Isothermal Oxidation Behavior of Ni Base Superalloy DM02 for High Temperature Dies

Abstract:

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The isothermal oxidation behavior of a new developed Ni base superalloy named DM02 for high temperature dies was studied in this paper. The dynamic curve was achieved by monitoring weight gain of the alloy as a function of time. The results showed that the alloy had fairly good oxidation resistance at 1050°C and 1100°C. The oxidation kinetics at both 1050°C and 1100°C followed parabolic rules in segment. It has been found that the oxidation of the alloy was controlled by multi-oxides of (Ni, Co)O, (Ni, Co)Al2O4, and NiWO4, growth mechanism in the primary stage, and by Al2O3, NiAl2O4 growth mechanism in the following stage. After oxidation at 1050°C for 100h, the oxide scale of the alloy was mainly composed of two areas. Some were thin uniform (Ni, Co)Al2O4(outer)/Al2O3 (inner) composites scale and others were multi-layer oxide scale of ( Ni,Co)O / multi-oxides (mainly NiWO4、NiO and NiAl2O4.) /Al2O3.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

1253-1256

DOI:

10.4028/www.scientific.net/MSF.546-549.1253

Citation:

Q. Li et al., "Isothermal Oxidation Behavior of Ni Base Superalloy DM02 for High Temperature Dies", Materials Science Forum, Vols. 546-549, pp. 1253-1256, 2007

Online since:

May 2007

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Price:

$35.00

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