Inhibition of metal dusting corrosion on Fe-based alloy by combined near surface severe plastic deformation (NS-SPD) and thermochemical treatment
Peer reviewed, Journal article
Published version
![Thumbnail](/ntnu-xmlui/bitstream/handle/11250/2982312/Guo_Vullum_Venvik_2021.pdf.jpg?sequence=6&isAllowed=y)
View/ Open
Date
2021Metadata
Show full item recordCollections
- Institutt for fysikk [2686]
- Institutt for kjemisk prosessteknologi [1776]
- Publikasjoner fra CRIStin - NTNU [38062]
Abstract
Combined NS-SPD and thermochemical treatment has been used to improve the metal dusting corrosion resistance of Incoloy 800. After testing under infinite carbon activity for 20−100 h, carbon was not found in the NS-SPD region while corrosion products formed in the non-NS-SPD region. The improved resistance is a result of the NS-SPD yielding a high density of defects in the deformation zone that developed into an ultra-fine-grained structure near the surface during the subsequent thermochemical treatment. These microstructural changes increase the effective diffusion coefficient for Cr in the alloy, hence promoting the formation of a highly protective oxide scale.