scholarly journals Fabrication of Fe-based metallic glass reinforced FeCoNiCrMn high-entropy alloy through additive manufacturing: Mechanical property enhancement and corrosion resistance improvement

2021 ◽  
Author(s):  
Zhenghang Ma ◽  
Qiang Zhai ◽  
Kunlun Wang ◽  
Guoxia Chen ◽  
Xiaotian Yin ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Metallic Glass ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Resistance Improvement

Bimetal printing of high entropy alloy/metallic glass by laser powder bed fusion additive manufacturing

2022 ◽  
Vol 141 ◽  
pp. 107430
Author(s):  
Hao Wang ◽  
Junquan Chen ◽  
Hailu Luo ◽  
Di Wang ◽  
Changhui Song ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Metallic Glass ◽  
High Entropy Alloy ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
High Entropy

scholarly journals Tribo-corrosion response of additively manufactured high-entropy alloy

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Jibril Shittu ◽  
Maryam Sadeghilaridjani ◽  
Mayur Pole ◽  
Saideep Muskeri ◽  
Jie Ren ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Surface Passivation ◽  
Extreme Environments ◽  
Open Circuit ◽  
High Entropy Alloy ◽  
Continuous Change ◽  
Sharp Drop ◽  
High Entropy ◽  
Net Shaping

AbstractHigh-entropy alloys (HEAs) with multiple principal elements represent a paradigm shift in structural alloy design and show excellent surface degradation resistance in corrosive environment. Here, the tribo-corrosion response of laser-engineered net-shaped CoCrFeMnNi HEA was evaluated in 3.5 wt% NaCl solution at room temperature. The additively manufactured (AM-ed) CoCrFeMnNi showed five times lower wear rate, regenerative passivation, and nobler corrosion potential during tribo-corrosion test compared to its arc-melted counterpart. A significant anisotropy was seen in the tribo-corrosion response with 45° to the build direction showing better performance compared to tests along the build direction and perpendicular to it. The open circuit potential curves were characterized by a sharp drop to more negative values as wear began, followed by continuous change for the active tribo-corrosion duration and finally a jump to nobler value at the end of the test indicating excellent surface re-passivation for the AM-ed alloy. The superior tribo-corrosion resistance of AM-ed CoCrFeMnNi was attributed to the refined microstructure and highly protective surface passivation layer promoted by the sub-grain cellular structure formed during additive manufacturing. These results highlight the potential of utilizing additive manufacturing of HEAs for use in extreme environments that require a combination of tribo-corrosion resistance, mechanical durability, extended service life, and net shaping with low dimensional tolerance.

Corrosion resistance enhancement of CoCrFeMnNi high-entropy alloy fabricated by additive manufacturing

2020 ◽  
Vol 177 ◽  
pp. 108954
Author(s):  
Zhenlin Xu ◽  
Hui Zhang ◽  
Xiaojie Du ◽  
Yizhu He ◽  
Hong Luo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3071
Author(s):  
Andri Isak Thorhallsson ◽  
Francesco Fanicchia ◽  
Emily Davison ◽  
Shiladitya Paul ◽  
Svava Davidsdottir ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Microstructural Characterization ◽  
Corrosion Damage ◽  
Process Equipment ◽  
High Entropy Alloy ◽  
Low Alloy Steels ◽  
Manufacturing Defects ◽  
High Entropy ◽  
Alloy Steels ◽  
Resistance Performance

Geothermal process equipment and accessories are usually manufactured from low-alloy steels which offer affordability but increase the susceptibility of the materials to corrosion. Applying erosion-corrosion-resistant coatings to these components could represent an economical solution to the problem. In this work, testing of two newly developed laser metal deposited high-entropy alloy (LMD-HEA) coatings—CoCrFeNiMo0.85 and Al0.5CoCrFeNi, applied to carbon and stainless steels—was carried out at the Hellisheidi geothermal power plant. Tests in three different geothermal environments were performed at the Hellisheidi site: wellhead test at 194 °C and 14 bar, erosion test at 198 °C and 15 bar, and aerated test at 90 °C and 1 bar. Post-test microstructural characterization was performed via Scanning Eletron Microscope (SEM), Back-Scattered Electrons analysis (BSE), Energy Dispersive X-ray Spectroscopy (EDS), optical microscopy, and optical profilometry while erosion assessment was carried out using an image and chemical analysis. Both the CoCrFeNiMo0.85 and Al0.5CoCrFeNi coatings showed manufacturing defects (cracks) and were prone to corrosion damage. Results show that damage in the CoCrFeNiMo0.85-coated carbon steel can be induced by manufacturing defects in the coating. This was further confirmed by the excellent corrosion resistance performance of the CoCrFeNiMo0.85 coating deposited onto stainless steel, where no manufacturing cracks were observed.

scholarly journals Corrosion Behavior and Surface Treatment of Cladding Materials Used in High-Temperature Lead-Bismuth Eutectic Alloy: A Review

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 364
Author(s):  
Hao Wang ◽  
Jun Xiao ◽  
Hui Wang ◽  
Yong Chen ◽  
Xing Yin ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Liquid Metal ◽  
Energy Demand ◽  
Ceramic Coatings ◽  
High Entropy Alloy ◽  
Pressurized Water ◽  
Corrosion Morphology ◽  
High Entropy ◽  
Lead Bismuth Eutectic

Liquid metal fast reactors were considered to be the most promising solution to meet the enormous energy demand in the future. However, corrosion phenomenon caused by the liquid metal, especially in high-temperature lead-bismuth coolant, has greatly hindered the commercialization of the advanced Generation-IV nuclear system. This review discussed current research on the corrosion resistance of structural materials (such as EP823, T91, ODS, and authentic steels) in high-temperature liquid metal served as reactor coolants. The current corrosion resistance evaluation has proved that even for the excellent performance of EP823, the structural material selected in pressurized water reactor is not the ideal material for operation in the high-temperature lead-bismuth eutectic (LBE). Furthermore, the latest coating technologies that are expected to be applied to cladding materials for coolant system were extensively discussed, including Al-containing coatings, ceramic coatings, oxide coatings, amorphous coatings and high-entropy alloy coatings. The detailed comparison summarized the corrosion morphology and corrosion products of various coatings in LBE. This review not only provided a systematic understanding of the corrosion phenomena, but also demonstrated that coating technology is an effective method to solve the corrosion issues of the advanced next-generation reactors.

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