Surface Modification of Additively Manufactured Inconel 718 Alloy by Low-Energy High-Current Electron Beam Irradiation

被引:0
作者
Demirtas, Muhammet [1 ]
Ivanov, Konstantin V. [2 ]
Purcek, Gencaga [3 ]
Yanar, Harun [3 ]
Kaynak, Yusuf [4 ]
机构
[1] Samsun Univ, Dept Aerosp Engn, TR-55420 Samsun, Turkiye
[2] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Akad Chesky 2-4, Tomsk 634055, Russia
[3] Karadeniz Tech Univ, Dept Mech Engn, TR-61080 Trabzon, Turkiye
[4] Marmara Univ, Technol Fac, Dept Mech Engn, TR-34854 Istanbul, Turkiye
关键词
additive manufacturing; Inconel-718; irradiation; low-energy high-current electron beam; microstructure; nanohardness; phase composition; MECHANICAL-PROPERTIES; HEAT-TREATMENT; CORROSION-RESISTANCE; LAVES PHASE; MICROSTRUCTURE; STEEL; POROSITY; WEAR; SUPERALLOY; PARAMETERS;
D O I
10.1002/adem.202400633
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of low-energy high-current electron beam (LEHCEB) irradiation on the microstructure and nanohardness of Inconel 718 alloy produced by laser powder bed fusion additive manufacturing is investigated. The LEHCEB irradiation is applied to the alloy at three energy levels, and the resulting microstructural analysis of irradiated surfaces is conducted. The findings from this study demonstrate that the LEHCEB irradiation substantially changes the as-built microstructure showing intragranular dendrites of different shapes and irregular-shaped Laves phases. The columnar structure is formed in the modified near-surface layer as a result of rapid heating and cooling during LEHCEB irradiation. Furthermore, all Laves phases dissolve in the modified layer. Nanoindentation hardness of the irradiated layer of the alloy increases from 593 +/- 23 to 693 +/- 13 Hv with the highest energy density of 15 J cm-2. This increment is attributed mainly to the dissolution of Laves phases and the formation of an ultrafine columnar structure where the columns are separated from each other by the district regions containing very thin interlayers of a secondary phase and a high amount of dislocations. Low-energy high-current electron beam irradiation substantially changes the as-built microstructure and results in the formation of ultrafine columnar structure in the modified near-surface layer. Furthermore, all Laves phases dissolve in the modified layer. These microstructural alterations result in a considerable increase in the surface nanohardness of the AMed Inconel 718 alloy.image (c) 2024 WILEY-VCH GmbH
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页数:11
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