METHOD OF PRODUCING SEMI-FINISHED PRODUCTS FROM HIGH-STRENGTH NICKEL ALLOYS Russian patent published in 2019 - IPC C22F1/10 C21D8/02 

FIELD: metallurgy.

SUBSTANCE: method for production of semi-finished products from high-strength nickel alloy of Ni-Fe-Co system includes melting of ingot in vacuum-arc furnace, deformation of ingot, preliminary hot rolling and final cold rolling. After ingot melting vacuum-arc remelting is performed. Deformation of the ingot into the intermediate semi-finished product is carried out preferably by multi-step forging at the rate of deformation of 0.03–0.2 s^-1, at temperature of 40÷60 °C is higher than dissolution of intermetallic phases. Preliminary hot rolling on sheet semi-finished product is carried out in single-phase area at temperatures of 10÷60 °C is higher dissolution of intermetallic phases to thickness of 3–4 mm. Further thermal treatment of obtained hot-rolled sheets is carried out at the same temperature for not less than 20 minutes, final cold rolling with subsequent thermal treatment of sheet at temperatures higher than dissolution temperature of intermetallic phases, but not less than 1,040 °C for 10–20 minutes. Vacuum-arc remelting is preferably carried out according to the following mode: working current value of 2.0–2.4 kA, voltage of 20–22 V.

EFFECT: method enables to obtain semi-finished products from high-strength nickel alloys of the Ni-Fe-Co-Nb-Ti system with high level of characteristics of long-term strength at temperatures of up to 600–650 °C.

5 cl, 2 tbl, 2 dwg