Effect of heat treatment on microstructure and oxidation properties of Inconel 625 processed by LPBF
Artikel i vetenskaplig tidskrift, 2020

This paper presents a study of the microstructure evolution due to oxidation exposure of Inconel 625 (IN625) alloy produced by Laser Powder Bed Fusion (LPBF). IN625 is a nickel-based superalloy characterized by good mechanical properties, excellent oxidation, and corrosion resistance from cryogenic temperatures up to 980 °C, allowing its wide use in various harsh environments. In order to enable the application of LPBF IN625 components at high temperatures, the oxidation properties and microstructure of as-built and post-heat treated LPBF IN625 alloy must be carefully investigated. For this reason, an extensive characterization of the oxidation behavior of the alloy in the as-built condition and after solution treatment was performed. For both these conditions, the oxidation treatments were performed at 900 °C up to 96 h. The characterization was performed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and scratch test analysis. The characteristics of the oxide layer and formed phases were investigated. The as-built IN625 state presented greater oxidation resistance compared to the solutionized IN625 one. The latter condition showed a defected oxide layer with the presence of Nb and Ni oxides inside the Cr oxide layer.

Laser powder bed fusion


Nickel-based superalloys

Inconel 625

Additive manufacturing

Microstructure evolution


Simone Parizia

Politecnico di Torino

Istituto Italiano di Tecnologia

Giulio Marchese

Politecnico di Torino

Masoud Rashidi

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Nanyang Technological University

Massimo Lorusso

Istituto Italiano di Tecnologia

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Diego Manfredi

Politecnico di Torino

Sara Biamino

Politecnico di Torino

Journal of Alloys and Compounds

0925-8388 (ISSN)

Vol. 846 156418


Bearbetnings-, yt- och fogningsteknik

Metallurgi och metalliska material




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