The effect of microstructure and temperature on the oxidation behavior of two-phase Cr-Cr2X (X=Nb,Ta) alloys

被引：0

作者：

Brady, MP ^{[1
]}

Tortorelli, PF ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA

来源：

HIGH TEMPERATURE CORROSION AND MATERIALS CHEMISTRY, PROCEEDINGS | 1998年 / 98卷 / 09期

关键词：

D O I：

暂无

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The oxidation behavior of Cr(X) solid solution (Cr-ss) and Cr2X Laves phases (X=Nb;Ta) was studied individually and in combination at 950-1100 degrees C in air. The Cr-ss phase was significantly more oxidation resistant than the Cr2X Laves phase. At 950 degrees C, two-phase alloys of Cr-Cr2Nb and Cr-Cr2Ta exhibited "in-situ" internal oxidation, in which remnants of the Cr2X Laves phase were incorporated into a growing chromia scale. At 1100 degrees C, the Cr-Cr2Nb alloys continued to exhibit in-situ internal oxidation, which resulted in extensive O/N penetration into the alloy ahead of the alloy-scale interface and catastrophic failure during cyclic oxidation. In contrast, the Cr-Cr2Ta alloys exhibited a transition to selective Cr oxidation and the formation of a continuous chromia scale. The oxidation mechanism is interpreted in terms of multiphase oxidation theory.

引用

页码：466 / 476

页数：11