Stabilization of austenitic structure in transition zone of 'austenitic stainless steel/NiCr alloy' joint fabricated by wire-feed electron beam melting
| Autor: | E. A. Kolubaev, M.Yu. Panchenko, E. V. Melnikov, Kseniya A. Reunova, Galina G. Maier, Valentina Moskvina, Sergey V. Astafurov, Elena G. Astafurova |
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| Rok vydání: | 2020 |
| Předmět: |
Austenite
Materials science Fabrication Mechanical Engineering Metallurgy Alloy chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness 0104 chemical sciences Nickel chemistry Mechanics of Materials engineering General Materials Science Nichrome Austenitic stainless steel 0210 nano-technology |
| Zdroj: | Materials Letters. 277:128321 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2020.128321 |
| Popis: | The gradient material “stainless steel/NiCr alloy” has been designed using the additive manufacturing method – double wire-feed electron-beam melting. The effect of gradual addition of Ni-based alloy on phase transformation and microstructure in additively-fabricated “stainless steel/NiCr alloy” joint has been revealed. Despite the abrupt change in wire composition during the fabrication of the joint, the wide transition zone is formed between two parts of the additively-manufactured billet: γ-austenitic matrix and dendritic δ-ferrite in steel part gradually passing into Fe-based austenite, then into Ni-based austenite, and, finally, into γ-(Ni,Cr) austenite with cellular-shape dendrites in NiCr part. The steel-based transition zone of the as-built joint possesses pure austenitic structure stabilized by nickel in comparison with two-phase dendritic microstructure typical for additively-manufactured CrNi stainless steel. The increased microhardness (2.3–2.4 GPa) corresponds to stable austenitic steel structure of the joint. |
| Databáze: | OpenAIRE |
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