Effect of two-step heating transient liquid phase bonding on microstructure and mechanical behaviour of IN-738LC gas turbine components

The long isothermal solidification and homogenization time is the major concern in repairing turbine parts by the conventional transient liquid phase method. In this study, microstructure and morphology of the proposed two-step heating transient liquid phase joints were compared to results of the co...

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Published in:Proceedings of the Institution of Mechanical Engineers. Part L, Journal of materials, design and applications Journal of materials, design and applications, 2023-05, Vol.237 (5), p.1071-1081
Main Authors: Amirkhani, Alireza, Shirvani, Kourosh, Beidokhti, Behrooz, Rahimipour, Mohammad R
Format: Article
Language:English
Subjects:
Dimpling
Ductile fracture
Fracture surfaces
Gas turbines
Heating
Liquid phases
Mechanical properties
Microstructure
Precipitates
Service life
Shear strength
Solidification
Superalloys
Transient liquid phase bonding
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cited_by cdi_FETCH-LOGICAL-c312t-a19bbf1b7014a0a8aad02db0d39c6174510c4abe20749d03aab65c3dfb45999e3
cites cdi_FETCH-LOGICAL-c312t-a19bbf1b7014a0a8aad02db0d39c6174510c4abe20749d03aab65c3dfb45999e3
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container_issue 5
container_start_page 1071
container_title Proceedings of the Institution of Mechanical Engineers. Part L, Journal of materials, design and applications
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creator Amirkhani, Alireza
Shirvani, Kourosh
Beidokhti, Behrooz
Rahimipour, Mohammad R
description The long isothermal solidification and homogenization time is the major concern in repairing turbine parts by the conventional transient liquid phase method. In this study, microstructure and morphology of the proposed two-step heating transient liquid phase joints were compared to results of the conventional ones conducted at the same temperature. After the isothermal solidification, deleterious precipitates such as Ni3Si, Ni3B and CrB were removed. The application of the two-step technique increased the shear strength of the joints up to 28% (516–674 MPa) due to collision of two non-planar interfaces and formation of the longer bonding line. The shear fracture surfaces of all bonds with the complete isothermal solidification stage represent a dimple pattern that is characterized by ductile fracture. The stress-rupture life of the joint at 982 °C was about 85% of the superalloy service life at this temperature.
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source SAGE IMechE Complete Collection; Sage Journals Online
subjects Dimpling
Ductile fracture
Fracture surfaces
Gas turbines
Heating
Liquid phases
Mechanical properties
Microstructure
Precipitates
Service life
Shear strength
Solidification
Superalloys
Transient liquid phase bonding
title Effect of two-step heating transient liquid phase bonding on microstructure and mechanical behaviour of IN-738LC gas turbine components
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