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对烧结态93W-4.9Ni-2.1Fe合金进行不同变形量旋转锻造,研究变形量对钨合金微观组织及绝热剪切敏感性的影响。微观组织观察结果表明,旋转锻造形变后钨颗粒沿变形方向被拉长为椭球形,随变形量由3.45%增加至42.11%,钨颗粒变形程度加剧,长径比由1.32增加至2.41;位于钨颗粒间的粘结相则沿变形方向逐渐拉长为细长的条状组织。对不同变形量的旋转锻造钨合金,沿棒料径向取样进行动态压缩试验后发现:当变形量增加至15.84%(钨颗粒长径比1.47)时,旋转锻造钨合金塑性变形方式发生改变,合金中开始出现绝热剪切现象;此后,随旋转锻造变形量(钨颗粒长径比)的增加,旋转锻造钨合金中绝热剪切带宽度减小,合金绝热剪切敏感性增大。随旋转锻造变形量(钨颗粒长径比)的增大,合金应变硬化能力减小,同时动态加载时绝热温升数值增大,软化效应增强,这是旋转锻造钨合金绝热剪切敏感性随变形量(钨颗粒长径比)增加而增大的主要原因。
The effects of deformation on the microstructure and adiabatic shear susceptibility of tungsten alloy were studied by rotating forging of 93W-4.9Ni-2.1Fe alloy under different deformations. The results of microstructure observation showed that the tungsten particles elongated into ellipsoid along the deformation direction after deformation by rotating forging, the deformation degree of tungsten particles increased from 3.45% to 42.11%, the deformation degree of tungsten particles increased and the aspect ratio increased from 1.32 to 2.41; Particles between the adhesive phase along the deformation direction gradually elongated elongated strip of tissue. The results of dynamic compression tests of radial forging samples with different deformations show that when the deformation is increased to 15.84% (the aspect ratio of tungsten particles is 1.47), the plastic deformation mode of the forging tungsten alloy changes. After that, the adiabatic shear band began to appear in the alloy, and then the adiabatic shear band width decreased and the adiabatic shear sensitivity of the alloy increased with the increase of the rotational forging deformation (the aspect ratio of tungsten particles). With the deformation of the rotating forging (tungsten particles aspect ratio) increases, the ability of the alloy strain hardening decreases, while the dynamic loading increases the value of adiabatic temperature, the softening effect increases, which is the rotary forging tungsten alloy adiabatic Shear sensitivity Deformation (tungsten particle aspect ratio) increases and increases the main reason.