The Effect of Tungsten Addition on Steam Oxidation Behavior of the Fe-20Cr-35Ni (at％) Alloy at 1073 K

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  • Ogawahara Kaito
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Ueda Mitsutoshi
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

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  • 1073 KにおけるFe-20Cr-35Ni (at％)合金の水蒸気酸化挙動に及ぼすW添加の影響

Abstract

<p>This paper focuses on the effect of tungsten addition on the steam oxidation behavior of the Fe-20Cr-35Ni (at％) alloy at 1073 K. Steam oxidation tests of the W added Fe-20Cr-35Ni (at％) alloy were carried out at 1073 K in an Ar-15％H2O gas mixture for up to 604.8 ks. The oxidation resistance of the alloys was improved by adding W into the alloy. There are two effects of W on the steam oxidation behavior: the effect of solid solution and the effect of precipitation. Tungsten in the alloy is enriched as a Ni-W alloy in the matrix of the internal oxidation zone (IOZ) during oxidation. The Ni-W alloy in the IOZ may act as a diffusion barrier for oxygen and promote a continuous Cr2O3 layer. On the other hand, Fe2W precipitated in the alloy decomposes during oxidation and provides alloying elements for forming FeCr2O4 and CrWO4 in the IOZ, resulting in a continuous Cr2O3 layer formation.</p>

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