Effect of Molybdenum on the High-Temperature Oxidation and the Vanadium-Attack on Ni-Cr-Base Alloys

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  • Imai Yûnoshin
    The Research Institute for Iron, Steel and Other Metals, Tôhoku University
  • Nishi Yoshizumi
    1st Research Center, The Technical Research and Development Institute, Defence Agency

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Other Title
  • Ni-Cr基合金の高温酸化ならびにバナジウム・アタックにおよぼすMoの影響
  • Ni-Crキ ゴウキン ノ コウオン サンカ ナラビニ バナジウム アタック ニ オヨボス Mo ノ エイキョウ

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Abstract

The oxidation behavior and the vanadium-attack of Ni-Cr-Mo, Ni-Cr-Co-Mo alloys and some practical heat-resisting alloys containing molybdenum were studied. The following results were obtained. (1) Molybdenum increased the weight loss in scaling on Ni-Cr alloys above 1,000°C. On Ni-Cr-Mo alloys, MoO3 valatilized from surface of the scale above 1,200°C, and the rapid conversion of the metal into oxide was observed at the temperature of 1,350°C, owing to the formation of fused phase in the scale. The temperature of oxidation-resistance limit of Ni-Cr-Mo alloys is probably above, 1,350°C. (2) The temperature of oxidation-resistance limit was lowered, as the ratio of cobalt to nickel in alloys was raised, in Ni-Cr-Co-Mo alloy, Ni-base and Co-base heat-resisting alloys containing molybdenum. (3) Molybdenum increased the corrosion rate by V2O5 attack on Ni-Cr and Ni-Cr-Co alloys. In commercial heat-resisting alloys, molybdenum increased the corrosion rate, too. In Fe-base, Co-base an Ni-base alloys containing molybdenum, the corrosion rate was the lowest on Ni-base alloys.

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