The influence of annealing temperature in original pre-deformation round bars on structure and mechanical properties of forgings made of EP742-ID alloy

Lomberg B.S., Moiseev N.V., Letnikov M.N., Korotkiy A.V.
UDC
669.018.44:669.245
DOI
10.18577/2307-6046-2018-0-5-12-17
Article PDF (Russian) (1005.81 KB)
How to cite
Lomberg B.S., Moiseev N.V., Letnikov M.N., Korotkiy A.V. The influence of annealing temperature in original pre-deformation round bars on structure and mechanical properties of forgings made of EP742-ID alloy // Proceedings of VIAM. 2018. No. 5. DOI: 10.18577/2307-6046-2018-0-5-12-17. URL: https://test.viam.ru/en/journal/2018/5/2
Keywords
recrystallization, recrystallization annealing, microstructure, mechanical properties.
Abstract

Now to low-dimensional gas turbine engines (GTE) widely apply disks made in FSUE «VIAM» from heat resisting deformable alloy EP742-ID. Initial preparations of punchings of disks for low-dimensional GTE are the press bars with a diameter of 140–150 mm made by method of extrusion from ingots with a diameter of 320 mm of double vacuum smelting (VI+VDP). Recrystallization of original compacted round bars made of EP742-ID alloy, used as a blank to the isothermal forging process of small-sized disks for gas-turbine engine, has been researched. Influence of recrystallization annealing in a single-phase area on mechanical properties of forgings material after finish heat treatment has been determine in the article. The conclusion is in summary drawn that carrying out annealing before deformation at temperature on 15–25°C above Тп.рγʹ allows to increase stability of plastic properties (δ, ψ, KCU) punchings from alloy EP742-ID, and also it is essential to reduce number of re-testing and repeat

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