Effect of Rotary Swaging on the Mechanical Properties of 90W-7Ni-3Fe High-Density Tungsten Alloy
摘要
The objective of this study was to enhance the comprehensive performance of tungsten alloys through the rotary swaging strengthening process. A series of mechanical property evaluations, including tensile, compressive tests, and heat treatments, were carried out on 90W-7Ni-3Fe alloys obtained at different rotary swaging parameters (rotary swaging temperatures: 850, 900, 950, 1000 °C; rotary swaging deformation: 19, 31, 41, 56%). The experimental results demonstrate that the strength and Rockwell hardness of 90W-7Ni-3Fe alloy after rotary swaging deformation are significantly increased. The ultimate tensile strength reaches approximately 1227 MPa, and the elongation achieves 7%. Both under room temperature quasi-static compression and dynamic compression conditions, the rotary swaged 90W-7Ni-3Fe alloys show significant strain rate sensitivity. Notably, during dynamic compression at a strain rate of 2300 s−1, an adiabatic shear band structure of 20-30 μm is observed. Even under a larger amount of rotary swaging deformation, the rotary swaged 90W-7Ni-3Fe maintains commendable impact toughness. After heat treatment, the ultimate tensile strength of the rotary swaged 90W-7Ni-3Fe alloys reaches up to about 1212 MPa, and the elongation improves to 13.7%, achieving an optimal balance between strength and plasticity.