Comparison of Mechanical Properties and Damage Mode of Tungsten Alloy Spheres in Two Different States
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摘要: 采用静态与动态加载试验的方法，研究了同一牌号、相同尺寸的烧结态与精磨态两种状态的钨合金球的力学性能。同时通过电镜扫描的手段，观察了两种状态的钨合金球试验前表面与内部金相结构及静态试验后表面的损伤模式，并分析了两种状态钨合金球产生力学性能差异的原因。研究结果表明：烧结态钨合金球表面因其钨颗粒与黏结相分布均匀，静态条件下其极限压溃载荷是精磨态钨合金球的2.02倍，动态条件下其性能也明显优于精磨态钨合金球。Abstract: In this paper, we studied the mechanical properties of tungsten alloy spheres in sintered and polished states using the quasi static test and the dynamic loading test, observed their metallographic structure and damage mode before and after the test using SEM, and analyzed the causes leading to their difference.The result showed that the surface microstructure of the tungsten alloy sphere in the sintered state was more uniform than that in the polished state, which accounts for its better mechanical properties.
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Key words:
- tungsten alloy sphere /
- mechanical properties /
- damage mode /
- SEM
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图 7 静态试验后钨合金球表面裂纹电镜结果
Figure 7. Result of SEM on surface crack of tungsten alloy spheres after quasi-static loading test
图 8 钨合金球精磨加工示意图
Figure 8. Schematic diagram of lapping process on tungsten alloy sphere
表 1 钨合金球化学成分
Table 1. Chemical composition of tested tungsten alloy spheres (%)
Ni Fe Co W 4.3 2.2 0.4 93.1 
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表 2 参试钨合金球外径尺寸
Table 2. Diameter of tested tungsten alloy spheres
State Diameter/mm No.1 No.2 No.3 No.4 No.5 No.6 Sintered 7.00-7.09 7.01-7.04 7.00-7.08 7.02-7.10 7.01-7.04 7.03-7.09 Polished 7.00-7.02 7.00-7.01 7.00-7.01 7.00-7.01 7.00-7.02 7.00-7.01
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表 3 静态加载试验结果
Table 3. Results of quasi-static test
State No.1 No.2 No.3 Crushing load/kN Deformation/% Crushing load/kN Deformation/% Crushing load/kN Deformation/% Sintered 157 66.54 163 67.01 155 65.86 Polished 77 50.39 85 51.05 73 51
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表 4 动态加载试验钨合金球触靶速度
Table 4. Terminal velocity of tungsten alloy spheres
State Terminal velocity/(m·s-1) No.4 No.5 No.6 Sintered 468 492 446 Polished 430 447 506
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