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Effect of thermal cycling on the high temperature oxidation resistance of austenitic AISI 309S stainless steel
Author(s) -
Pérez F. J.,
Pedraza F.,
Sanz C.,
Hierro M. P.,
Gómez C.
Publication year - 2002
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 - 10.1002/1521-4176(200204)53:4<231::aid-maco231>3.0.co;2-b
Subject(s) - isothermal process , chromia , metallurgy , temperature cycling , spallation , oxide , austenite , internal oxidation , chemistry , materials science , spinel , alloy , thermal , thermodynamics , physics , microstructure , nuclear physics , neutron
A conventional austenitic AISI 309S stainless steel has been subjected to high temperature oxidation at 950°C under atmospheric pressure of air. Isothermal as well as 1 h and 10‐h cyclic oxidation runs have been conducted in order to get acquainted with the resistance of this steel to establish and maintain the oxide scales upon such aggressive environments. It will be shown that upon isothermal oxidation, the steel develops chromia and Cr‐Mn spinel oxides and some internal oxidation of Si‐rich oxide structures which may peg the scale to the alloy. The nature of the oxide phases has not changed upon thermal cycling, but spallation is more extensive in the 1 h than in the 10‐h cycles. In the former, Fe‐rich nodules are also developed at the outermost part of the scale, bringing about loss of the protective behaviour of the mixed scales. On the contrary, the 10‐h cycled specimens similarly behave to those isothermally oxidised.