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Open AccessArticle

High Temperature Oxidation Behavior of Selective Laser Melting Manufactured IN 625

1
Romanian Research and Development Institute for Gas Turbines COMOTI, 220D Iuliu Maniu Av., 061126 Bucharest, Romania
2
Technical Sciences Academy of Romania, 26 Dacia Av., 1, 010413 Bucharest, Romania
3
National Research & Development Institute for Non-Ferrous and Rare Metals—IMNR, Biruințtei 102 Av., 077145 Pantelimon, Ilfov County, Romania
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 668; https://doi.org/10.3390/met10050668
Received: 15 April 2020 / Revised: 15 May 2020 / Accepted: 18 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Additive Manufacturing of Metals with Lasers)
The high-temperature oxidation behavior of selective laser melting (SLM) manufactured IN 625 was studied over 96 h of exposure at 900 °C and 1050 °C in air. An extensive analysis was performed to characterize the oxide scale formed and its evolution during the 96 h, including mass gain analysis, EDS, XRD, and morphological analysis of the oxide scale. The mass gain rate of the bare material increases rapidly during the first 8 h of temperature holding and diminishes at higher holding periods for both oxidation temperatures. High-temperature exposure for short periods (24 h) follows a parabolic law and promotes the precipitation of δ phase, Ni-rich intermetallics, and carbides. Within the first 24 h of exposure at 900 °C, a Cr2O3 and a (Ni, Fe)Cr2O4 spinel scale were formed, while at a higher temperature, a more complex oxide was registered, consisting of (Ni, Fe)Cr2O4, Cr2O3, and rutile-type oxides. Prolonged exposure of IN 625 at 900 °C induces the preservation of the Cr2O3 scale and the dissolution of carbides. Other phases and intermetallics, such as γ, δ phases, and MoNi4 are still present. The exposure for 96 h at 1050 °C led to the dissolution of all intermetallics, while the same complex oxide scale was formed. View Full-Text
Keywords: IN 625; SLM; oxidation; additive manufacturing IN 625; SLM; oxidation; additive manufacturing
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Condruz, M.R.; Matache, G.; Paraschiv, A.; Badea, T.; Badilita, V. High Temperature Oxidation Behavior of Selective Laser Melting Manufactured IN 625. Metals 2020, 10, 668.

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