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 111234Investigating 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