本文以Udimet500合金为基,研究了不同Co含量对镍基高温合金的蠕变速率、蠕变激活能、持久性能及组织结构的影响。结果表明:在780—860℃范围内,稳态蠕变速率以10—15％Co的合金为好,持久断裂时间在15％Co时出现峰值。无Co合金有单一蠕变激活能值,含Co合金有两个蠕变激活能值,激活能转变温度随Co含量增加而提高。Co主要固溶在基体中,γ′相数量随Co含量变化较小;Co有抑制γ′相长大的作用。综合实验结果,提出了Udimet 500型合金降低Co含量的可能性。
The effect of Co on the steady-state creep rate, apparent creep activation energy, stress-rupture time and microstructure of Udimet 500 type alloy with Co content up to 25 wt-％ has been investigated. The results show that the steadystate creep rate of alloy containing 10-15％ Co is the lowest under temperatures from 780 to 860℃ and the stress-rupture time for alloy containing 15％ Co is maximum. The creep activation energy for alloy without Co is of unique value, for ones containing Co is of duplicate values, and its transition temperature increases with the increase of Co content in the alloys. Co is substantially dissolved in the matrix. The quantity of γ'-phase in the alloys is nearly unchanged with variation of Co contents which can retard the growth of γ'-phase. Thus, it is proposed that Co content in Udimet 500 alloy may be reduced to 10-15％ without any detrimental effect on its strength and hot corrosion properties at elevated temperatures.
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