One of the main reasons for the decline of lifetime and premature depreciation of the heat resistant cast steels, with long-term high temperature application, is simultaneous carburization and oxidation of these steels in gaseous atmosphere of CO2.Thus in order to study this effect, the CO2 gas heating-test was carried out in the laboratory and the heat resistant HH cast steel (according to the ACI standard) as well as two other heat resistant cast steels which had different chemical compositions were studied and tested. In order to examine the surface layers, the Electron Microscope and Energy Dispersive X-ray Spectroscopy (EDS) analysis were used. To examine the variations in the structure as a result of carburization, the Optical-Microscope was used. Also the EDS analysis was applied for identification of phases in samples' structure. Moreover, the variation of the carbon concentration in the direction of the samples’ thickness was studied. The studies showed that the steels which have more chromium and nickel, are more resistant in relation to this effect or phenomenon, and have less absorption in comparison with other samples.

Subject
Abrasive blasting, Steel structures, Energy dispersive X-ray spectroscopy, Steel surfaces, Carbides, Chromium, Oxide layers, Oxide surfaces, Heat, Surface layers, Steel, Carbon, Samples
Keywords:
Hot corrosion, carburization, oxidation, carbon absorption, heat resistant cast steels, carbide phase
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2012
Association for Materials Protection and Performance (AMPP)
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