ISSN:
1573-4889
Keywords:
AISI 446
;
Ion Implantation
;
Oxidation-Sulfidation
;
Fe-Cr Alloy
;
Ce-effect
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract AISI 446 steel exhibited parabolic rate kinetics from the beginning during isothermal oxidation in oxygen at 850°C. On the other hand, a pronounced transient oxidation with faster kinetics was observed in Ce- and Xe-implanted AISI 446 steels. The implantation, however, did not affect the steady-state parabolic rate constant, 3.77±0.18×10−5 mg2/cm4 min. The initial response of implanted steels to oxidation with pronounced transient oxidation was attributed to the physical defects of implantation. The oxide grains formed on AISI 446 early in the process of oxidation were rich in Fe and Cr, and after long exposure the spinel MnCr2O4 became the major constituent of the scale. Ce-implantation did not have any effect on the corrosion behavior of AISI 446 in H2/H2O/H2S/Ar at 850°C. The scale had three zones: an outer layer with FeS, (FeCr)S, and spinel oxide; an intermediate layer of (FeCr)S; and an inner layer of Cr-rich oxide and (FeCr)S below the original metal surface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00664424
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