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

Tanaporn Rojhirunsakool; Duangkwan Thongpian; Nutthita Chuankrerkkul; Panyawat Wangyao

doi:10.4028/www.scientific.net/KEM.658.14

Paper Titles

Preface, Scientific Committee, Organizers and Sponsors

Development of Forming Processes for MoNiCr Alloy
p.3

Effect of Alloying Modification in Arc Melted Hastelloy X on Microstructures and Oxidation Resistance at Elevated Temperatures
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Effect of Pre-Weld Heat Treatment Temperatures on TIG Welded Microstructures on Nickel Base Superalloy, GTD-111
p.14

Effect of Thermal Exposure on Long-Term Heated Microstructures at 900°C of Nickel Base Superalloy Turbine Blade, Grade Inconel 738
p.19

Effect of Thermal Exposure on Long-Term Heated Microstructures at 900°C of Nickel Base Superalloy Turbine Blades, Grade Udimet 500
p.25

Effects of Isothermal Aging on Microstructure Evolution of Biomedical Co-Cr-Mo Alloy
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Direct Observation of Liquation in Ni-Base Superalloy by Using Confocal Laser Scanning Microscopy
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Atmospheric Corrosion Behavior Assessment of Carbon Steel Pipes Using Cyclic Salt Spray Test
p.42

HomeKey Engineering MaterialsKey Engineering Materials Vol. 658Effect of Pre-Weld Heat Treatment Temperatures on...

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

Abstract:

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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Periodical:

Key Engineering Materials (Volume 658)

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14-18

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.658.14

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Online since:

July 2015

Authors:

Tanaporn Rojhirunsakool, Duangkwan Thongpian, Nutthita Chuankrerkkul, Panyawat Wangyao*

Keywords:

Gamma Prime, Pre-Weld Heat Treatment, Superalloys, TIG Welding

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