Microstructure Evolution of Selective Laser Melted Inconel 718: Influence of High Heating Rates
| Autor: | Farhad Rezai-Aria, Seyedmohammad Tabaie, Mohammad Jahazi |
|---|---|
| Přispěvatelé: | Ecole de Technologie Supérieure [Montréal] (ETS), Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
differential thermal analysis
lcsh:TN1-997 Materials science phase transformation Inconel 718 02 engineering and technology Laves phase 01 natural sciences [SPI]Engineering Sciences [physics] Differential thermal analysis 0103 physical sciences General Materials Science Selective laser melting Composite material Inconel Dissolution lcsh:Mining engineering. Metallurgy 010302 applied physics Precipitation (chemistry) Metals and Alloys high heating rate 021001 nanoscience & nanotechnology Microstructure Superalloy selective laser melting 0210 nano-technology |
| Zdroj: | Metals, Vol 10, Iss 587, p 587 (2020) Metals Metals, MDPI, 2020, 10 (5), pp.1-21/587. ⟨10.3390/met10050587⟩ Metals, 2020, 10 (5), pp.1-21/587. ⟨10.3390/met10050587⟩ Volume 10 Issue 5 |
| ISSN: | 2075-4701 |
| Popis: | Inconel 718 (IN718) superalloy samples fabricated by selective laser melting (SLM) were submitted to different heating cycles and their microstructural characteristics were investigated. The selected heating rates, ranging from 10 ° C/min to 400 ° C/s, represent different regions in the heat-affected zone (HAZ) of welded additively manufactured specimens. A combination of differential thermal analysis (DTA), high-resolution dilatometry, as well as laser confocal and electron microscopy were used to study the precipitation and dissolution of the secondary phases and microstructural features. For this purpose, the microstructure of the additively manufactured specimen was investigated from the bottom, in contact with the support, to the top surface. The results showed that the dissolution of &gamma &rdquo and &delta phases were delayed under high heating rates and shifted to higher temperatures. Microstructural analysis revealed that the Laves phase at the interdendritic regions was decomposed in specific zones near the surface of the samples. It was determined that the thickness and area fraction of these zones were inversely related to the applied heating rate. A possible mechanism based on the influence of heating rate on Nb diffusion in the interdendritic regions and core of the dendrites is proposed to interpret the observed changes in the microstructure. |
| Databáze: | OpenAIRE |
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