TLP repaired IN738LC superalloy with uneven surface defect gap width after post heat treatment: Microstructure and mechanical properties

Ye, Y.; Zou, Guisheng; Long, W.; Bai, Hailin; Wu, Aiping; Liu, Lei; Zhou, Yunhong

doi:10.1016/j.jallcom.2018.02.343

Cited by 15 publications

(1 citation statement)

References 25 publications

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“…The interest in repair welding of gas turbine components has been increasing recently due to the combination of high raw material costs and high production costs, political pressure to increase recycling, and decreasing the amount of raw materials. 1,2 Fusion welding, brazing and diffusion bonding are main techniques, which are used for repairing in-service and manufacturing defects of the superalloy components. The hot cracking risk in fusion welding 3,4 and time-consuming problem in brazing and diffusion bonding processes are the main concerns.…”

Section: Introductionmentioning

confidence: 99%

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

Amirkhani

Shirvani

Beidokhti

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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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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