HIGH-TEMPERATURE OXIDATION BEHAVIOR OF A NI-CR-AL-FE-Y ALLOY

被引：42

作者：

TAWANCY, HM

SRIDHAR, N

机构：

[1] Materials Characterization Laboratory, Metrology, Standards, and Materials Division Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 1261

来源：

OXIDATION OF METALS | 1992年 / 37卷 / 3-4期

关键词：

ALPHA-AL2O3; SCALE; ISOTHERMAL OXIDATION; NI-BASE ALLOY; SURFACE SCALE; YTTRIUM-EFFECT;

D O I：

10.1007/BF00665187

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A study was conducted to examine the isothermal oxidation behavior of a wrought Ni-Cr-Al-Fe-Y alloy in air at temperatures in the range of 950-1150-degrees-C. Oxidation kinetics were determined from weight-change measurements. Analytical electron microscopy, scanning electron microscopy, and x-ray diffraction were used to characterize the morphology, structure, and composition of the oxide scale. Overall oxidation of the alloy was found to follow parabolic kinetics. Under steady-state conditions, the oxidation reaction appeared to be controlled by diffusional transport in an adherent Y-modified alpha-Al2O3 scale with an activation energy of about 400 KJ/mol. Yttrium was found to preferentially segregate to grain boundaries of alpha-Al2O3 which maintained a fine columnar grain structure about 0.05-0.2-mu-m in size. Based upon the results obtained, it was suggested that the role of Y was to promote the formation of a thin layer of alpha-Al2O3 with improved mechanical strength.

引用

页码：143 / 166

页数：24

共 37 条

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