Oxidation behaviour of selected wrought Ni-base high temperature alloys when used as flame tube material in modern blue flame oil burners

Ackermann, H.; Teneva-Kosseva, G.; Lucka, K.; Koehne, H.; Richter, Silvia; Mayer, J.

doi:10.1016/j.corsci.2007.05.021

Cited by 22 publications

(17 citation statements)

References 7 publications

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“…Within this external oxide scale, for both initial surface conditions, are entrapped particles rich in Ni and Co. This protrusion formation has been described previously [10,11] and is either developed via undercutting by oxide formation [19] or by outward alloy creep to accommodate the stress caused by the increase in volume resulting from internal oxide formation [20][21][22][23][24]. In addition, a few isolated voids were present in the external oxide for both initial surface conditions.…”

Section: Oxide Characterisationsupporting

confidence: 62%

Comparison of Chromia Growth Kinetics in a Ni-based Superalloy, with and without Shot-peening

et al. 2015

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Section: Oxide Characterisationsupporting

confidence: 62%

Comparison of Chromia Growth Kinetics in a Ni-based Superalloy, with and without Shot-peening

et al. 2015

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“…Nickel-based alloys exhibit a combination of the mechanical properties and resistances to high temperature and corrosion, and have been used extensively in the gas turbine engines, aircraft, turbine disk, blades and combustor in the aerospace industry and steam power plants (Ackermann et al, 2007;Ezugwu et al, 1996). Nickel-based alloys were known as one of the most difficultto-cut metal materials.…”

Section: Introductionmentioning

confidence: 99%

Study on surface damages caused by turning NiCr20TiAl nickel-based alloy

Zou

Chen

Huang

et al. 2009

Journal of Materials Processing Technology

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“…On alloy 601 Li [10] identified MnCr 2 O 4 spinel and on alloy 602 FeCr 2 O 4 spinel after 125 1-day oxidation cycles in air with dwell temperature 1000 8C by XRD analysis. In the present investigation, the element mappings of the samples of alloy 602 after exposure time of 50 and 500 h [7,11] gave evidence that in the first hours of oxidation MnCr 2 O 4 forms on alloy 602. But after manganese has been depleted in the bulk due to repeated spallation and oxidation iron gradually substitutes manganese in this oxide phase.…”

Section: Discussionmentioning

confidence: 90%

“…At stationary operation following typical gaseous concentrations in dry gas were measured at tube outlet: 13.3-13.87 vol% carbon dioxide, 0.8-2.7 vol% oxygen, 0.1-0.95 vol% carbon monoxide, 2-39 ppm hydro carbons as propane equivalents. For details concerning burner construction, temperature distribution and gaseous atmosphere near the inner flame tube wall measured in tangential and axial direction see [6,7]. For the metallographic analysis samples with dimensions 15 Â 15 Â 1 mm 3 and 15 Â 10 Â 1 mm 3 were cut from regions at the flame tube outlet (at 1000 8C) and the half flame tube length (at 950 8C).…”

Section: Methodsmentioning

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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Oxidation behaviour of selected wrought Ni-base high temperature alloys when used as flame tube material in modern blue flame oil burners

Cited by 22 publications

References 7 publications

Comparison of Chromia Growth Kinetics in a Ni-based Superalloy, with and without Shot-peening

Comparison of Chromia Growth Kinetics in a Ni-based Superalloy, with and without Shot-peening

Study on surface damages caused by turning NiCr20TiAl nickel-based alloy

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

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