The method of processing of magnesium alloys

 

(57) Abstract:

The method of processing of magnesium alloys includes heating to 280-360°C, manual deformation with a total degree of 88-93% in several transitions from one heat continuously to each other with a speed of 210-1-610-2with-1and air cooling. The technical result achieved by carrying out the invention, consists in forming fine patterns in the deformation process. table 1.

The invention relates to the field of metallurgy, in particular to methods of processing of alloys based on magnesium, and can be used in the production of forged semi-finished products such as forgings drive road wheels.

A method of processing of magnesium alloys, including heating to 280-400oC and the deformation at this temperature with a deformation rate of 70-90% (Magnesium alloys. The Handbook. So 2. Production technology and properties of castings and deformed semi-finished products. Ed. by I. I. Guriev, M. C. Cukrowa. - M.: Metallurgy, 1978. S. 174).

The claimed method of processing coincides with the given method on the following essential features: the presence of the operation of the heating and deformation, the heating mode to 280-360oC, the condition is t forgings sufficiently high and stable level of strength and plastic properties.

The closest in technical essence to the proposed method is a method of treatment of magnesium alloys, including multiple heating to a temperature of dissolution of hardening phases with a speed of 50-60oC/min and cooling to 200+10oWith a two-stage deformation, and the first stage is carried out at a cooling before the final heating, and the second when the temperature of the heating and subsequent cooling in water (Ed. mon. USSR N 1033569, C 22 F 1/06, 1983) prototype.

In the known method the first stage of deformation is carried out at a temperature below the deformation of the heat, and the second stage at a temperature of initial deformation heating.

The claimed method of processing coincides with the given method on the following essential features: the presence of a heating operation to a temperature of deformation, the deformation operation, the execution order of the deformation in two stages, the condition of the second phase of deformation when the temperature under deformation, the final cooling operation.

The disadvantage of this method of processing magnesium alloys are: large duration of the technological cycle, uneven rashly and not enough high plastic properties.

Task to be solved by the claimed invention is directed, is to increase the plasticity of the material forged semi-finished products while maintaining the strength characteristics.

The technical result achieved by carrying out the invention, consists in forming fine patterns in the deformation process.

This technical result is achieved in that in the method of thermomechanical processing of magnesium alloys, including heat, manual deformation and cooling, in accordance with the invention, heating is carried out to 280-360oC, with the deformation carried out at least one additional transition deformation, in this case, all transitions deformation is carried out with one heating continuously one after another with the speed of deformation 210-1- 610-2with-1and the total degree of deformation 88 - 93%, and cooling is carried out in the air.

Conducting deformation in several transitions continuously one after another from the same heat in the claimed range of strain rates, regulated by the combination of degrees of deformation on transitions from the condition for achieving the total degree of deformation 88-93% allows you to maintain during the Def is in the alloy fine patterns directly in the process.

The number of transitions deformation is three or more and depends on the type of alloy, the complexity of configuration stamping, the required level of properties.

The claimed method is implemented as follows. Procurement of magnesium alloys are heated to a temperature of deformation and subjected to stepwise deformation on presses, equipped with appropriate stamps. The time interval between transitions may take a few seconds and should be minimized. Finished stamping cooled in the air.

The claimed method was tested in the manufacture of forgings drive road wheels alloy MA. The processing conditions and mechanical properties are shown in the table.

As can be seen from the table, the ductility achieved the stated way, 2 - 2.3 times higher than the ductility of the prototype. In addition, the mechanical properties also increased by 1.7 to 9.5%.

The method of processing of magnesium alloys, including heat, manual deformation and cooling, characterized in that the heating is carried out up to 280 - 360oC, the deformation is carried out with at least one additional transition, with all transitions deformation is carried out with one heating continuously one after another soon with the spirit.

 

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