On Water Induced Sensitization of Ni (Fe,Cr) alloys towards Stress Corrosion Cracking in LWR Piping from 1st Principles Modelling
Rapport, 2021

In Swedish Light Water Reactors (LWR), stress corrosion cracking of reactor components and welds occurs from time to time. As the nuclear power plants are ageing, it is essential to study and further understand the mechanism for environmentally induced sensitization. Natural cracking is a phenomenon that is difcult to predict and very hard to study since it occurs suddenly and often unexpectedly. In order to study the crack initiation and growth, the crack is traditionally experimentally provoked and it is not known to what degree these experimental cracks correspond to those that occur naturally. The environment in an LWR contributes to material ageing through chemical reactions with the environment. An in-depth examination has shown that the microstructures of oxide flms changes along the crack path and the oxide flm in the crack tip is signifcantly diferent from what one detects at the crack opening. In this study, 1st principles modelling is used to articulate an environment induced sensitization mechanism for stress corrosion cracking of Ni(Fe,Cr) alloys in LWR conditions.

hydrogen pick-up

modelling

Chromium

sensitisation

diffusivity

beyond crack-tip

control

Författare

Vedad Babic

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi 2

Valentina Cantatore

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi 2

Christine Geers

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Jiaxin Chen

Studsvik

Itai Panas

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi 2

Styrkeområden

Materialvetenskap

Ämneskategorier

Korrosionsteknik

Utgivare

Strålsäkerhetsmyndigheten (SSM)

Mer information

Senast uppdaterat

2021-05-11