Accession Number : AD0694384

Title :   FEATURES OF PRODUCTION OF DISC FORGINGS FROM STEEL 1Kh12VNMF (EI802),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Generson,I. G. ; Babeeva,E. V. ; Libman,P. M. ; Tokarev,V. N.

Report Date : 12 DEC 1968

Pagination or Media Count : 13

Abstract : An experimental study of the production of two different types of turbine forgings of this steel both lacking any central apertures, indicates that despite their metalurgical complexity, they can in principle be satisfactorily processed if they are first cast in a basic furnace with blowing of oxygen through the molten bath and if their hot forging includes prior deep drawing with a reduction ratio of at least 2-2.5 and intermediate up-setting and is followed by isothermal annealing at 710-720C along with two-stage supercooling. Deep drawing and intermediate upsetting together serve to weld up the shrinkage defects, while supercooling assures a virtually total transformation of austenite and hence also the absence of any major phase stresses due to the decomposition of residual austenite in the cooled forging, and the prolonged isothermal annealing contributes to the diffusion of hydrogen, thus preventing flake formation and hydrogen embrittlement of the metal. (Author)

Descriptors :   (*GAS TURBINE ROTORS, *FORGING), (*STEEL, GAS TURBINE ROTORS), HEAT TREATMENT, CHROMIUM ALLOYS, HYDROGEN EMBRITTLEMENT, DRAWING(FORMING), USSR

Subject Categories : Fabrication Metallurgy
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE