Tungsten Alloy Strain Hardening Technology Thermomechanical Processing Technology

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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