Abstract
Vacuum furnace has been used for brazing repair of aerospace components, but it is a slow process which typically takes a few hours. The prolonged heating and cooling cycles could cause some adverse effects on the components such as excessive grain growth. A rapid brazing technique using induction coil was studied to evaluate its suitability for localized repair. Induction brazing of Inconel 718 was carried out using AMS 4777 brazing paste at different temperatures (950 °C, 1050 °C and 1150 °C ) for various durations (2 min, 10 min and 20 min). Microstructure and microhardness were evaluated. The experimental results show that brazing at 1050 °C leads to desirable microstructures in a short period of merely 2 min. The study demonstrates the potential application of induction brazing for rapid localized aerospace repair.
Highlights
IntroductionInconel 718 alloy is a high-temperature nickel-based superalloy that has been widely used in the aerospace industry due to its excellent physical and chemical properties at high temperatures [1,2]
AMS 4777 brazing alloy was carried out to evaluate the potential application of induction brazing for rapid localized repair of aerospace components experiencing in service damages on the surfaces
The induction brazing at a lower temperature and shorter time would be preferred
Summary
Inconel 718 alloy is a high-temperature nickel-based superalloy that has been widely used in the aerospace industry due to its excellent physical and chemical properties at high temperatures [1,2]. The diffusion brazing method ( known as transient liquid phase bonding) has been widely used for nickel-based superalloy repairs [8,9,10] It is a method of using brazing or filler alloy that contains melting point depressants such as silicon, boron and phosphorus to lower the bonding liquidus temperature. AMS 4777 ( known as BNi-2) brazing alloy was carried out to evaluate the potential application of induction brazing for rapid localized repair of aerospace components experiencing in service damages on the surfaces. Different combinations of the induction brazing temperatures and durations were studied, and the test results were evaluated to find out the optimum parameters Aerospace components such as turbine blades, vanes, shrouds, frames and combustors are often subjected to substantial damages during the operation. Repairing these damaged parts prolongs their service life and saves costs for the aerospace industry
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