The solidification microstructures and microsegregation behaviour of a nickel-base superalloy under ultra-high temperature gradient conditions produced by a laser beam

1996 ◽  
Vol 15 (24) ◽  
Author(s):  
Q.Y. Pan ◽  
W.D. Huang ◽  
Y.M. Li ◽  
X. Lin ◽  
Y.H. Zhou
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Laser Beam ◽  
Nickel Base Superalloy ◽  
High Temperature Gradient ◽  
Nickel Base ◽  
Solidification Microstructures ◽  
Base Superalloy ◽  
Ultra High Temperature

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

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.

Evaluation of Multicomponent Nickel Base LI2 and Other Intermetallic Alloys as High Temperature Structural Materials

1986 ◽  
Vol 81 ◽  
Author(s):  
D. M. Shah ◽  
D. N. Duhl
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Impact Resistance ◽  
High Strength ◽  
Structural Materials ◽  
Nickel Base Superalloy ◽  
Intermetallic Alloys ◽  
Nickel Base ◽  
Base Superalloy

AbstractMulticomponent nickel base intermetallics with the L12 structure were evaluated as high temperature structural materials. The compounds were based on the γ' composition of PWA 1480, a high strength single crystal nickel base superalloy. The best balance of properties in the compound was achieved with <111> oriented single crystals but no significant advantage could be demonstrated over the precipitation hardened superalloys. Insufficient impact resistance was a major deficiency of the L12 compounds. Other nickel base intermetallics were also evaluated but showed little advantage over superalloys.

High temperature elastic properties of polycrystalline mar-m200 (a nickel base superalloy)

1981 ◽  
Vol 12 (5) ◽  
pp. 801-803 ◽  
Author(s):  
D. P. Dandekar ◽  
A. G. Martin ◽  
J. V. Kelley
Keyword(s):  
High Temperature ◽  
Elastic Properties ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy
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