scholarly journals Effect of Heat Treatment Process on Microstructure and Fatigue Behavior of a Nickel-Base Superalloy

Materials ◽  
2015 ◽  
Vol 8 (9) ◽  
pp. 6179-6194 ◽  
Author(s):  
Peng Zhang ◽  
Qiang Zhu ◽  
Gang Chen ◽  
Heyong Qin ◽  
Chuanjie Wang
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Fatigue Behavior ◽  
Nickel Base Superalloy ◽  
Heat Treatment Process ◽  
Nickel Base ◽  
Base Superalloy

Microstructure and Recrystallization Behavior of an as-Extruded PM Nickel-Base Superalloy

2012 ◽  
Vol 217-219 ◽  
pp. 2038-2041
Author(s):  
Min Cong Zhang ◽  
Shu Yun Wang ◽  
Jin Dong Li
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Nickel Base Superalloy ◽  
Heat Treatment Process ◽  
Recrystallization Behavior ◽  
Different Types ◽  
Nickel Base ◽  
Average Size ◽  
Equiaxed Grains ◽  
Base Superalloy

The powder metallurgy (PM) nickel-base superalloy GH720 was extruded at 1100°C and the as-extruded samples were treated at 1110°C during 10min, 20min and 30min apart. The microstructure and recrystallization behavior of as-extruded alloy GH720 were discussed. The results indicate that there are two different types of γ' phases: primary γ' phase is mainly distributed on the grain boundary with an average size ranging from 0.3 to 0.5μm and dissolves partially at 1110°C during 30min, whereas the secondary γ' phase is distributed inside the grains with an average size of 50nm and dissolves largely at 1110°C during 30min. Recrystallization mechanism is subgrain nucleation when as-extruded GH720 is treated at 1110°C at which a lot of γ' phase exist. γ' phase inhibits growth of recrystallized grain availably and the uniform, fine and equiaxed grains in GH720 were formed during the extrusion and following heat treatment process.

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.

scholarly journals Effect of Salt Coatings on Low Cycle Fatigue Behavior of Nickel -base Superalloy GTM-SU-718

2013 ◽  
Vol 55 ◽  
pp. 830-834 ◽  
Author(s):  
G.S. Mahobia ◽  
R.G. Sudhakar ◽  
Ajesh Antony ◽  
K. Chattopadhyay ◽  
N.C. Santhi Srinivas ◽  
...  
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Nickel Base Superalloy ◽  
Cycle Fatigue ◽  
Nickel Base ◽  
Base Superalloy
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