Microstructure-Mechanical Properties Relation of TLP-Bonded FSX-414 Superalloy: Effect of Homogenization Design
Source abstract
Abstract
Co-based FSX-414 superalloy is especially used for first-stage nozzles of gas turbines. Transient liquid phase (TLP) bonding has potential as repair process for these nozzles. In this study, homogenization of TLP-bonded FSX-414 superalloy at optimum bonding condition (1150 °C/5 min) was conducted at 1175, 1200, and 1225 °C for 1, 3, and 6 h. Homogenization at 1175 °C/1 h had no effect on removing the diffusion-affected zone (DAZ) phases. Increasing the time to 6 h was effective in removing DAZ phases and boride phases formed due to liquefaction, but compositional homogenization was not complete. Homogenization at 1200 °C for 1 h caused boride phases to form adjacent to the joint and in the base metal. By increasing the time to 3 h produced joint, free of these phases. At 1225 °C/3 h homogenization condition, using a Ni-etchant and EDS analysis across the joint showed appropriate combination of compositional and microstructural homogenization including removed DAZ phases. The highest hardness, the most uniform hardness profile across the joint, and the highest shear strength (91% of the base metal strength) in addition to the microstructural features showed the best joints homogenizing at 1225 °C for 3 h.
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Research context
OpenAlex topics: High Temperature Alloys and Creep · Microstructure and Mechanical Properties of Steels · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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