热挤压钨合金的组织性能研究

Microstructure and Properties of Tungsten Heavy Alloy by Hot Extrusion

对95W合金进行热挤压形变强化,分别沿挤压棒材轴向和径向进行静态、动态力学性能对比研究,并对测试后的试样进行显微组织和断口分析。结果表明,动态加载下纤维组织力学性能各向异性显著,沿纤维轴向具有较高的塑性,低的屈服强度;沿径向具有较低的塑性和高的屈服强度。分析表明,剪切破坏是导致动态加载下径向与轴向性能显著差异的主要原因,据此提出了将热挤压与扭转变形相结合,提高钨合金穿甲自锐化能力的新途径。

The static and dynamic mechanical properties are studied and compared along the axial and radial directions for the 95W-3.4Ni-1.6Fe （WHA） rod by hot extrusion process, respectively, and the microstructures are analyzed by EBSD in order to research the effect of tungsten fiber on the penetration properties. The results shows that the dynamic mechanical properties of WHA alloy produced by hot extrusion exhibit notable anisotropism with relatively high ductility and relatively low yielding strength along the axial direction of fiber; while relatively low ductility and relatively high yielding strength along the radial direction. The microstructure shows that the shear fracture is the main reason for the difference of the dynamic mechanical properties between radial and axial direction. Therefore, a new way to improve the self-sharpening performance is bring forward by putting the hot extrusion and torsion together for WHA.