Hydrogen embrittlement of nodular cast iron

Patrik Sahiluoma*, Yuriy Yagodzinskyy, Antti Forsström, Hannu Hänninen, Sven Bossuyt

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

1 Sitaatiot (Scopus)
42 Lataukset (Pure)

Abstrakti

Ferritic nodular cast iron, intended for use as the material for inserts of canisters for long-term geological disposal of spent nuclear fuel, was studied for hydrogen sensitivity. In the canisters, the insert provides the mechanical strength against external loads. Hydrogen was charged from 0.1 N H(2)SO(4)solution in free-corrosion tests and under controlled cathodic potential. Hydrogen uptake and trapping were then measured using thermal desorption spectroscopy. The hydrogen desorption rate after hydrogen charging manifests two distinct peaks. Plastic deformation during hydrogen charging increases the hydrogen uptake considerably. Hydrogen reduces the elongation to fracture and time to fracture in slow strain rate testing and constant load testing (CLT), respectively. Especially, the strain rate in CLT is dramatically increased. The appearance of hydrogen-induced cracking in the ferrite phase changes from ductile dimple fracture to brittle cleavage fracture due to hydrogen charging, which initiates from the interphases of the graphite nodules. The results are discussed in terms of the role of hydrogen and the graphite nodules in hydrogen embrittlement of ductile cast iron.

AlkuperäiskieliEnglanti
Sivut245-254
Sivumäärä10
JulkaisuMATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Vuosikerta72
Numero1-2
Varhainen verkossa julkaisun päivämäärä22 heinäkuuta 2020
DOI - pysyväislinkit
TilaJulkaistu - tammikuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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