微量のHfを添加したFe-30Cr-4Al合金の高温酸化挙動

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タイトル別名
  • High-Temperature Oxidation Behavior of Fe-30Cr-4Al Alloys with Small Additions of Hafnium
  • ビリョウ ノ Hf オ テンカシタ Fe 30Cr 4Al ゴウキン ノ コウ

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説明

The oxidation behavior and mechanism of an Fe-30 mass%Cr-4 mass%Al alloy and similar alloys containing 0.06, 0.09, 0.19 and 0.38 mass%Hf were studied at temperatures between 1273 and 1573 K for times up to 79.2 ks in stagnant air by thermogravimetric method, X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The oxide formed on these alloys was mainly α-Al2O3, though the inclusion of HfO2 particles in scales increased with an increase in hafnium content in the alloy. Oxidation kinetics and scale adherence were discussed in terms of the morphological details of the scale and the structural change in the scale-alloy interface. The addition of a small amount of hafnium lowered the oxidation rate, but further hafnium addition tended to increase the oxidation rate by providing rapid diffusion paths in the form of HfO2 stringers. The scale adherence, on the contrary, showed a reverse trend, i.e., the higher the hafnium content, the stronger the adherence of scale in the experimental addition range. Metallographic evidence suggested that the improved scale adherence was due principally to a pegging mechanism; hafnium promoted the growth of stringers of α-Al2O3 into the alloy.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 50 (5), 500-506, 1986

    公益社団法人 日本金属学会

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