Year: 2026
Type: article
Abstract: The decarburization behavior of Fe–Cr–Ni alloys containing small amounts of carbon was investigated under static high-temperature hydrogen exposure, covering a wide compositional range from ferritic and austenitic stainless steels to Ni-based alloys. Under hydrogen exposure at 800 °C, a clear compositional dependence was observed: decarburization was negligible in the ferritic alloy, whereas the austenitic alloys exhibited noticeable decarburization with a distinct dependence on Ni content. This behavior was rationalized by considering both carbon diffusivity and the formation of an oxide barrier, whose protective effect weakens with increasing Ni content. The results provide fundamental insights into the thermodynamic and kinetic factors governing decarburization in Fe-Cr-Ni alloys, offering a guideline for material selection in hydrogen-containing high-temperature environments.
Source: ISIJ International
Authors: Satoru Kobayashi, Yuki Tsuda
Institutions: Tokyo Institute of Technology, Institute of Science Tokyo
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $700
Funder: JKA Foundation
OpenAlex ID: W7127922980