Tungsten Alloy Sheet Innovation Rolling Processing Method

Tungsten alloy doped with silicon, aluminum and potassium is a tungsten resistant alloy with high temperature resistance. In the production process through to tungsten powder doped with trace silicon (Si), Al (AL), potassium (K) oxides, and volatile oxide dopants in the billet during the sintering process of Si and Al, K elements in the form of bubbles remaining in the grain interior. 

This makes the material processed by pressure has two recrystallization properties after high temperature treatment. It is easy to form a large grain structure with large aspect ratio, so that the tungsten alloy doped with silicon, aluminum and potassium has excellent high-temperature deformation resistance.

The tungsten plate rolling production technology at present, tungsten alloy sheet produced because in the rolling process of grain has been rolling after refinement, formed after the two recrystallization heat treatment organization of small length diameter ratio (less than 10), and easy to form coarse equiaxed grains and abnormal growth of large grains lead, tungsten alloy anti deformation capacity decreased significantly.

Some scholars have put forward a rolling process of tungsten alloy sheet. Through controlling the parameters such as rolling temperature, pass deformation and annealing temperature, the uniform large grain structure is obtained. The tungsten alloy plate produced by the product has uniform grain structure and the ratio of grain diameter to diameter is no less than 10.

Step one, under the protection of hydrogen or inert gas, the thickness of 30mm ~ 40mm tungsten alloy slab heated to 1500 ℃ ~ 1600 ℃ and holding 20min ~ 60min, and then after the heat preservation of the tungsten alloy slab three pass rolling , the first pass rolling rate of 15% to 20%, the second and third pass rolling rate of 20% to 30% of the rolling process between adjacent two passes Rolling the rolled tungsten alloy slab for heating;

Step two, under the protection of hydrogen or inert gas, the step one after three pass rolling the tungsten alloy slab annealed;

Step three, under the protection of hydrogen or inert gas, the second step in the annealed tungsten alloy slab heated to 1300 ℃ ~ 1400 ℃ and incubated for 15min ~ 30min, and then the insulation of the tungsten alloy slab four times rolling, rolling pass processing rate of 15% to 20%, during rolling two adjacent to the rolling of the tungsten alloy slab heating furnace;

Step four, under the protection of hydrogen or inert gas, annealing the tungsten alloy slab after the fourth pass in step three;

Step five, under the protection of hydrogen or inert gas, the step four annealed tungsten alloy slab heated to 1200 ℃ ~ 1300 ℃ and incubated for 15min ~ 30min, and then after the heat preservation of the tungsten alloy slab for multiple passes rolling and rolling pass processing rate of 15% to 20%, to obtain a thickness of 2.5mm ~ 3.5mm plate, the rolling process between two adjacent rolling of the tungsten alloy slab back to the furnace heating;

Step six, under the protection of hydrogen or inert gas, the fifth step in the multi-pass rolling tungsten alloy slab after high temperature recrystallization heat treatment to obtain a tungsten alloy sheet.

Compared with the traditional tungsten plate rolling technology, the method is simple, the equipment has a wide range of sources, no pollution to the environment, reliable performance, and mass production.

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