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The high temperature oxidation behaviour of austenitic stainless steels
Author(s) -
Hales Royden
Publication year - 1978
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19780290603
Subject(s) - materials science , oxide , duplex (building) , metallurgy , austenite , annealing (glass) , ternary operation , chromium , kinetics , grain boundary , austenitic stainless steel , grain size , growth rate , atmospheric temperature range , microstructure , thermodynamics , corrosion , chemistry , dna , physics , geometry , mathematics , quantum mechanics , computer science , biochemistry , programming language
Abstract High temperature annealing in a dynamic vacuum has been utilised to induce the growth of duplex oxide over the whole surface of stainless steel specimens. It is found that duplex oxide grows at a rate which does not obey a simple power law. The oxidation kinetics and oxide morphology have also been studied for a series of ternary austenitic alloys which cover a range of composition between 5 and 20% chromium. A model has been developed from the observations to describe the formation of duplex oxide and the subsequent formation of a “healing layer” which virtually causes the oxidation process to stop. This phase tends to form at grain boundaries and a relationship has been derived for the reaction kinetics which relates the reaction rate with grain size of the substrate.