Effect of microstructure on the electrochemical dissolution behaviour of Hastelloy® X superalloy processed by selective laser melting and heat treatments

Yin, Yingyue; Zhang, Jianhua; Yang, Shengzhao; Liu, Tong; Han, Quanquan; Zhen-hua, Zhang; Hu, Yang

doi:10.1016/j.matdes.2021.109828

Cited by 27 publications

(7 citation statements)

References 53 publications

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“…In addition, not only GBs but also the high dislocation densities are known to function as nucleation sites for the surface Ni(OH) 2 film. [ 38 ] Hence, we also collected geometrically necessary dislocation (GND) density images, which represent the density of dislocations (Figure S8, Supporting Information). The results show that the X ‐scan Ni‐SCR exhibited 1.46‐, 1.33‐, and 1.48‐fold greater density on its XY , XZ , and YZ planes, respectively, compared with the XY ‐scan Ni‐SCR.…”

Section: Resultsmentioning

confidence: 99%

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Kim

Mori

Nakano

et al. 2023

Adv Funct Materials

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The methanation of CO2 has been actively pursued as a practical approach to mitigating global climate change. However, the complexity of the catalyst development process has hindered the development of new catalysts for CO2 methanation; as a result, few catalysts are commercially available. Herein, a multifunctional self‐catalytic reactor (SCR) is prepared via metal 3D printing and selective electrochemical dissolution as a method to not only simplify the catalyst development process but also fabricate active catalysts for CO2 methanation. The combination of metal 3D printing and selective electrochemical dissolution is demonstrated as a feasible method to prepare active catalysts for the methanation of CO2 in a short time. In addition, the use of an electrochemical method enables the formation of galvanic cells on the SCR; these cells continuously generate active sites via self‐dissolution during a simple refresh process, resulting in high reusability of the SCR. The proposed method represents a new facile technique to fabricate highly reusable catalysts that exhibit superior performance for CO2 methanation, and the results provide a guideline for preparing metal 3D‐printed catalysts that will satisfy industrial demand.

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Section: Resultsmentioning

confidence: 99%

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Kim

Mori

Nakano

et al. 2023

Adv Funct Materials

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“…Comparing the Nyquist plots for Ti-6Al-4V in the two electrolytes in Figure 6, the curvature of the high-frequency region in the NaCl-EG electrolyte is significantly greater than that in the aqueous NaCl electrolyte. The curvature of the Nyquist plot in the high-frequency range reflects the influence of R ct on the material's surface [27], and the greater curvature in this frequency range indicates that the electrochemical reactions become more difficult with increasing R ct [28]. The fitting results in Table 5 show that the R ct of Ti-6Al-4V in the NaCl-EG electrolyte is significantly higher than that in the aqueous NaCl electrolyte, indicating that Ti-6Al-4V has a better corrosion resistance in the NaCl-EG electrolyte.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Jet Electrochemical Micromilling of Ti-6Al-4V Using NaCl–Ethylene Glycol Electrolyte

Niu,

Huang,

Ming

et al. 2024

Micromachines

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Titanium alloys are widely used in aerospace and biomedicine because of their excellent mechanical characteristics, but these properties also make such alloys difficult to cut. Jet electrochemical micromilling (JEMM) is based on the principle of electrochemical anodic dissolution; it has some inherent advantages for the machining of titanium alloy microstructures. However, titanium oxidizes readily, forming an oxide film that impedes a uniform dissolution during electrochemical machining. Therefore, a high voltage and an aqueous NaCl electrolyte are usually used to break the oxide film, which can lead to severe stray corrosion. To overcome this problem, the present study investigated the JEMM of Ti-6Al-4V using a NaCl–ethylene glycol (NaCl-EG) electrolyte. Electrochemical testing showed that Ti-6Al-4V exhibits a better corrosion resistance in the NaCl-EG electrolyte compared to the aqueous NaCl electrolyte, thereby reducing stray corrosion. The localization and surface quality of the grooves were enhanced significantly when using JEMM with a NaCl-EG electrolyte. A multiple-pass strategy was adopted during JEMM to improve the aspect ratio, and the effects of the feed depth and number of passes on the multiple-pass machining performance were investigated. Ultimately, a square annular microstructure with a high geometric dimensional consistency and a smooth surface was obtained via JEMM with multiple passes using the optimal parameters.

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“…NaNO3, NaClO3 and NaCl solution was used as the electrolyte, and the surface air oxide film was removed by polarization for 2 min at a constant potential of −1.2 V [24]. All the tests were performed potentiodynamically with a scan rate of 1 mV/ s, starting from -1.5 V to 1.5V.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

Effects of processing parameters on the surface quality of wrought Ni-based superalloy by ultrasonic-assisted electrochemical grinding

Yin

Zhang

et al. 2022

Int J Adv Manuf Technol

Self Cite

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Ni-based GH625 superalloy has been widely employed in the aerospace industry due to its high strength, outstanding corrosion resistance and high temperature resistance. A novel hybrid processing method of ultrasonic-assisted electrochemical grinding (UAECG) can achieve the high-effective removal rate for difficult-to-process materials and thereby avoids the stray corrosion during the process. This study systematically investigated the electrochemical dissolution behaviors of GH625 alloy at low current density and effects of processing parameters on its surface roughness. A qualitative model was proposed to further reveal its removal mechanism for GH625 alloy during UAECG process. Polarization curves depicted that an efficient and stable electrochemical dissolution was achieved at an appropriate temperature (20℃) and concentration (10 wt.%) of NaNO3 electrolyte. The findings also revealed that selective corrosion preferentially occurred on the grain boundary or near the NbC carbides under different current density corrosion circumstance. Compared with ECG process, the excellent surface quality (Ra = 0.37 μm) and taper of the small holes (taper = 0.04 ± 0.005°) are obtained at the optimized condition of pulse voltage of 5.8V, feed rate of 0.6mm /min, cathode speed of 12kr /min and ultrasonic drive amplitude of 60 % by UAECG technology.

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Effect of microstructure on the electrochemical dissolution behaviour of Hastelloy® X superalloy processed by selective laser melting and heat treatments

Cited by 27 publications

References 53 publications

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Jet Electrochemical Micromilling of Ti-6Al-4V Using NaCl–Ethylene Glycol Electrolyte

Effects of processing parameters on the surface quality of wrought Ni-based superalloy by ultrasonic-assisted electrochemical grinding

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Effect of microstructure on the electrochemical dissolution behaviour of Hastelloy® X superalloy processed by selective laser melting and heat treatments

Cited by 27 publications

References 53 publications

Robust Self‐Catalytic Reactor for CO2 Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Robust Self‐Catalytic Reactor for CO2 Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Jet Electrochemical Micromilling of Ti-6Al-4V Using NaCl–Ethylene Glycol Electrolyte

Effects of processing parameters on the surface quality of wrought Ni-based superalloy by ultrasonic-assisted electrochemical grinding

Contact Info

Product

Resources

About

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution

Robust Self‐Catalytic Reactor for CO₂ Methanation Fabricated by Metal 3D Printing and Selective Electrochemical Dissolution