Deformation Strengthening Research with Tungsten Alloy

High density tungsten alloy shells require both high strength and good toughness at ensuring high density premise. Therefore, in order to further improve the strength and toughness of tungsten alloy, tungsten alloy deformation strengthening the need for in-depth study.

Currently, the tensile strength was prepared using powder metallurgy high density tungsten alloy (sintered) is generally up to 900MPa ~ 1 000 MPa, elongation between 20%~ 30%; but after plastic deformation strengthening, its strength can be greater margin improved plasticity declined. After plastic deformation, tungsten alloy strength can be more than 1400 MPa, elongation can be maintained at about 10%.

Rolling, rotary forging, torsional deformation, deformation strengthening hydrostatic extrusion and other materials to improve the strength of the alloy of tungsten are the effective way to ensure a certain toughness, but also effective grain refinement. Forging deformation is used to improve the strength of tungsten alloy , conventional deformation is about 15. Strength of tungsten alloys increases with the amount of deformation increase, the greater the amount of deformation of tungsten particles greater degree of deformation, and the deformation degree increase would result in fracture transfer to tungsten particles. Rolling may also be a larger amount of deformation of the deformation and to ensure uniformity, and to make a large grain broken into small grains, and with a uniform distribution of the microstructure; rolling can increase the density and reduce the void tungsten rod , improve production efficiency and reduce manufacturing costs. Rotary forging effect can improve the strength and armor-piercing tungsten alloy, after multiple passes swaging, the mechanical properties of strength and hardness of tungsten alloys have relatively spin before forging a more substantial increase, but the elongation decreases. Hydrostatic extrusion technology is a hard plastic deformation of materials processing technology, the main sub-cool liquid extrusion and hot hydrostatic extrusion, it is one of the most effective tungsten alloy deformation strengthening the current method, it has a deformed to obtain more a large amount of deformation characteristics and can greatly improve the strength of the material.


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