Alloy based on tungsten

 

The invention relates to the field of metallurgy, in particular the production of sintered hard alloys based on tungsten, used for the manufacture of products subjected to significant total deformation up to 50-80%, for example for special items. Proposed alloy based on tungsten containing cobalt, tantalum, Nickel, iron, which further comprises lanthanum, in the following ratio, wt. %: cobalt 0,6-0,8; tantalum 0,2-0,4; Nickel 2,0-5,0; iron of 1.2-1.6; lanthanum 0,1-0,2; tungsten else. The technical result of the invention is the provision of obtaining products with a density of 17.8 18,2 kg/cm3and high strength and ductility. table 1.

The invention relates to the field of metallurgy, namely, to obtain sintered hard alloys based on tungsten, used for the manufacture of products subjected to significant total deformation up to 50-80%, for example for special items.

Known sintered tungsten alloy containing iron, cobalt and Nickel as a binder in the weight ratio 1:1:3. The content of tungsten is in the range of 90-95 wt.% (U.S. Pat. Germany 3226648, MKI3With 22 1/04, 1984). This alloy may be subjected to a single geticheskie characteristics cannot exceedin=of 1350-1450 MPa, and elongationno more than 4-6%, which does not allow to use these alloys in the production of the corresponding destination because of possible damage to the parts during operation.

The closest technical solution is the welding alloy containing, wt.%: Tungsten - 40-80 Nickel - 10-40 Iron - 1-25 One or more elements from the group of cobalt, chromium, titanium, tantalum, ruthenium, vanadium and molybdenum Up to 5 (U.S. Pat. England 1301412, CL SA, 1972). However, these alloys have a high brittleness and can not practically be subjected to plastic deformation, the density does not exceed 16,8 of 17.2 kgf/cm3and strength and plastic characteristics do not exceed 900-1150 MPa and=1-2%. With a large Nickel content in the alloy appears porosity, which reduces the strength and ductility of the alloy. Accordingly, these alloys can be used as surfacing materials for improving the durability of the dies during hot stamping.

The basis of the invention is the development of alloy that provides obtaining products with a density of not less than 17,8-18,2 kg/cm3and improved characteristics of strength and plasticity, i.e.

When the content of lanthanum less than 0.1 wt.% the necessary strength and ductility are not attained.

When the content of lanthanum more than 0.2 wt.% increasing the grain size, i.e. more than 40 μm, which dramatically reduces the strength and ductility and can even lead to fracture of the material during subsequent plastic deformation.

The Nickel content in the alloy in the amount of 2.0 to 5.0 wt.% reduces the sintering temperature up to 1350o-1380othat allows you to get a small substructure tungsten grains and, consequently, high plastic characteristics of the alloy during deformation.

When the Nickel content of less than 2.0 wt.% quality alloy in comparison with the known is not improving.

When the Nickel content in the alloy is more than 5.0 wt.% not provide the required density (snize the Alloy produced by powder metallurgy followed by pressing on the press with a force of 400 tons. Pressing were subjected to two-step sintering with subsequent hardening by rotational forging with a total deformation of at least 60%. For comparison has been made of the alloy of the prototype.

Properties of the samples are presented in the table in comparison with samples with exorbitant ratios of components.

As can be seen from the table, the alloy of the proposed formulation provides enhanced strength and ductility of the product.


Claims

Alloy based on tungsten containing cobalt, tantalum, Nickel and iron, characterized in that it further comprises lanthanum in the following ratio, wt.%:
Cobalt - 0,6-0,8
Tantalum - 0,2-0,4
Nickel - 2,0-5,0
Iron - 1,2-1,6
Lanthanum - 0,1-0,2
Tungsten - Ostalnoe

 

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3 cl, 1 tbl, 10 ex

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3 cl, 3 dwg, 1 tbl, 1 ex

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2 tbl

Alloy // 2311473

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1 tbl

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1 tbl, 1 ex

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1 tbl

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1 tbl

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1 dwg

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1 tbl

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FIELD: metallurgy.

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1 tbl

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