INFLUENCE OF YTTRIUM ADDITIONS ON OXIDE-SCALE ADHESION TO AN IRON-CHROMIUM-ALUMINUM ALLOY
INFLUENCE OF YTTRIUM ADDITIONS ON OXIDE-SCALE ADHESION TO AN IRON-CHROMIUM-ALUMINUM ALLOY
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DOI：
10.1007/bf00612158
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发表时间：
1976-01-01
影响因子：
2.2
通讯作者：
WOOD, GC
中科院分区：
文献类型：
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作者：
GOLIGHTLY, FA;STOTT, FH;WOOD, GC
本文研究了Fe-27%Cr-4%Al合金及含0.023%和0.82%Y的类似合金在1200°C下于1atm氧气中的氧化行为。在不含钇的合金上形成的氧化物形成了高度回旋的结构，显然是由于氧化物的横向生长。后者导致氧化物在高温下从合金中脱离，并在冷却过程中大量剥落。据推测，横向生长的结果从现有的氧化物层内的氧化物的形成，通过反应之间的氧扩散向内向下的氧化物晶界和铝扩散向外通过大块氧化物。添加钇到合金中显然防止氧化物层内氧化物的形成，氧化物形成反应发生在合金-氧化物界面。因此，防止了横向生长，并且在冷却期间不会发生剥落。向合金中添加0.82%的Y所赋予的第二个优点是防止在合金-氧化物界面处形成空隙，避免在氧化期间合金晶粒生长，以及产生氧化物“键合”或“钉扎”效应。
The oxidation behavior of an Fe-27%Cr-4%Al alloy and similar alloys containing 0.023% and 0.82% Y in 1 atm oxygen at 1200°C has been examined. The oxide formed on the yttrium-free alloy develops a highly convoluted configuration, apparently resulting from lateral growth of the oxide. The latter leads to oxide detachment from the alloy at temperature and extensive spalling during cooling. It is postulated that lateral growth results from the formation of oxide within the existing oxide layer by reaction between oxygen diffusing inward down the oxide grain boundaries and aluminum diffusing outward through the bulk oxide. Additions of yttrium to the alloy apparently prevent the formation of oxide within the oxide layer, the oxide-forming reaction occurring as the alloy-oxide interface. Thus lateral growth is prevented and spalling during cooling does not occur. Secondary advantages conferred by the addition of 0.82% Y to the alloy are the prevention of void formation at the alloy-oxide interface, the avoidance of alloy grain growth during oxidation, and the creation of an oxide “keying” or “pegging” effect.