Effect of microstructure on the passive behavior of selective laser melting-fabricated Hastelloy X in NaNO3 solution

Yin, Yingyue; Zhang, Jianhua; Huo, Jinxing; Zhao, Kai; Zhu, Xiangwei; Meng, Xiangyu; Han, Quanquan; Ma, Yucai; Fu, Zhensheng; Yin, Jianhua

doi:10.1016/j.matchar.2020.110370

Cited by 23 publications

(2 citation statements)

References 43 publications

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“…Electrochemical testing is generally used to reveal the mechanism and regularities of electrochemical behavior during ECM [26]. In the present study, Ti-6Al-4V was subjected to electrochemical testing (including polarization curves and EIS) in the aqueous NaCl electrolyte and NaCl-EG electrolyte.…”

Section: Experimental System and Arrangementmentioning

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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Section: Experimental System and Arrangementmentioning

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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show abstract

“…Compared with wrought Hastelloy X (HX)samples, SLM-fabricated HX shows many nuclear sites of great compact passive film due to the higher low-angle GB (LAGB) density. This compact passive film contributed to improving surface quality to avoid starry corrosion during the ECM process at low current density in non-machining areas [25]. Some reports have shown that AZ31 Mg alloy and Ti-6Al-4V within a large amount of acicular α0 martensite resulted in preferentially anodic dissolution under low current densities [26].…”

Section: Introductionmentioning

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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Passivation Behavior of Different Building Planes of Selective Laser Melting 316L Stainless Steel in 3.5% NaCl Solution

Gao

Liu

Yang

et al. 2023

steel research int.

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The passivation behavior of selective laser melting 316L stainless steel (SLM 316L SS) on different building planes is studied in 3.5% NaCl solution. The results show that the XOZ and YOZ planes have a semicircular molten pool structure, and the XOY plane shows a columnar molten pool structure. Meanwhile, the XOZ planes have relatively smaller grain sizes and higher low-angle grain boundaries (LAGBs) proportionate than that of YOZ and XOY planes. The electrochemical testing results illustrate that the XOZ plane has a lower corrosion tendency than that of YOZ and XOY planes, as the thicker passive film with higher content of Cr 2 O 3 is detected on the XOZ plane. The XOZ plane, which has a higher Cr ox þ hy /(Fe ox þ hy þ Cr ox þ hy ) ratio, has excellent passivation performance and better electrochemical properties than the other two planes.

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Effect of microstructure on the passive behavior of selective laser melting-fabricated Hastelloy X in NaNO3 solution

Cited by 23 publications

References 43 publications

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

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

Passivation Behavior of Different Building Planes of Selective Laser Melting 316L Stainless Steel in 3.5% NaCl Solution

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