Evaluation of High-Temperature Oxidation Behavior of Inconel 600 and Hastelloy C-22

Ammar Abdulkareem Hashim; Ali Sabea Hammood; Nawal Jasem Hammadi

doi:10.1007/s13369-015-1766-y

What is it about?

The aim of this study was to investigate the oxidation behavior of nickel-base superalloys (Inconel 600 and Hastelloy C-22) by the determination of the oxidation rates of alloys at elevated temperatures and at ambient air. The cyclic oxidation method was adapted by heating of alloys periodically in still air at 900, 1000 and 1100◦C followed by cooling at ambient temperature. The weight change measurement was recorded during the cyclic oxidation tests. The X-ray diffraction and microstructure study were also used as characterization methods to illustrate the properties of studied alloys and oxide film that formed on the surface of oxidized alloys. Inconel 600 and Hastelloy C-22 showed their ability to develop a uniform protective oxide film. The oxide film that formed on both alloys was chromia oxide Cr2O3 with smaller amount of spinel oxide NiCr2O4. The results of the weight gain measurements suggest that the oxidation kinetics of both alloys follows the parabolic behavior during the experimental tests. Also both alloys at 1100◦C exhibited severe spallation of oxide film with linear decreasing in the weight change measurements. The p-kp model was implemented to describe the subsequent cyclic process of oxide growth and spalling.

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Why is it important?

The results of the weight gain measurements suggest that the oxidation kinetics of both alloys follows the parabolic behavior during the experimental tests. Also, both alloys at 1100∘C exhibited severe spallation of an oxide film with linear decreasing in the weight change measurements. The p-kp model was implemented to describe the subsequent cyclic process of oxide growth and spalling.

Perspectives

The purpose of this work was to study the oxidation behavior of Inconel 600 and Hastelloy C-22 at high temperatures throughout the determination of oxidation rates at ambient air, and then, p-kp model was used to predict the oxidation resistance of alloys on the basis of the obtained experimental data.
Prof. Dr Eng. Ali Sabea Hammood
University of Kufa -Faculty of Engineering -Materials Engineering Department

This page is a summary of: Evaluation of High-Temperature Oxidation Behavior of Inconel 600 and Hastelloy C-22, Arabian Journal for Science and Engineering, June 2015, Springer Science + Business Media,
DOI: 10.1007/s13369-015-1766-y.
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Evaluation of High-Temperature Oxidation Behavior of Inconel 600 and Hastelloy C-22
1. Inconel 600 and Hastelloy C-22 showed a good tendency to develop a uniform chromia oxide scale coated the outer surfaces from the initial cycles of the high-temperature oxidation and at different temperatures. Smaller amounts of spinel oxides were also observed. 2. The oxidation kinetics of both alloys followed nearly the parabolic behavior during oxide formation. 3. The oxide films for both alloys suffered severe spallation at 1100 ◦C and confirmed that chromia oxide had no ability to work above 1000 ◦C. The extent of spalling increased with increasing exposure temperature. 4. The p-kp model was successfully adapted to cyclic oxidation data obtained for Inconel 600 and Hastelloy C-22 describing the process of oxide growth and spallation. The model was used to make simplified lifetime predictions. 5. Prolonged exposure period of time for oxidation, the weight of the specimens could be approximated as decreasing linearly with time and the adherent oxide mass approached a constant value, as confirmed by the model. 6. The p-kp oxidation life map was plotted; the results data clearly demonstrated that Hastelloy C-22 had features of better cyclic oxidation resistance.

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Prof. Dr Eng. Ali Sabea Hammood
University of Kufa -Faculty of Engineering -Materials Engineering Department

Evaluation of High-Temperature Oxidation Behavior of Inconel 600 and Hastelloy C-22

What is it about?

Why is it important?

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