Effect of rotary swaging deformation on microstructure and mechanical properties of tungsten alloys

Abstract

The 93WNiFe alloys were deformed by rotary swaging process to obtain the high-performance tungsten alloys. The effect of rotary swaging deformation on the mechanical properties and microstructure of the 93WNiFe tungsten alloys were studied. The results show that, with the increase of deformation, the W grains in 93WNiFe tungsten alloys are elongated from spheroid to long strip, the tensile strength at room temperature increases from 982 MPa to 1622 MPa, and the elongation decreases from 35.5% to 5.5%. When the deformation of rotary swaging is less than 15%, the Rockwell hardness of the 93WNiFe alloys increases rapidly and the impact toughness decreases rapidly at room temperature with the increase of deformation. When the deformation is greater than 15%, the Rockwell hardness increases slowly, and the impact toughness decreases slowly at room temperature. When the deformation is 30%, the maximum Rockwell hardness is HRC 47.2, and the minimum impact toughness at room temperature is 30.80 J·cm−2. There are a small number of W grain cleavage fractures, a large number of W–bond phase interface fractures, W–W interface fractures, and binder phase dimple fractures in the sintered 93WNiFe alloys without deformation. With the increase of deformation, the number of W grain cleavage fractures increases gradually, and the number of W–bond phase interface fractures, W–W interface fractures, and binder phase dimple fractures decrease gradually.

Keywords

• tungsten alloys
• rotary swaging
• deformation
• mechanical properties
• fracture morphology