Forging method for improving quasi-beta forging uniformity of slender rod-like TC18 titanium alloy forged piece

Abstract

The invention discloses a forging method for improving the quasi-beta forging uniformity of a slender rod-like TC18 titanium alloy forged piece. The method is characterized in that a loose tooling forging mode is adopted for quasi-beta forging. The method comprises the following steps of: (1) preparation of a rough blank; (2) preparation of loose tooling and arrangement of equipment; and (3) loose tooling quasi-beta forging. Compared with a free forging mode for producing the slender rod-like TC18 titanium alloy forged piece, the forging method has remarkable quasi-beta forging advantages that the forging time is greatly shortened, and deformation required by material process characteristics is smoothly finished; and in addition, the forming dimension of the forged piece is high in accuracy, the design and machining allowance is greatly reduced, and the product effectiveness is improved.

Description

technical field [0001] The invention relates to a forging method, in particular to a forming method suitable for improving the microstructure and performance uniformity of the slender rod-shaped TC18 titanium alloy quasi-beta forging. Background technique [0002] TC18 titanium alloy is a new type of titanium alloy that has been developed and used in my country in recent years. It is a near-β-type titanium alloy material with a high degree of alloying, high strength and good comprehensive performance indicators. The production method of forgings is quasi-β forging plus double annealing. The microstructure and uniformity of forgings mainly depend on the quasi-β forging link. Although its performance index can be adjusted in a large range through heat treatment, quasi-β forging determines the performance of forgings. A key link in tissue homogeneity. [0003] Quasi-β forging is a new type of forging method developed in recent years. The heating method of the forging blank is ...

AI Technical Summary

Problems solved by technology

However, when free forging is used for quasi-β forging, the temperature of the material coming out of the furnace is about 880°C, and the forging method is free forging (3) one-way elongation. The specific process of this material requires that at least 25% of the elongation deformation must be completed during quasi-β forging However, in the actual production process, due to the small cross-section and large length of the billet, the cooling speed of the billet is relatively fast. When free forging is used to elongate, the actual temperature of the other half of the billet has been cooled to 800 during the process of elongating one end. At about ℃, the deformation resistance increases greatly, and the elongation difficulty increases. The billet is quickly cooled to near the final forging temperature, and the actual elongation deformation is difficult to complete. The final forging has coarse grains, low elongation, and very uniform properties Poor, resulting in the scrapping of the product and heavy losses

Images