|About this Abstract
||10th International Symposium on Superalloy 718 and Derivatives (2023)
||Superalloy 718 and Derivatives
||Mechanical and Microstructural Properties of Brazed Honeycomb Liner Material Haynes 214
||Jonas Vogler, Jieun Song, Jakob Huber , Rainer Völkl, Uwe Glatzel
|On-Site Speaker (Planned)
Honeycomb sealing systems are used in aircraft turbines to minimize leakage air in the gaps between rotating parts and the turbine casing in order to improve efficiency and thus reducing carbon dioxide emission . The honeycomb structure of sealings protects the fins of the rotating turbine blades from critical damage when a contact caused by thermal or mechanical expansion occurs . The honeycombs itself are point welded thin metal sheets of a nickel-based superalloy brazed on to a substrate usually also made of a nickel-based superalloy. During the brazing process braze filler alloy is drawn into gaps between the metal sheets by capillary forces.
In this work the mechanical performance of Haynes 214 metal sheets brazed with the nickel-chromium-silicon braze filler BNi 5 (71 wt.% Ni, 19 wt.% Cr, 10 wt.% Si) is investigated. Tensile properties of as brazed metal sheet composites are tested.
Interdiffusion zones and hard particles with high chromium contents are observed along the brazed joint. Even a very thin brazing layer reduces the ductility considerably.
 H. L. Stocker, D.M. Cox and G.F. Holle NASA Report, 1977, No. NASA-CR-135307.
 D. Sporer and D. Fortuna Welding Journal, 2014, Volume 93(2),44–48.
||Definite: At-meeting proceedings