Preparation method of high-quality large-specification niobium-tungsten alloy plate

Abstract

The invention discloses a preparation method of a high-quality large-specification niobium-tungsten alloy plate. The method comprises the following steps: 1, blanking after a cast ingot is subjected to flaw detection and is qualified; 2, vacuum annealing; thirdly, low-temperature forging is conducted, and a machined thick plate blank is obtained; fourthly, vacuum annealing is conducted after machining, and an annealed thick plate blank is obtained; 5, performing primary one-way rolling after the flaw detection is qualified to obtain a middle-thickness plate; sixthly, vacuum annealing is conducted, and an annealed-state middle-thickness plate is obtained; seventhly, second-time one-way rolling is conducted, and a finished-product thickness plate is obtained; 8, performing vacuum annealing and leveling to obtain a flat plate; and 9, performing vacuum annealing and flaw detection to obtain a finished plate. According to the preparation method, the limitation of a traditional process is broken through, preparation of the large-specification niobium-tungsten alloy plate with the unit weight larger than 50 kg, the width larger than 1000 mm, the high grain equiaxed degree, small mechanical property anisotropy, no surface hardening and qualified nondestructive inspection can be achieved, and the urgent requirement of a spaceflight high-temperature propeller at the present stage for the high-quality niobium-tungsten plate is met.

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