High-temperature oxidation of a nickel base superalloy at different oxygen partial pressures

The effects of Aluminum addition on the oxidation behavior of CM-247LC Nickel base superalloy were investigated under high temperature isothermal oxidation test at 1000°C in the dry air. In this study, we explored the difference and observed the micro-structure of oxides, gamma matrix as well as gamma prime precipitate, and further studied the impact of high temperature oxidation behavior and phase stability analysis. Results showed that by adding small amount of Al in CM-247LC superalloy, protective oxides could form more easily, and a more regular morphology of gamma prime in the base material microstructure could be retained, which in-directly reduced the rate of outward diffusion and prevented further oxidation.

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Boron Depletion in a Nickel Base Superalloy Induced by High Temperature Oxidation

Oxidation of Metals ◽

10.1007/s11085-015-9529-4 ◽

2015 ◽

Vol 83 (3-4) ◽

pp. 393-413 ◽

Cited By ~ 17

Author(s):

A. Jalowicka ◽

W. Nowak ◽

D. J. Young ◽

V. Nischwitz ◽

D. Naumenko ◽

...

Keyword(s):

High Temperature ◽

High Temperature Oxidation ◽

Nickel Base Superalloy ◽

Temperature Oxidation ◽

Nickel Base ◽

Base Superalloy

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OXIDATION RESISTANCE OF LOW-TEMPERATURE PACK ALUMINIZING COATINGS ON NI-BASE SUPERALLOY

International Journal of Modern Physics B ◽

10.1142/s021797921006629x ◽

2010 ◽

Vol 24 (15n16) ◽

pp. 3185-3189 ◽

Cited By ~ 2

Author(s):

BIFEI YUAN ◽

LONGWEN YU ◽

GUIWU LU

Keyword(s):

High Temperature ◽

Low Temperature ◽

Oxidation Resistance ◽

High Temperature Oxidation ◽

Aluminide Coating ◽

Nickel Base Superalloy ◽

Temperature Oxidation ◽

Pack Aluminizing ◽

Nickel Base ◽

Base Superalloy

A nickel-base superalloy has been used to deposit the aluminide coating by low-temperature pack cementation process. The high temperature oxidation tests on aluminized alloys and the uncoated specimens are carried out at 1000°C for 10h. It is observed that a dense and protective Al 2 O 3 surface layer is produced on the aluminized alloy, and the aluminizing process has greatly enhanced the high temperature oxidation resistance of the Ni -base superalloy at 1000°C. As a contrast, the uncoated specimen begins to be failure when treated only for 6h at the same temperature.

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Microstructural Characterisation of High Temperature Oxidation of Nickel Base Superalloy RR1000 and the Effect of Shot-peening

10.7449/2012/superalloys_2012_751_758 ◽

2012 ◽

Cited By ~ 1

Author(s):

S. Cruchley ◽

M. Taylor ◽

H. Evans ◽

P. Bowen ◽

M. Hardy ◽

...

Keyword(s):

High Temperature ◽

Shot Peening ◽

High Temperature Oxidation ◽

Nickel Base Superalloy ◽

Temperature Oxidation ◽

Microstructural Characterisation ◽

Nickel Base ◽

Base Superalloy

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Effect of Pre-Weld Heat Treatment Temperatures on TIG Welded Microstructures on Nickel Base Superalloy, GTD-111

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.658.14 ◽

2015 ◽

Vol 658 ◽

pp. 14-18

Author(s):

Tanaporn Rojhirunsakool ◽

Duangkwan Thongpian ◽

Nutthita Chuankrerkkul ◽

Panyawat Wangyao

Keyword(s):

Heat Treatment ◽

High Temperature ◽

Heat Treatment Temperature ◽

Treatment Temperature ◽

Tig Welding ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Base Superalloy ◽

Weld Heat

Nickel-base superalloys have been used as high temperature materials in land-base gas turbine application. When subjected to long term, high temperature service, large crack propagation was observed. Typical refurbishment method of these turbines is carried out by using TIG welding followed by post-weld standard heat treatment. However, new crack initiation is found in the heat-affected zone after TIG welding. Pre-weld heat treatment has been discovered to improves final γ + γ’ microstructure. This study focuses on the effect of pre-weld heat treatment temperature on final γ + γ’ microstructure. Seven different conditions of pre-weld heat treatment temperature were investigated. Scanning electron microscopy studies were carried out after pre-weld and post-weld heat treatments to compare the γ + γ’ microstructure and capture microcracks. The best pre-weld heat treatment temperature produces uniform distribution of finely dispersed γ’ precipitates in the γ matrix without post-weld crack.

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