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Influence of the iron content on the microstructure and electrochemical behavior of as-cast modified Inconel 625

2021; Elsevier BV; Volume: 193; Linguagem: Inglês

10.1016/j.corsci.2021.109892

1879-0496

Júlio César Lourenço, Luiz Paulo Pimentel de Souza, Maria Ismênia Sodero Toledo Faria, Carlos Ângelo Nunes, C.R. Tomachuk, Mark Baker,

Hydrogen embrittlement and corrosion behaviors in metals

Inconel 625 based alloys with different iron contents were prepared by arc-melting. Alloys with up to 5 wt% iron are composed of the γ matrix, metal monocarbides (MC) and Laves precipitates. Alloys with 10–15 wt% iron comprise the γ matrix and γ/Laves eutectic-like constituent. MC precipitates are cathodic and the Laves phase anodic with respect to the matrix. In 3.5 wt% NaCl, alloys with 10–15 wt%, iron showed improved corrosion behavior compared to 5 wt% iron due to absence of MC phase formation. The results are important as they potentially allow faster and more economical welding processes to be employed.