Intergranular oxidation of additively manufactured Ni-base alloy 625: The role of Si
Journal article, 2023

Additively manufactured (AM) Ni-base alloy 625 exposed in air and H2/H2O at 900 °C has been shown to suffer from intergranular oxidation attack unlike its conventionally manufactured (CM) variant. Modification of the AM microstructure via hot-rolling and heat-treatment did not alter the oxidation pattern. Detailed analysis of minor differences in chemical composition of AM and CM exposed the critical role of Si in oxidation protection of alloy 625. Experiments with model alloys as well as diffusion modeling confirmed the crucial role of a minimum Si concentration to form a SiO2 subscale preventing thereby intergranular oxidation attack.

High-temperature corrosion

Alloy 625

Intergranular oxidation

Additive manufacturing

Oxidation

Ni-base alloys

Author

Anton Chyrkin

Chalmers, Chemistry and Chemical Engineering, Energy and Material

W. J. Nowak

Rzeszów University of Technology

Kerem Gündüz

Gebze Institute of Technology (GYTE)

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Irina Fedorova

Chalmers, Physics, Microstructure Physics

Mohammad Sattari

Chalmers, Physics, Microstructure Physics

Jan Froitzheim

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Mats Halvarsson

Chalmers, Physics, Microstructure Physics

Marta Krystyna Stiller

Chalmers, Physics, Microstructure Physics

Corrosion Science

0010-938X (ISSN)

Vol. 219 111234

Investigating carbon-induced dual atmosphere corrosion

Swedish Foundation for Strategic Research (SSF) (UKR22-0047), 2022-07-01 -- 2024-12-31.

Subject Categories

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

DOI

10.1016/j.corsci.2023.111234

More information

Latest update

5/25/2023