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| INFLUENCE OF RE ADDITION ON GRAIN GROWTH OFα-Al_2O_3 LAYER ON Fe-Cr-Al ALLOY |
| by LIBei; YAN Yuxin (Baotou Research Institute of Metallurgy; Nei Monggol)(Manuscript received 1 July; 1980; revised manuscript 1 August; 1983) |
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Cite this article:
by LIBei; YAN Yuxin (Baotou Research Institute of Metallurgy; Nei Monggol)(Manuscript received 1 July; 1980; revised manuscript 1 August; 1983). INFLUENCE OF RE ADDITION ON GRAIN GROWTH OFα-Al_2O_3 LAYER ON Fe-Cr-Al ALLOY. Acta Metall Sin, 1984, 20(2): 143-220.
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Abstract When the Fe-23Cr-6Al alloy is under oxidation at 1300℃, the α-Al_2O_3 grains of single layer are formed initially as columnar crystals, and then, their columnar feature degenerated progressively owing to the columnar grains growing along transverse direction and the development of outer layer oxide consisted of equiaxial crystals. If the RE added, the growth rate of columnar grain along longitudinal direction is increased and along transverse direction decreased, as well as the growth rate of equiaxial grain of outer layer oxide also decreased. Consequently, their columnar feature become more intensive. For the alloy without RE, more crystalline whiskers and fine crystals are found on the surface of oxide layer. It may be considered that the Al ions diffusion through α-Al_2O_3 layer outwards is prevented by RE addition, and the oxide layer adherence is then improved.
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Received: 18 February 1984
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