IDEA #6B6O97 Heat-Resistant-Nickel Alloys For Repair And Manufacture Of Aircraft And Ground Engine Gas Turbine Components

HEAT(cid:2)(cid:2)RESISTANT NICKEL ALLOYS FOR REPAIR AND MANUFACTURE OOFF AIRCRAFT AND GROUND ENGINE GAS TURBINE COMPONENTS APPLIED RESEARCH • NEWMATERIALS RESEARCH Description Components of gas turbine units operate under severe condi(cid:2) tions at temperatures of up to 1300 oC. These components are made from heat(cid:2)resistant high(cid:2)nickel alloys containing a high amount of ў’(cid:2)phase. High heat resistance is achieved through a high degree of alloying, and through ensuring of structure with directed solidification or of a single(cid:2)crystal type. The alloys are characterized by a high sensitivity to cracking in making of permanent joints or in repair of components. Investigations into weldability of such alloys were conducted by the E.O.Paton Electric Welding Institute and Pratt & Whitney – Paton (Kyiv, Ukraine) in collaboration with Oak Ridge National Laboratory (Knoxville, USA). The investigation results proved the feasibility of producing sound joints with a different level of strength and service properties at high temperatures. New joining methods make it possible to produce monolithic all(cid:2)welded members of structures, providing a substantial extension of their life, instead of mechanical fixing of blades in disks and mechanical joining of individual assemblies. These methods passed the tests, and now they have found applica(cid:2) tion in repair operations and addressing the problems associ(cid:2) ated with extension of residual life of structures. Innovative Aspects and Main Advantages Electron beam welding, microplasma welding, electric spark cladding, microplasma spraying, brazing process modifica(cid:2) tions, and precision A(cid:2)TIG welding allow selection of process(cid:2) es to provide the highest quality and address the following problems, depending upon the composition and heat resist(cid:2) ance of nickel alloys: • repair of blades and vanes, and extension of their lives; • manufacture of monolithic members of gas turbine units of the blisk type; • production of sound joints in a new generation of structur(cid:2) al materials with a high content of intermetallic phase; • arrangement of a specialized workshop for repair of gas turbine unit components made from heat(cid:2)resistant high(cid:2)nick(cid:2) el and intermetallic alloys. • estimation of actual residual life of gas turbine unit compo(cid:2) nents, and assignment of methods for restoration of their service life. Areas ooff application Aircraft engines, marine and ground gas turbine units, steam turbines, and high(cid:2)pressure compressors. Pic. 1 Structure of weld ChS(cid:2)70 Pic2. Repair welding on blade of alloy EP 539 Stage ooff development Technology, life estimation methods and equipment can be adapted to customer’s needs. Technologies can be demon(cid:2) strated and verified at experimental workshops. Contact Details Konstantin Yushchenko. State(cid:2)owned enterprise Scientific and Technical Center “Advanced Technologies” of Paton Welding Institute of National Academy of Sciences of Ukraine. 11, Bozenko str., Kyiv(cid:2)5, 03680, Ukraine Tel. +38 044 2874353 Fax +38 044 2874353 E(cid:2)mail: yu.kon@paton.kiev.ua INNOVATIVETECHNOLOGY OPPORTUNITIES FROM THE STCU 25