation phases on the hydrogen embrittlement sensitivity of Inconel 718

Effects of the Microstructure on the Hydrogen Diffusivity in Ni-Based Superalloy 718

Hydrogen Permeation, and Mechanical and Tribological Behavior, of CrNx Coatings Deposited at Various Bias Voltages on IN718 by Direct Current Reactive Sputtering

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