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本文研究了液相烧结钨基高比重合金(95W-3.5Ni-1.5Fe)在不同真空处理制度下室温拉伸性能和断裂韧性值K_(Je)的关系。结果表明真空处理温度的升高,室温拉伸性能σ_b、δ和断裂韧性值K_(1c)都明显增加。显示了口σ_b,δ和K_(1c)随真空处理温度变化的一致性。本文讨论了真空处理后,合金的室温拉伸性能σ_b、δ和断裂韧性值K_(1c)的变化规律及其内在原因。还进一步阐明了合金力学性能的改善是由于聚集在W颗粒和粘结相介面的氢含量减少,从而提高了W颗粒和粘结相的结合力所致。最后还讨论了断裂韧性测试中,预制疲劳裂纹以及求裂纹平均长度α的问题。
In this paper, the relationship between the tensile properties and the fracture toughness K_ (Je) at room temperature under different vacuum treatment was studied for the liquid-phase sintered tungsten-based high specific gravity alloy (95W-3.5Ni-1.5Fe) The results show that the tensile strength σ b, δ and the fracture toughness value K_ (1c) both increase obviously under the vacuum treatment temperature. The consistency of σ_b, δ and K_ (1c) with the temperature of vacuum treatment is shown. In this paper, the rules of the tensile properties σ b, δ and the fracture toughness K_ (1c) at room temperature after vacuum treatment are discussed, and their internal causes are discussed. It is further clarified that the improvement of the mechanical properties of the alloy is due to the reduction of the hydrogen content accumulated on the interface between the W particles and the binder phase, thereby increasing the binding force between the W particles and the binder phase. Finally, the fracture toughness test, the prefabricated fatigue crack and crack average length α problem.