Hydrostatic extrusion strain hardening deformation technology is an advanced processing technology , it is possible to obtain a 60% -80 % of the large deformation , further deformation can get more than 90% deformation , its working principle is: the bar in a high-pressure liquid medium plastically deformed under the action of the hydrostatic extrusion process , deformation of the workpiece in a high stress state three- tungsten alloy material inherent in the internal organization of microcracks and with the extrusion process for healing occurs constantly , final defects inside the material strain hardening reduced role to play .

Swaging process compared with the ordinary , hydrostatic extrusion deformation strengthening advantages: First, the amount of deformation under the same conditions , hydrostatic extrusion tungsten alloy strength is higher than the rotary swaging process tungsten alloy strength ; its Second, the hydrostatic extrusion process , particularly reasonable choice extrusion process parameters, tungsten alloy deformation capacity has been greatly improved relative terms , only once tungsten alloy extrusion can make a 60 % -80% deformation , while the rotary forging process , when a deformation amount exceeds 20% of tungsten alloy scrap rate will be greatly increased, the maximum amount of cyclic deformation rarely more than 70% , or material is easily damaged; Third , hydrostatic extrusion due to material in the deformation process is always in good lubricating conditions , small friction during the extrusion process , material deformation uniformity, large deformation makes the material extruded core part and the edge of the mechanical properties of the difference is small . Therefore, the hydrostatic extrusion process is a tungsten alloy is currently the most effective one strain hardening process . Usually sintered 93 static tensile strength of tungsten alloy 900-950MPa, elongation of 20% -30% , showing the strength of the alloy after strain hardening has been greatly improved, but reduced ductility . In the same deformation conditions, hydrostatic extrusion tungsten alloys uniform hardness uniformity, strain hardening effect is significantly better than conventional swaging process . With hydrostatic extrusion deformation increases, the enhanced role of strain hardening , strength of the material also increases, plasticity decreased , mainly due to hydrostatic extrusion process allows to obtain fibrosis tungsten alloy microstructure , thus greatly improving the strength of the alloy , and as to the plastic lower work hardening .

Hydrostatic extrusion deformation strengthening possesses such good advantage , mainly due to the hydrostatic extrusion process, the workpiece deformation at high risk of three surrounded by the compressive stress , which makes the internal organization of tungsten alloy material with the inherent microcracks and continuous extrusion process for healing to occur , and ultimately cause the material to reduce internal defects deformation strengthening the role and play . In addition, the hydrostatic extrusion process, due to the lubricating effect of high-pressure liquid material to be extruded so that the surface and the inner wall of the extrusion die to reduce friction , under the condition at higher speeds , once the formation of hydrodynamic lubrication , between the frictional shear force will be reduced to a minimum ( friction coefficient can be reduced to 0.005% -0.008 % ) , which greatly reduces the deformation of the tungsten alloy surface cracks and defects.




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Tungsten is a brittle metal with a very high melting point. Out of all of the elements only carbon has a higher melting point, and tungsten's melting point is higher than 3300 degrees Celsius. Tungsten is also very hard and scratch-resistant, and metal tungsten rings are very popular. Many men wear them as their wedding rings because they don't scratch and always look new. There are a variety of types of metal tungsten.

Pure Metal Tungsten
Tungsten is element W on the periodic table. It has an atomic weight of 183.84 and its atomic number is 74. It has the highest melting point of any metallic element. In its pure form, it is light gray or white and very brittle. It can be cut with a simple saw or formed into various shapes. Because of this, and its high melting point, tungsten is used in the filaments of a variety of light emitting products such as light bulbs and televisions. Pure metal tungsten is generally obtained from wolframite and scheelite, a mineral. The process by which tungsten is extracted from wolframite was pioneered by two Spanish chemists and mineralogists in 1783.

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Cold , forged While increasing the yield strength and tensile strength , but reduces the ductility of the alloy . When the forging deformation of 30 % or more micro-cracks occur material , ductility and toughness dramatically. And when high levels of tungsten alloy , the alloy is less able to withstand the cold deformation . In order to make a high tungsten content alloys with high deformation capacity , while not causing damage to the material , therefore, developed a new thermal machining technology . Thermomechanical processing technique is characterized in that in the deformation process of the tungsten alloy is heated , the deformation at a certain temperature , a large amount of deformation , than the amount of deformation of hydrostatic extrusion is much larger ( up to 95% or more ) , and the good ductility of the alloy . Thermo-mechanical processing technologies including hot extrusion, hot-rolled and hot extruded, hot deformation with forged composite technology .

Hot Extrusion and Hot Extrusion - Forging Complex Deformation Process

Hot extrusion technique is improved by cold extrusion technology to produce a new advanced deformation process , its high density tungsten alloy preparation of large deformation strength , ductility and toughness are very good high-toughness tungsten alloy has a great location , and its working principle and roughly the same hydrostatic extrusion , hot extrusion is different working environment temperature , using the working medium from the pressure in the extrusion process transmission and lubricating effect , the working medium of a direct selection affect the stability of fluid lubrication layer formation , is generally used as a mixture of the working medium , such as graphite - a mixture of glass , when the glass is in a molten state, the media can satisfy hydrostatic extrusion on the lubrication requirements of the medium with the appropriate viscosity can form a good dynamic lubrication layer , a good solution to the problem of mold and prevent seal leakage of lubricating medium . As hot extrusion technology is at a relatively high temperature, so a greater amount of deformation processing , strengthening effect greater inhomogeneity is small, and a small pressing pressure cold extrusion , extending the service life of the mold .

Hot Deformation Process

Hot-rolled or hot - forging deformation of the composite thermal process deformation of another process . Deformation under heating , rolling and intermediate annealing after many , finally rolled into desired size and performance requirements of the material. On the brittleness of tungsten alloy materials, especially brittle solid-phase sintering of tungsten alloys, pure tungsten and tungsten - copper composite materials using this deformation process to improve the ductility and strength of materials particularly advantageous that the process of large deformation , mainly for the tungsten alloy material deformation processed into thin , thin slices. The tungsten content is low ( 70% -80% ) of the tungsten alloy , the tungsten content is low , liquid phase sintering is difficult to control to obtain a uniform thickness can be rolled bar . The alloy by solid phase sintering , and hot rolling , the alloy can 30070-35 % elongation , after rolling, can be a sheet having a thickness of 0.15mm thick .




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Tungsten carbide has become increasingly popular and in high demand throughout the decades, now presently producing up to almost 30,000 tons annually.

The Present Day
Isostatic pressure sintering, led to the development of tungsten which was even harder than before. Tungsten is used in tools, mining, weaponry and even jewelry.

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