High temperature oxidation behavior of a novel Ni-Cr-W-Al-Ti superalloy

被引：41
|
作者：
Teng, Jianwei [1 ]
Gong, Xiaojuan [1 ]
Yang, Biaobiao [1 ]
Yu, Shu [1 ]
Lai, Ruilin [1 ]
Liu, Jiantao [2 ]
Li, Yunping [1 ]
机构：
[1] Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China
[2] Cent Iron & Steel Res Inst, High Temp Mat Res Inst, Beijing 100081, Peoples R China
来源：
CORROSION SCIENCE | 2022年 / 198卷
关键词：
Ni-Cr-W superalloy; Oxidation; Evaporation; Activation energy; TiO2; AIR; ALLOY;
D O I：
10.1016/j.corsci.2022.110141
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Oxidation of a novel Ni-19Cr-17W-2Al-0.5Ti superalloy was investigated in air at 800-1100 ?. In spite of the local spallation of external oxide scale after prolonged oxidation at high temperature, the alloy maintains excellent oxidation resistance. The excellent oxidation resistance is related to continuous external Ti-rich oxide covering on Cr2O3 scale, which inhibits, at least to a certain degree, the evaporation of Cr2O3. In addition, this can also be ascribed to the fine Al2O3 particles along grain boundaries of alloy matrix, which plays a key role in inhibiting the inward O diffusion and outward Cr diffusion through grain boundary.
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收藏
页数：9
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