Bismuth-titanium alloy and application thereof

Abstract

The invention discloses a bismuth-titanium alloy, and belongs to the technical field of the preparation of free-machining alloy steel. The bismuth-titanium alloy comprises the following components in percentage by weight: 15 to 75 weight percent of bismuth, less than or equal to 0.8 weight percent of inevitable impurities, and the balance of titanium. The invention has the characteristics that the alloying treatment is feasible, the yield of the bismuth is high and the like; and the bismuth-titanium alloy is applicable to additives of alloying treatment of free-machining steel.

Description

technical field [0001] The invention relates to a bismuth-titanium alloy, in particular to a bismuth-titanium alloy used for alloying treatment of free-cutting alloy steel, and belongs to the technical field of alloy steel (C22C alloy) preparation. Background technique [0002] Metal bismuth (Bi) is silver-white in appearance, has a strong metallic luster, is brittle, and has an orthorhombic crystal structure. Because metal bismuth is non-toxic, and has a low melting point and high flexibility similar to metal lead, it is widely used in industry. It is widely used as a substitute for lead. Adding bismuth to cast iron, steel and aluminum alloys can improve its cutting performance. Bismuth-containing free-cutting alloy steel has become an urgent need for modern manufacturing due to its environmental friendliness. An industrial raw material. [0003] However, the low melting point of bismuth (271.3°C) has caused great difficulties in the alloying treatment of bismuth free-cutt...

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Problems solved by technology

[0003] However, the low melting point of bismuth (271.3°C) has caused great difficulties in the alloying treatment of bismuth free-cutting alloy steel and the production of alloy steel.

Therefore, due to the oxidative burning loss and evaporation of bismuth, it is completely infeasible to adopt metal bismuth as the alloying treatment additive of the alloy steel. The melting point of bismuth-manganese alloy is lower (1244°C), and the melting point of bismuth-manganese alloy is lower (446°C); therefore, when it is used as an additive for alloying treatment of free-cutting alloy steel, the burning loss of bismuth element when bismuth-manganese alloy is added to free-cutting alloy steel It is still very large, and it is still difficult to realize its industrial application. However, the search results of Chinese patents show that the alloying treatment is feasible, and the additive bismuth alloy used in the alloying treatment of free-cutting alloy steel with high yield has not yet been seen except bismuth-manganese-iron alloy. According to other reports, the melting point of ferrobismuth manganese is still not high (according to the patent report, its melting point is about 1000°C)

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