SU530771A1 - The composition of the cermet tape - Google Patents

Description

one

The invention relates to electrode materials used for mechanized surfacing of the working layer of parts of dies and other tools in various sectors of the metal industry of the industry.

A known metal-ceramic surfacing tape containing iron, graphite, ferrochrome, ferromanganese, boron carbide. However, this tape cannot be used to manufacture wear-resistant dies, since the maximum hardness of these alloys does not exceed 59 HI} C.

Also known metal-ceramic tape, containing the following components, wt.%:

Graphite

0.5 - 0.8

Nickel

0.4-1.2

0.7-1.0

Ferromanganese

0.4 - 0.8

Ferrosilicon

Ferrochrome

5 -7

0.9-1.4

Ferromolybdenum

 Iron powder

rest.

In order to increase the workability of parts, viscosity and ensure optimum hardness of the deposited layer, the composition contains even cobalt, ferrotitanium with the following ratio of components, wt.%:

Cobalt

16-20

8-13

Ferromolybdenum

8-43

Nickel 2.6 - 3.4

Ferrotitanium

Iron the rest.

Metal-ceramic tape is made in the form of (cast material, provides a martensite-aging structure of the weld metal with a good combination of viscosity and high hardness 60 after the final low-temperature heat treatment.

Metal-ceramic tape additionally contains, wt%:

Carbondo 0.06

Kremniydo 0.3

Manganese DO 0.4

Aluminum 0.3

Hromdo 0.2

The introduction of cobalt and ferrotitanium improves the mechanical properties of the deposited metal.

The proposed cermet tape allows to obtain martensitic steel in the deposited layer, which, after quenching at a temperature of 1050 ° C, has a martensitic structure

with a hardness of X-ray 32-34, after aging for 3 hours at a temperature of 500 ° C, it is hardened to X-ray 62-64, while retaining considerable viscosity.

In the hardened state, the deposited metal has the structure of carbon-free martensite, the crystal lattice of which is characterized by a lower tetragoiology than that of carbon martensite, as well as a high mobility of dislocations. This mainly explains the relatively low strength and low hardness in the quenched condition.

The high strength of the deposited metal is achieved as a result of aging, in the course of which the separation of finely dispersed evenly distributed intermetallic leads coherently associated with the matrix occurs.

The composition of the tape provides good surfacing properties: the absence of crystallization tre1tsin, holes, shells, good formation of the layer, OTcvTCTBHe brittle transitional zone of fusion

Example.

A sintered cermet tape of the following composition was made, wt.%: Nickel10

Cobalt18

Ferromolybdenum12 ()

Ferrotitanium, 3.2 (Ti- 35%)

IronErest

(The above components are taken in the form of powders)

The powders are mixed for 3 hours in a drum mixer with the addition of 4 cm of oil per 4 kg of mixture. The tape is rolled on the mill in rolls with a diameter of 180 mm at a speed of 5 m / min. Tape width 30 mm, thickness 09 mm. Porosity is 16%. Sintering was carried out in a hydrogen atmosphere for 0.5 h at 1050 ° C. The muffle was cooled in a jet of air, so that there was no lumping and the excessive brittleness of the tape caused by it.

Claims (1)

Invention Formula The composition of the cermet tape for the deposition of the working layer of parts of dies, containing ferromolybdenum, nickel, gel, and t and that with the aim of increasing the machined and parts, viscosity and ensuring optimum strength of the deposited layer, the composition contains cobalt, ferrotitanium in the following ratio of components, wt.%: Cobalt16-20 Ferromolybdenum813 Nickel8-13 Ferrotitanium2,6-3,4 IronErest