Premium
The relationship between duplex oxidation and structural stability in austenitic stainless steels
Author(s) -
McLauchlin I. R.,
Hales R.
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.19780290505
Subject(s) - austenite , materials science , ferrite (magnet) , thermal expansion , duplex (building) , metallurgy , oxide , composite material , microstructure , chemistry , dna , biochemistry
Samples of austenitic stainless steels from various sources have been thermally cycled. Many materials exhibited a volume expansion on cooling superimposed on the normal thermal contraction, as a result of an austenite → ferrite phase transformation. Samples of materials which exhibited the ferrite transformation also show a period of rapid oxidation on re‐exposure after cooling during the first autoclave shutdown of an oxidation test. It is proposed that the local volume expansion accompanying the formation of ferrite on cooling disrupts the initial protective oxide scale thereby allowing oxidation to proceed more rapidly.