View in EDS

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys.

Saved in:
Bibliographic Details
Title: Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys.
Authors: Dudziak, T.1 tomasz.dudziak@iod.krakow.pl, Deodeshmukh, V.2, Backert, L.3, Sobczak, N.1, Witkowska, M.4, Ratuszek, W.4, Chruściel, K.4, Zieliński, A.5, Sobczak, J.1, Bruzda, G.1
Source: Oxidation of Metals. Feb2017, Vol. 87 Issue 1/2, p139-158. 20p.
Subjects: Nickel alloys, Austenitic stainless steel, Spalling wear, Oxidation kinetics, High temperature chemistry
Abstract: The aim of this study was to investigate phase formation under steam oxidation conditions and steam oxidation behaviours of two solid-solution-strengthened alloys-HAYNES 230 and 617 alloy-two gamma-prime (γ′)-strengthened alloys-263 and HAYNES 282-and finally three austenitic steels rich in Cr-309S, 310S and HR3C. The samples were tested under 1 bar pressure in 100 % water-steam-water system at 800 °C for 1000 h. It was found that Ni-based solid-solution-strengthened alloys, HAYNES 230 and 617 alloy, developed mainly CrO and MnCrO phases on their surfaces, whereas the γ′-strengthened alloys, 263 and HAYNES 282, formed CrO, TiO and MnTiO phases, indicating slightly higher corrosion degradation rate. The austenitic steels exposed for 1000 h formed CrO, FeO and MnCrO with traces of Fe,Mn(SiO). Some sites on the austenitic steel surfaces were enriched with FeO with little amount of Cr. During the test, no spallation of the external oxide scale was observed. The kinetic data showed that only the 263 alloy oxidized according to parabolic behaviour, whereas the other alloys deviated from the parabolic rate law, with time exponents of 0.4-0.6 or 0.3. Finally, cross-sectioned investigations of the exposed samples revealed that Ni-based alloys underwent extended internal oxidation, with the highest extent in HAYNES 282 reaching 25 μm and the lowest in HAYNES 230 alloy reaching 7 μm. The austenitic steels showed no internal oxidation phenomena. [ABSTRACT FROM AUTHOR]
Copyright of Oxidation of Metals is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:The aim of this study was to investigate phase formation under steam oxidation conditions and steam oxidation behaviours of two solid-solution-strengthened alloys-HAYNES 230 and 617 alloy-two gamma-prime (γ′)-strengthened alloys-263 and HAYNES 282-and finally three austenitic steels rich in Cr-309S, 310S and HR3C. The samples were tested under 1 bar pressure in 100 % water-steam-water system at 800 °C for 1000 h. It was found that Ni-based solid-solution-strengthened alloys, HAYNES 230 and 617 alloy, developed mainly CrO and MnCrO phases on their surfaces, whereas the γ′-strengthened alloys, 263 and HAYNES 282, formed CrO, TiO and MnTiO phases, indicating slightly higher corrosion degradation rate. The austenitic steels exposed for 1000 h formed CrO, FeO and MnCrO with traces of Fe,Mn(SiO). Some sites on the austenitic steel surfaces were enriched with FeO with little amount of Cr. During the test, no spallation of the external oxide scale was observed. The kinetic data showed that only the 263 alloy oxidized according to parabolic behaviour, whereas the other alloys deviated from the parabolic rate law, with time exponents of 0.4-0.6 or 0.3. Finally, cross-sectioned investigations of the exposed samples revealed that Ni-based alloys underwent extended internal oxidation, with the highest extent in HAYNES 282 reaching 25 μm and the lowest in HAYNES 230 alloy reaching 7 μm. The austenitic steels showed no internal oxidation phenomena. [ABSTRACT FROM AUTHOR]
ISSN:0030770X
DOI:10.1007/s11085-016-9662-8