SU597494A1 - Method of treatment of crystallizing metal - Google Patents

Description

warmth. Accordingly, in the first case, the supercooling near the crystallization front increases and the crystallization process proceeds more intensively, which, under unchanged external cooling of the ingot, provides additional growth of the solid phase and a decrease in the depth of the well. Similarly, in the second case, the release of additional heat at the crystallization front contributes to increasing the volume of the liquid metal well and its depth. Regulation of the intensity of these effects is achieved by changing the distance between the crystallization front and the immersed electrode.

Primer p. In an installation for continuous casting, an AMG-6 alloy ingot with a size of 300x1300 mm is cast into an electromagnet crystallizer with the following technological parameters: speed

pour 85 mm / min; melt temperature 710 ° C; supply voltage of the electromagnetic crystallizer 9O V; cooling water temperature cooling water consumption of 11 kg / s; the maximum depth of the hole is 295 mm.

The immersed electrode is set along the casting axis; the second electrode is brought into contact with the ingot at a distance of 320 mm from the level of the mirror and the metal in the punche. Next, two types of tests are carried out ./

1. At a given coolant flow rate of 12.5 kg / s, a constant electric current is passed from the solid phase to the melt. In this case, the immersed electrode is moved in the directions of the crystallization front to 0.8 depth of the well. The depth of the well is measured using a sensor equipped with

three measuring heads. Signals are recorded on an oscilloscope.

In this case, the maximum depth of the well is reduced to 24 mm. Next, a comparative study of the properties of the central zone of ingots cast by serial technology and using the proposed method is carried out. Research data gfivedeny in the table. one.

2. Conducted research on artificial options for the flow rate of the cooler supplied to the ingot. The specified depth of the well, which must be maintained during the casting process, is 250 mm. The flow rate of the cooler varies between 9.4-18.7 kg / s. All other process parameters are maintained at the level specified above. For the limiting values of the flow rate of the cooler, the depth of the well is measured for the case without the use of the proposed method.

Research data are presented in Table. 2

The test results show that the application of the described method allows, at a given cooling rate, to reduce the depth of the liquid metal fodder and thereby achieve an increase in the density and enhancement of the mechanical properties of the central 3O {jbi ingot. the wells and the shape of the crystallization front are maintained at an optimum level. This reduces the water consumption for the cooling of the ingot and reduces the load on the pumps in the reverse cooling system.

Without application of pred2,76oz lagged method

With the use of pre2, 7936. lagged way

Spreadsheets

11.5

21.7

25.8

14.9

No use

proposed

of the way

18.7

Using

chopped off

of the way

Claims (1)

1. USSR author's certificate No. 526443, cl. In 22 13 27/02, 1974.