Investigation of a New Methodology in High Temperature Oxidation Application to Commercial Austenitic Steels

Vangeli, Pascale Sotto; Ivarsson, Bo

doi:10.4028/www.scientific.net/msf.369-372.785

Cited by 9 publications

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“…Comparing experimental NMG records with COSP's NMG simulation, the moment when a certain amount of oxide has spalled is determined and used as a starting point in the finite-difference calculation of inward oxygen and nitrogen diffusion in the metallic matrix and subsequent internal oxidation and nitridation. In another work, Vangeli et al 20,21 have used thermogravimetry in cyclic conditions as a test of adherence of oxides on austenic steels. A critical weight gain for which significant spallation occurs was determined.…”

Section: Previous Uses Of Continuous Thermogravimetry For Cyclic Condmentioning

confidence: 99%

Continuous Thermogravimetry Under Cyclic Conditions

Monceau

Poquillon

2004

Oxidation of Metals

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Section: Previous Uses Of Continuous Thermogravimetry For Cyclic Condmentioning

confidence: 99%

Continuous Thermogravimetry Under Cyclic Conditions

Monceau

Poquillon

2004

Oxidation of Metals

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“…Given the strong similarity of this alloy to 321SS/347SS the discrepancy in oxidation is unclear. Alloying Ce (0.08%wt max) used results in some changes in corrosion resistance, but needs further investigation to fully understand if that is the critical factor in this system [28,29].…”

Section: B Alloy Corrosion Analysismentioning

confidence: 99%

Materials corrosion of high temperature alloys immersed in 600C binary nitrate salt.

Kruizenga¹,

Gill²,

LaFord³

2013

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Thirteen high temperature alloys were immersion tested in a 60/40 binary nitrate salt. Samples were interval tested up to 3000 hours at 600°C with air as the ullage gas. Chemical analysis of the molten salt indicated lower nitrite concentrations present in the salt, as predicted by the equilibrium equation. Corrosion rates were generally low for all alloys. Corrosion products were identified using x-ray diffraction and electron microprobe analysis. Fe-Cr based alloys tended to form mixtures of sodium and iron oxides, while Fe-Ni/Cr alloys had similar corrosion products plus oxides of nickel and chromium. Nickel based alloys primarily formed NiO, with chromium oxides near the oxide/base alloy interface. In625 exhibited similar corrosion performance in relation to previous tests, lending confidence in comparisons between past and present experiments. HA230 exhibited internal oxidation that consisted of a nickel/chromium oxide. Alloys with significant aluminum alloying tended to exhibit superior performance, due formation of a thin alumina layer. Soluble corrosion products of chromium, molybdenum, and tungsten were also formed and are thought to be a significant factor in alloy performance.

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“…Keeping these problems in mind few authors have attempted a continuous thermogravimetry for cyclic oxidation [24][25][26][27][28][29]. Monceau and Poquillon [24] have employed equipment built by Salabura and Monceau [30] that can offer very high heating and cooling rates of 823 K/min.…”

Section: Specimen Preparationmentioning

confidence: 99%

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

Pillai

Dayal

2008

Oxid Met

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The growth and degradation of the oxide scale on modified 9Cr-1Mo ferritic steel was studied at 1123 K using a thermogravimetric balance by employing the ''transient-mass-gain method'' in conjunction with the adaptation of a cyclic-oxidation procedure. The total duration of the oxidation was 1000 h. The experiment revealed that the cracking of the scale was initiated when the average thickness was 72 lm. Spallation occurred when the average thickness was 75 lm. The rate of spallation was found to be enhanced as the scale thickens and attained a higher rate after 90 lm. The rate constants for the different stages of oxidation were found to be different. The specimen was examined by SEM, EDS and XRD. The scale morphology revealed outwardly protruded growth, a uniform adherent oxide layer and a spalled region. Four oxide phases were identified; Cr 2 O 3 , Fe 2 O 3 , (FeCr) 2 O 3 and FeCr 2 O 4 . The spall contained more (FeCr) 2 O 3 whereas the adherent scale was more FeCr 2 O 4 .

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Investigation of a New Methodology in High Temperature Oxidation Application to Commercial Austenitic Steels

Cited by 9 publications

References 0 publications

Continuous Thermogravimetry Under Cyclic Conditions

Continuous Thermogravimetry Under Cyclic Conditions

Materials corrosion of high temperature alloys immersed in 600C binary nitrate salt.

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

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