Method for forging niobium-tungsten alloy forged ring

A method for forging a niobium-tungsten alloy forged ring, comprising:

• (S1) subjecting a niobium-tungsten alloy ingot to blanking, turning and chamfering to obtain a primary blank;
• spraying an anti-oxidation coating on a surface of the primary blank to obtain a secondary blank;
• sheathing the secondary blank with a stainless-steel sheath followed by heating to obtain a tertiary blank;
• and subjecting the tertiary blank to upsetting to obtain a primary pancake by using a flat die hammer, rapid forging press or hydraulic press;
• (S2) machining the primary pancake to remove the stainless-steel sheath and an oxide scale and defect on a surface of the primary pancake;
• subjecting the surface of the primary pancake to fluorescent penetrant inspection/dye penetrant inspection;
• when the surface of the primary pancake is free of defects, subjecting the primary pancake to vacuum stress-relief annealing to obtain a secondary pancake;
• and subjecting the secondary pancake to wire electrical discharge machining (WEDM) to form an inner hole to obtain a ring blank;
• (S3) subjecting the ring blank to core shaft/saddle forging on the flat die hammer or rapid forging press to obtain a crude forged ring;
• and
• (S4) subjecting the crude forged ring to vacuum recrystallization annealing to obtain a desired forged ring.