Internal nitridation of nickel-base alloys. Part II. Behavior of quaternary Ni-Cr-Al-Ti alloys and computer-based description

被引：61

作者：

Krupp, U ^{[1
]}

Christ, HJ ^{[1
]}

机构：

[1] Univ Gesamthsch Siegen, Inst Werkstofftech, D-57068 Siegen, Germany

来源：

OXIDATION OF METALS | 1999年 / 52卷 / 3-4期

关键词：

internal nitridation; nitrogen diffusion; nitrogen solubility; finite-difference technique; thermodynamic equilibrium calculations;

D O I：

10.1023/A:1018895628849

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Whereas in Part I of this study the process of internal nitridation was described for binary and ternary alloys within the Ni-Cr-Al-Ti system, this part focuses on quaternary Ni-Cr-Al-Ti alloys, which are similar to commercial Ni-base alloys used in high-temperature applications regarding their chemical compositions. These alloys can simultaneously form two different nitride-precipitation zones consisting of TiN and AIN. In order to quantify the nitridation process, thermogravimetric measurements in an oxygen-free nitrogen atmosphere in the temperature range 800-1100 degrees C were carried out and supplemented by extensive microstructural studies. While single-nitride internal nitridation can easily be described by Wagner's theory of internal oxidation, modeling of the more complex internal-precipitation reactions that involves more than one nitride requires a numerical treatment of both the diffusion and the thermochemical processes in the alloy. For this purpose, a computer simulation was developed in which the commercial thermodynamic software ChemApp is combined with a finite-difference diffusion calculation. It was shown that this calculation technique can be applied successfully to quantitatively describe the internal-nitridation process of the Ni-Cr-Al-Ti model alloys used in this study.

引用

页码：299 / 320

页数：22

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