Abstract
In high temperature applications, the alumina forming austenites (AFA) have recently gained more focus. These utilise the advantageous effect of Al on oxidation resistance, and also have good mechanical properties. Two experimental alloys [20Cr–25Ni–1Mn–0.5Si–Fe (wt.%)] were prepared. To one of the alloys 3.77 wt.% Al was added. The alloys were studied in air and air/water at 700 °C and 1,000 °C, in a sulphidising/chlorinating environment at 700 °C and in a nitriding atmosphere at 1,000 °C. The time of exposure was 100 h, except for one 1,000 h exposure in air/water. At 700 °C in air and air/water, the AFA displayed lower mass gain than the reference material. After exposure in the sulphidising-chlorinating environment, the material displayed a surface alumina layer with some spallation. In air or air/water at 1,000 °C, internal aluminium nitride and alumina formation occurred, appreciably reducing the sound metal thickness. The nitridation was enhanced in the nitriding environment.
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Acknowledgments
This work was performed within the member programme IM-Tema 2 of Swerea KIMAB, and the support of Outokumpu Stainless AB, Sandvik Heating Technology AB and Sandvik Materials Technology AB is gratefully acknowledged. Also, the company representatives, Nicklas Folkeson, Thomas Helander, Mats Lundberg and Pascale Vangeli are thanked for valuable discussions during the project. Núria Fuertes is acknowledged for the hardness measurements, Thomas Helander is thanked for the equilibrium calculations using NiFe super database, Fredrik Lindberg for the FIB/EDS measurements and Mats Randelius for performing the GDOES analyses.
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Elger, R., Pettersson, R. Effect of Addition of 4 % Al on the High Temperature Oxidation and Nitridation of a 20Cr–25Ni Austenitic Stainless Steel. Oxid Met 82, 469–490 (2014). https://doi.org/10.1007/s11085-014-9503-6
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DOI: https://doi.org/10.1007/s11085-014-9503-6