METHOD OF MANUFACTURE OF A SHEET SEMIPRODUCT PRODUCED OUT OF AN ALLOY BASED ON NICKEL OF INCONEL 718 TYPE Russian patent published in 2006 - IPC C22F1/10 

FIELD: nonferrous metallurgy; production of the sheet semi-products made out of the hardly-deformed nickel alloys.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to production of the sheet semiproducts made out of the hardly-deformed alloy based on nickel of Inconel 718 type, which may be used at manufacture of hollow products by molding and a diffusion welding in conditions of superplasticity. The invention offers the method of production of such sheet semiproducts. The method includes: production of a casting after a smelt, deformation working of the casting by rolling with production of a blank part and its final rolling with production of the sheet semiproduct. The deformation working of the casting is exercised by rolling in the single-phase field of the alloy, and the final rolling is conducted within the temperature range of 975-825°C with the deformation speed of 10^-4 - 10¹ s^-1, with a total degree of the deformation of no less than 50 % at least for two runs to provide the process of a dynamic recrystallization. The technical result of the invention is expansion of production capabilities at manufacture of the sheet semiproducts made out of the hardly-deformed alloy based on nickel of Inconel 718 type at simultaneous improvement in quality due to production of the homogeneous fine-grain structure with the grains sizes of up to 1 micron and less providing expansion of the temperature-speed interval of superplasticity for the subsequent manufacture from it a product, as well as the products of responsible designation, which need the superplastic formation.

EFFECT: the invention ensures expansion of production capabilities at manufacture of the sheet semiproducts made out of hardly-deformed alloy based on nickel of Inconel 718 type, improvement of their quality, expansion of the temperature-speed range of superplasticity to produce the products and special purpose products requiring the superplastic formation.

15 cl, 3 dwg, 2 tbl, 6 ex