The method of processing of magnesium alloys and products made this way

 

The invention relates to the field of mechanical engineering and aircraft and can be used in the manufacture of the deformed semi-finished products of magnesium alloys. In the proposed method, including heating of cast billets, manual deformation and cooling, according to the invention, the heating of the workpiece is conducted before each transition step of deformation, manual deformation of the workpiece is performed with a total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air carry out a final heating to 370-420oWith isothermal and final deformation speed 110-4-210-2with-1. Heat cast billets before each transition step deformation is carried out until 280-420oC. Proposed also a product made of the claimed method stepwise deformation of magnesium alloys. The method allows to increase yield and to reduce the anisotropy of the mechanical properties of the deformed semi-magnesium alloys, and products derived from them, while maintaining the values of tensile strength. 2 C.p. f-crystals, 1 table.

The invention relates Aichatou of magnesium alloys, designed for the aerospace industry and engineering (parts of seats, trim cockpit, decorative details of the salon, as well as structural components: brackets, rockers, and others).

A method of processing of magnesium alloys basis, including heating to a temperature of dissolution of hardening phases, cooling and deformation, in which when the reduction processing heating and cooling carried out repeatedly, and the heat of lead alloy with a speed of 50-60oC/min, cooling to spend 20010oWith, and the deformation is carried out at a temperature of heating followed by cooling in water. The deformation is carried out in two stages, the first stage is carried out at a cooling before the final heating, and the second when the temperature of heating followed by cooling in water.with. The USSR 1033569).

The disadvantage of this method is the increase of the anisotropy of the mechanical properties of a deformable semi-finished products, which does not allow to obtain products, working in conditions of loading in the lateral and elevation directions, which reduces the possibility of using magnesium alloys.

The closest analogue, taken as a prototype, is the way Ordo 280-360oWith, deformation spend at least one more transition, with all transitions deformation is carried out with one heat continuously to each other with a speed of (210-1-610-2with-1and the total degree of deformation of 88-93%, and cooling is carried out on the air (RF patent 2148104).

The disadvantages of the prototype method include low level of yield strength and a significant anisotropy of the mechanical properties of the deformed semi-finished products, which makes manufacture of these products running under load in the direction across the grain.

An object of the invention is to increase the yield and decrease the anisotropy of the mechanical properties of the deformed semi-finished products of magnesium alloys and products made from them, while maintaining the values of tensile strength.

The goal of the project is achieved by a method for processing magnesium alloys, including heat cast billets, manual deformation and cooling, in which heating of the workpiece is conducted before each transition step of deformation, manual deformation zagotovka athelny heating to 370-420oWith isothermal and final deformation speed (110-4-210-2)with-1. Heat a cast billet is carried out before each transition step of deformation, the heat required for the preparation of patterns to subsequent deformation, should be considered the preferred temperature range 280-420oC.

Also proposed product, performed the claimed method of treatment of magnesium alloys.

The authors found that heating of cast billets before each transition step strain when reaching the total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air the final heating to 370-420oWith isothermal and final deformation speed (110-4-210-2)with-1create the necessary conditions for the formation of a special structural-phase state of the deformed semi-finished products of magnesium alloys, the choice of temperature range heating of billets prior to each stage of the deformation caused by the transition temperature of the alloy and the m strain, the presence ultrarelativistic hardening phases and fine equiaxial grains. Formed structural-phase state of the alloys increases the importance of the yield strength and reduction of the anisotropy of the mechanical properties of the deformed semi-finished products. Temperature range 280-420oWith is preferable to achieve a technical result.

Examples of the implementation of the Workpiece low-magnesium alloy system Mg-Zn-Zr were subjected to stepwise deformation with a thickness of 50 mm to a thickness of 1.5 mm At this temperature before each stage of deformation amounted to 37010oWith a total degree of deformation of 97%.

The obtained intermediate semi-finished products were cooled to room temperature, then heated to 39010oWith and permanently deformed in isothermal conditions with a speed of 110-3with-1.

The table shows the properties of the deformed semi-finished products made of the proposed method and the method prototype.

The proposed method of treatment, compared with the method of the prototype, as follows from the table that has the following preimushestvah anisotropy of strength properties decreased: - the tensile strength of 1.5-2.0 times, the yield strength of 1.8-2.0 times.

Using the proposed method of processing magnesium alloys to reduce weight products, increase their operational reliability and service life.

Thus, the application of the proposed method allows to obtain products of magnesium alloys with improved strength and processing properties, low anisotropy of strength properties, which increases the life and reliability of these products, reduces their weight and extends the application of magnesium alloys.

Claims

1. The method of processing of magnesium alloys, including heat cast billets, manual deformation and cooling, characterized in that the heating of the workpiece is conducted before each transition step of deformation, manual deformation of the workpiece is performed with a total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air carry out a final heating to 370-420oWith isothermal and final deformation speed 110-4-210-2with-1.

2. The method according to p. 1, characterized in that the heating of the cast for the new alloys, received by way of step strain, characterized in that it performed way under item 1 or 2.

 

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21 cl, 7 dwg, 5 tbl, 2 ex

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EFFECT: raised plasticity and deformability of magnesium alloys at room temperature.

2 ex

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18 cl, 1 tbl, 11 dwg

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