A kind of preparation method of high tungsten and high cobalt nickel alloy fine-grained sheet material

Abstract

The invention provides a preparation method of a high-tungsten and high-cobalt nickel alloy fine-grain plate, and belongs to the field of metal material preparation. An alloy is basically prepared from the components in percentage by weight: 25-45% of tungsten, 15-25% of cobalt, and the balance of nickel and inevitable impurities. Preparation of the fine-grain alloy plate comprises the following steps of (1) preparation of a cast ingot; (2) hot forging for cogging; (3) hot rolling; and (4) solid solution heat treatment. By adopting the hot rolling preparation method, the requirement for the equipment capacity can be lowered, the high-tungsten and high-cobalt nickel alloy plate with the uniform and fine grain can be obtained, the blank of a hot rolling process of the high-tungsten and high-cobalt nickel alloy fine-grain plate at home and abroad is filled, the qualified plate is provided for obtaining a shaped charge liner blank through processes such as spinning and stamping, and meanwhile the preparation method further has the advantages of high production efficiency, good process stability, low cost, easy-to-achieve industrial production and the like.

Description

technical field [0001] The invention relates to the field of metal material manufacturing. More specifically, it relates to a method for manufacturing a high-tungsten and high-cobalt nickel alloy fine-grained plate. Background technique [0002] The high-tungsten and high-cobalt nickel alloy involved in the present invention belongs to a nickel-based single-phase alloy, and the matrix elements include nickel, cobalt and tungsten. Nickel alloys with high tungsten and high cobalt have the advantages of high density, high sound velocity, and high fracture ductility, and are very suitable for the preparation of medicine-shaped masks. The processing methods for preparing the drug-type cover include: spinning, stamping, pendulum rolling, die forging, extrusion, etc. Among them, spinning and stamping processes require sheet blanks, and alloy sheets are generally prepared by hot rolling. [0003] Compared with conventional materials, due to the addition of a large amount of tungst...

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Problems solved by technology

[0003] Compared with conventional materials, due to the addition of a large amount of tungsten (≥25wt.%) and cobalt (≥15wt.%) elements, the alloy has high strength and hardness at room temperature, and poor plasticity and other indicators

The main difficulties in plastic deformation of nickel alloys with high tungsten and high cobalt are: (1) The strength and deformation hardening index are very high. It is more than 4 times that of steel, and the deformation hardening index at high temperature is much higher than that of ordinary steel; (2) The plasticity is poor. Due to the high content of tungsten and cobalt, the alloy is significantly strengthened, and the plasticity of the alloy is also low. , high tungsten and nickel cannot even be plastically deformed at low temperatures; (3) The temperature range of hot working is relatively narrow. On the one hand, the melting point of the alloy decreases due to the addition of a large amount of tungsten and cobalt elements; Plastic deformation needs to be carried out above the recrystallization temperature, and the recrystallization temperature of high-tungsten and high-cobalt nickel alloy is relatively high, which leads to a narrow range of thermal processing temperature. If the temperature is not well controlled, the structure and performance after processing will be extremely poor.

(4) The high-tungsten and high-cobalt nickel alloy has no recrystallization phenomenon during the heating process. If the microstructure and properties cannot meet the actual needs after billeting, the microstructure cannot be improved by phase change and recrystallization. The improvement of the internal microstructure can only rely on Recovery and recrystallization during the deformation process, and the uniformity of the recrystallized structure directly depends on the deformation process

However, the alloy resistance of the cold deformation process is extremely high, which requires high equipment capacity, mold size and mold material, and requires annealing process to obtain uniform grain size, and the process is relatively complicated.

So far, no research on high-tungsten, high-cobalt-nickel alloys has been found in China, let alone research on the preparation method of hot-rolled sheets and the control of grain uniformity

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