Tungsten Alloy Strain Hardening Technology Quiet Night Extrusion Technology

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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