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在1300℃空气中氧化时,不含稀土的Fe-23Cr-6Al合金的氧化皮迅速起皱,氧化皮/基体界面形成大量空洞.对于预先抛光的试样,空洞在基体表面的晶界上连成网格或分布在与夹杂和碳化物相应的位置.加0.15%La,0.15%Ce或0.60%Y的合金,氧化皮平直,与基体表面密合,其氧化皮内层的晶粒为柱状,晶粒间结合紧密.认为稀土抑制氧化初期热蚀坑的发展及减轻氧化皮在其生长应力作用下产生的蠕变变形,是稀土阻止氧化皮/基体界面形成空洞、改善氧化皮粘附性的原因.
When oxidized in air at 1300 ℃, the scale of Fe-23Cr-6Al alloy containing no rare earth rapidly creped, and a large amount of voids formed on the scale / matrix interface. For pre-polished samples, voids were connected to the grain boundaries of the matrix Into a grid or distribution in the inclusions and carbide corresponding position plus 0.15% La, 0.15% Ce or 0.60% Y alloy, the scale straight, and the substrate surface closely, the oxide layer of the inner grain of Columnar, close integration between the grains.It is believed that the rare earth inhibits the development of the initial oxidative corrosion pits and reduces the creep deformation caused by the growth stress of the oxide scale, and it is the rare earth that prevents the oxide / matrix interface from forming voids and improves the scale adhesion Sexual reasons.