The effects of boron additions on the oxidation of Fe-Cr alloys in high-temperature steam: Analytical results and mechanisms

Consequence of Nanometer‐Scale Property Variations to Macroscopic Properties of CrOCN Thin Films

“…As is usual with transition-metal oxides the O K edge, which is associated with a 1s-to-2p transition, has two distinct peaks. 12,13 The initial peak at 531 eV and one centered at about 542 eV are ascribed to hybridization of O 2p with empty Cr 3d orbitals. The broad peak above 560 eV is related to O 2p metal, 4sp hybridization.…”

Multi-scale characterization of stress corrosion cracking of cold-worked stainless steels and the influence of Cr content

“…However, boron enrichment at the crack tip has been observed in samples with and without boron added to the water, indicating that its main source is the residual boron in the alloys segregated to the grain boundary from the bulk during the solution treatment. It has been suggested in the literature that boron can take the role of the cation in high-temperature oxidation, forming (M x B 1Àx ) 2 O 3 compounds, where M is a transition metal [46]. Such a modification might confer protection to low-Cr regions by replacing the Cr in the oxide at the crack tip.…”

A review of the oxidation behaviour of structural alloys in steam

“…At temperatures higher than 700uC, an addition of 18%Ni promoted oxidation resistance equivalent to commercial 9-12%Cr steels Some beneficial effect has been noted for B on the oxidation of 9Cr-1Mo steels in steam at 600uC. 121 It is unclear what role is played by very low levels of B, but there is evidence that B segregates to the alloy/M 23 C 6 interfaces and is incorporated into the carbides, 122 apparently stabilising them. Such stabilised carbides possibly could provide a uniform distribution of effective reservoirs of Cr that could promote the development of protective Cr-rich oxide layers.…”