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The influence of reactive elements on The degradation of commercial Fe‐23Cr‐5Al alloys at high temperatures
Author(s) -
Jedlinski J.,
Borchardt G.,
Mrowec S.
Publication year - 1990
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.19900411210
Subject(s) - mischmetal , yttrium , zirconium , hafnium , materials science , metallurgy , alloy , spall , degradation (telecommunications) , isothermal process , metal , thermodynamics , telecommunications , physics , computer science , hydrogen storage , oxide
Abstract The influence of reactive elements on the oxidation behaviour of the commercial alloy Fe‐23Cr‐5Al was studied under isothermal and thermal cycling conditions in the temperature range 1473–1623 K. The following additions were used: metallic zirconium, the so‐called “mischmetal” (natural mixture of reactive and rate earth elements), elemental hafnium and yttrium and implanted yttrium. The efforts were directed to identify the mechanism of degradation of the materials under investigation. Elemental hafnium and yttrium additions were superior to the other additions, decreasing the scale growth rate and improving its resistance to spalling. The “mischmetal” additions improved the scale resistance to spalling but, simultaneously, considerably increased its growth rate. Both zirconium and implanted yttrium brought about some improvement of the scale resistance to spalling but their effect was restricted to less severe oxidation conditions.