Oxidation behaviour of Ni–Cr based alloy containing Si during high temperature application in an oil burner

Ackermann, H.; Teneva-Kosseva, G.; Lucka, K.; Köhne, Heinrich; Richter, Sandra

doi:10.1179/174327809x397811

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Uniform Cr concentration profiles were previously measured by Ackermann et al 36,39,47 in alloy 602 CA after high temperature exposure in simulated gas burner atmospheres. A similar effect has been found by Li and Gleeson 51 in the Ni-Cr-Si system.…”

Section: Chromium Depletion Profilesmentioning

confidence: 83%

“…The activation energy for the IOZ rate constant k (i) p is 213 kJ mol 21 . The k (i) p values for alloy 602 CA are compared with those for binary Ni-2?5Al alloys 34,35 measured in a Rhines pack, k (i) p values for alloy 601, a similar chromia forming Ni base alloy with lower (1?0-1?7 wt-%) aluminium content, [36][37][38] and for the alloy under investigation 39 and other chromia forming Ni base alloys which contain 2-3 wt-% aluminium. 20,40 The concentration profiles of aluminium and chromium in the subscale zone measured by EDX are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Modelling compositional changes in nickel base alloy 602 CA during high temperature oxidation

Chyrkin

Sloof

Pillai

et al. 2015

Materials at High Temperatures

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The high chromium nickel base alloy 602 CA is used as construction material for high temperature components in aggressive environments such as gas burners or heat exchangers. The high temperature oxidation behaviour of this alloy is characterised by the formation of an external Cr 2 O 3 scale and internal precipitation of alumina. The main goal of the present investigation was to elucidate the effect of aluminum on the subscale chromium depletion phenomena. The chromium concentration profiles were found to be flat and sometimes even increasing towards the oxide-alloy interface. The experimental observations were interpreted in terms of alloy thermodynamics, i.e. effect of oxidation induced compositional changes on chemical potentials of the alloy constituents. The concentration profiles in alloy 602 CA observed during high temperature exposure were modelled using the CALPHAD approach for thermodynamic and kinetic calculations. Thermodynamic calculations revealed that the Al depletion in the alloy subsurface due to internal alumina precipitation leads to enhanced Cr diffusion towards the alloy surface.

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Section: Chromium Depletion Profilesmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Modelling compositional changes in nickel base alloy 602 CA during high temperature oxidation

Chyrkin

Sloof

Pillai

et al. 2015

Materials at High Temperatures

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“…During operation it is exposed to high temperatures (up to 920 8C [1]) and rapid changes of temperature and gaseous atmosphere during beginning and ending of the burner operation. Furthermore, the inner side of the tube is in close contact to the combustion flame, while the outer surface is exposed to the exhaust gas, which is recirculated back to the burner.…”

Section: Introductionmentioning

confidence: 99%

Oxide scale formation on Al containing Ni–Cr‐based high temperature alloys during application as flame tube material in recirculation oil burners

Ackermann

Teneva-Kosseva

Köhne

et al. 2008

Materials & Corrosion

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The flame tube is an important functional component of burners using the concept of the flame tube stabilised combustion. Under typical combustion conditions the material of the flame tube is exposed to high temperatures (≥900 °C) and to corrosion attack by the combustion gases. Furthermore as the burners are generally operated intermittently, the material suffers from extreme temperature and atmosphere changes. For flame tubes, a lifetime of approximately 8000 h is desired. Predominantly metallic high temperature materials are used. The scope of the present work was to test—under application conditions and for maximum material temperatures exceeding 900 °C—alternative high temperature alloys for use as tube material. The corrosion resistance of the austenitic Ni–Cr‐based alloys (601, 602 CA, 617 and 693) has been investigated in a burner rig at maximum material temperatures of 950 and 1000 °C and with exposure times from 50 to 3000 h. The chromium content of the alloys was between 20 and 30 wt% and that of aluminium between 1 and 3.4 wt%. Metallographic cross‐sections of samples of the alloys were analysed by electron microprobe yielding information about the microstructure and composition of the oxides in the surface zone and variations during exposure time. This study focuses on the observed specific effects of the alloying element aluminium on the development of the oxide scale and on the lifetime of the alloys. At the alloy surface after 500 h exposure time a chromium oxide scale had formed with aluminium oxides underneath predominantly along grain boundaries. For the alloys with the lower aluminium content, the aluminium oxides built up an open network but not a closed layer. For the alloy with the highest aluminium content (alloy 693) after 50 h two different characteristic microstructures at the surface were found. In one case, the grains at the surface were covered with chromium oxide on top and the remaining grain surface was completely enclosed by aluminium oxides. In the other case, the aluminium oxide formed a thin layer directly below the chromium oxide scale. After 500 h exposure time, a significantly thinner chromium oxide scale and massive internal chromium oxides were observed. Catastrophic corrosion, formation of internal oxides and aluminium nitrides started even after 500 h. It will be demonstrated that the early breakdown of alloy 693 is linked to the aluminium oxides which act as a barrier constricting the diffusion of chromium from the alloy matrix towards the surface. Under the conditions of extreme temperature changes given in the burner the aluminium oxide layer on its part did not provide corrosion protection.

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Ellingham diagram: A new look at an old tool

Epifano

Monceau

2023

Corrosion Science

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Oxidation behaviour of Ni–Cr based alloy containing Si during high temperature application in an oil burner

Cited by 3 publications

References 13 publications

Modelling compositional changes in nickel base alloy 602 CA during high temperature oxidation

Modelling compositional changes in nickel base alloy 602 CA during high temperature oxidation

Oxide scale formation on Al containing Ni–Cr‐based high temperature alloys during application as flame tube material in recirculation oil burners

Ellingham diagram: A new look at an old tool

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