Stress corrosion cracking (SCC) of nickel-based alloys

Rebak, Raúl B.

doi:10.1533/9780857093769.3.273

Cited by 19 publications

(11 citation statements)

References 32 publications

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“…The Alloy 625 obtained by LPBF was not susceptible to chloride stress corrosion cracking within the timeframe tested in neither as-built conditions nor after heat treatment, thus displaying a similar resistance for the same alloy obtained by traditional hot working techniques [41].…”

Section: Discussionmentioning

confidence: 84%

“…A recent model developed by Jothi et al [46] evidenced that hydrogen diffusion and segregation in micro-polycrystalline and nano-polycrystalline material between grains and grain boundaries were inhomogeneous and much greater hydrogen concentrations were accumulated at grain boundaries than within grains. Hydrogen diffusion and segregation was greater in nano-polycrystalline material due to the higher density of grain boundaries [41]. It could be postulated that hydrogen diffusion through the UT-LPBF specimens during pre-charge should be more efficient than that on HT-LPBF specimens owing to the finer microstructure.…”

Section: Discussionmentioning

confidence: 99%

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Stress Corrosion Cracking of Additively Manufactured Alloy 625

et al. 2021

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Laser bed powder fusion (LPBF) is an additive manufacturing technology for the fabrication of semi-finished components directly from computer-aided design modelling, through melting and consolidation, layer upon layer, of a metallic powder, with a laser source. This manufacturing technique is particularly indicated for poor machinable alloys, such as Alloy 625. However, the unique microstructure generated could modify the resistance of the alloy to environment assisted cracking. The aim of this work was to analyze the stress corrosion cracking (SCC) and hydrogen embrittlement resistance behavior of Alloy 625 obtained by LPBF, both in as-built condition and after a standard heat treatment (grade 1). U-bend testing performed in boiling magnesium chloride at 155 and 170 °C confirmed the immunity of the alloy to SCC. However, slow strain rate tests in simulated ocean water on cathodically polarized specimens highlighted the possibility of the occurrence of hydrogen embrittlement in a specific range of strain rate and cathodic polarization. The very fine grain size and dislocation density of the thermally untreated specimens appeared to increase the hydrogen diffusion and embrittlement effect on pre-charged specimens that were deformed at the high strain rate. Conversely, heat treatment appeared to mitigate hydrogen embrittlement at high strain rates, however at the slow strain rate all the specimens showed a similar behavior.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking of Additively Manufactured Alloy 625

et al. 2021

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“…Alloy 625 sheets are typically supplied in two grades: soft annealed (grade I) and solution annealed (grade II), with differences in their properties. It is interesting to note that alloy 625 may be chosen for low or high temperature applications 4 , 5 . For example, grade I might have higher mechanical properties than grade II.…”

Section: Introductionmentioning

confidence: 99%

Mitigating the susceptibility to intergranular corrosion of alloy 625 by friction-stir welding

Lemos

Farina

Piaggio

et al. 2022

Sci Rep

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In this work, friction-stir welding (FSW) was employed to alloy 625 grade I (soft annealed) sheets. Therefore, solid-state based welding was undertaken with a tool rotational speed of 200 rpm and a welding speed of 1 mm/s. Microstructural features were analyzed by light optical and scanning electron microscopy (LOM and SEM). Moreover, microhardness measurements were performed. The susceptibility to intergranular corrosion was verified by the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. Complementary, intergranular corrosion was also evaluated by the ASTM G28 Method A. FSW promoted grain refinement, increased microhardness, and reduction in the degree of sensitization. Finally, the mean corrosion rate observed in the ASTM G28 Method A test was 0.4406 mm/year, which suggests a good weld quality.

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“…Alloy 625 sheets are typically supplied in two grades: soft annealed (grade I) and solution annealed (grade II), with differences in their properties. It is interesting to note that the alloy 625 may be chosen for low or high temperature applications [4,5]. For example, grade I might have higher mechanical properties than grade II.…”

Section: Introductionmentioning

confidence: 99%

Friction Stir Welding: Mitigating the Susceptibility to Intergranular Corrosion of Alloy 625

Lemos

Farina

Piaggio

et al. 2021

Preprint

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In this work, friction stir welding (FSW) was employed to alloy 625 grade I (soft annealed) sheets. Therefore, solid-state based welding was undertaken with a tool rotational speed of 200 rpm and welding speed of 1 mm/s. Microstructural features were analyzed by light optical and scanning electron microscopy (SEM). Moreover, microhardness measurements were performed. The susceptibility to intergranular corrosion was verified by the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. Complementary, intergranular corrosion was evaluated by ASTM G28 Method A. FSW promoted grain refinement, increased microhardness, and reduction in the degree of sensitization. Finally, the mean corrosion rate observed in the ASTM G28A test was 0.4406 mm/year, which suggests a good weld quality.

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Stress corrosion cracking (SCC) of nickel-based alloys

Cited by 19 publications

References 32 publications

Stress Corrosion Cracking of Additively Manufactured Alloy 625

Stress Corrosion Cracking of Additively Manufactured Alloy 625

Mitigating the susceptibility to intergranular corrosion of alloy 625 by friction-stir welding

Friction Stir Welding: Mitigating the Susceptibility to Intergranular Corrosion of Alloy 625

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