Effect of heat treatment on superplastic response of powder-consolidated nickel-base superalloy IN 100

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

Materials ◽

10.3390/ma8095299 ◽

2015 ◽

Vol 8 (9) ◽

pp. 6179-6194 ◽

Cited By ~ 7

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

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Effect of heat treatment on the high temperature fatigue life of single crystalline nickel base superalloy additively manufactured by means of selective electron beam melting

Scripta Materialia ◽

10.1016/j.scriptamat.2019.05.002 ◽

2019 ◽

Vol 168 ◽

pp. 124-128 ◽

Cited By ~ 8

Author(s):

Carla Meid ◽

Anne Dennstedt ◽

Markus Ramsperger ◽

Julian Pistor ◽

Benjamin Ruttert ◽

...

Keyword(s):

Heat Treatment ◽

Electron Beam ◽

High Temperature ◽

Fatigue Life ◽

Electron Beam Melting ◽

Nickel Base Superalloy ◽

High Temperature Fatigue ◽

Selective Electron Beam Melting ◽

Nickel Base ◽

Base Superalloy

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Long-Term Gamma Prime Phase Stability after Various Heat Treatment Conditions with Temperature Dropping during Solution Treatment in Cast Nickel Base Superalloy, Grade Inconel-738

Materials Science Forum ◽

10.4028/www.scientific.net/msf.891.420 ◽

2017 ◽

Vol 891 ◽

pp. 420-425

Author(s):

Sureerat Polsilapa ◽

Aimamorn Promboopha ◽

Panyawat Wangyao

Keyword(s):

Heat Treatment ◽

Turbine Blades ◽

Solution Treatment ◽

Nickel Base Superalloy ◽

Gamma Prime ◽

Nickel Based Superalloy ◽

Treatment Conditions ◽

Nickel Base ◽

Base Superalloy

Cast nickel based superalloy, Grade Inconel 738, is a material for turbine blades. Its rejuvenation heat treatment usually consist of solution treatment condition with temperature range of 1125-1205 oC for 2-6 hours. Then it is following with double aging process including primary aging at 1055oC for 1 hour and secondary aging at 845oC for 24 hours. However, the various selected temperature dropping program were performed during solution treatment to simulate the possible error of heating furnace. The maximum number of temperature dropping during solution treatment is varied from 1-3 times From all obtained results, the various temperature dropping during solution treatment conditions showed extremely the significant effect on the final rejuvenated microstructures and long-term gamma prime stability after heating at temperature of 900oC for 200 hours.

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