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Enhancing the formability of FeSi6.5 steel by the anodic polarization

International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2072-2078页

作者： Dong Zhao Feng Ye Binbin Liu Haoyang Du Yaakov B.Unigovski Emmanuel M.Gutman roni shneck State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China State Grid Jilin Electric Power Research Institute Jilin 130021China Department of Materials Engineering Ben-Gurion University of the NegevBeer-Sheva 84105Israel

The effect of anodic polarization on the plastic deformation behavior and formability of FeSi6.5 steel at room temperature was experimentally investigated through uniaxial tensile and drawing of wire specimen in sulfuric acid solution with current densities of 0-40 mA/*** formability of the FeSi6.5 steel was significantly improved after the anodic *** plastic elongation of the specimen as an anode in the electrochemical environment was 4.4%-7%,but 2.7%in the *** drawing force under the anodic polarization decreased by 12.5%-26%compared to that in deionized *** softening is mainly attributed to the relief in work hardening caused by surface atomic *** work hardening mechanism of the FeSi6.5 steel wires under anodic polarization condition was analyzed using Hollomon equation and Voce relation combined with the Kocks-Mecking *** data support the view that the surface atom dissolution facilitates dislocation ***6.5 steel wires were obtained using electrochemical cold drawing and presented a smooth surface and good ductility without crack after five-pass drawing with a total cross-section area reduction of 88%.The drawing with the assistance of anodic polarization is a promising technology for processing hard and brittle metal materials.

关键词： FeSi6.5 steel plastic deformation anodic polarization Voce equation

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Portevin-Le Chatelier Effect in Additively Manufactured and As-Cast Inconel 939 Nickel-Based Superalloy

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Journal of Minerals and Materials Characterization and Engineering 2024年第6期12卷 299-315页

作者： Moshe Nahmany Daniel Moreno Yohanan Nahmana Mathan Zakai Ariel Yehuda Cohen Moshe Shapira roni shneck Bet Shemesh Engines Ltd. FAA&EASA Bet Shemesh Israel Nuclear Research Center-Negev Beer Sheva Israel Department of Materials Science and Engineering Ben-Gurion University of the Negev Beer Sheva Israel

Nickel-based superalloys, well-established in aeronautics, have recently gained significant traction in additive manufacturing. Inconel 939 is one of the alloys increasingly playing a vital role in this field. This paper examines the development of the Portevin-Le Chatelier (PLC) effect in additively manufactured Inconel 939 in comparison with cast Inconel 939. A detailed analysis of tensile test characteristics was conducted, complemented by a high-resolution scanning electron microscopy (HR-SEM) investigation. The PLC region exhibited several properties during tensile testing, such as stress-strain behavior, cycle scale, and overall stress increase. The HR-SEM analysis of Gamma prime (γ') precipitates revealed distinct morphologies, which are suggested to be linked to the features of the PLC region. Samples with a high amount of γ' precipitates showed a less pronounced PLC region, while those with fewer γ' precipitates displayed a more distinct PLC effect. A mechanism for the cyclic drop-and-rise stress behavior, based on the work of Varvenne and La-Rose, was proposed, possibly induced by the varying morphologies of γ' precipitates in the IN939 alloy. Further study is needed to deepen the understanding of the relationship between the γ' micro-(nano) structure and the PLC phenomenon.

关键词： Inconel 939 Gamma Prime γ' Portevin-Le Chatelier (PLC) Dynamic Strain Aging DSA Mechanical Properties Additive Manufacturing Superalloys

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