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| EFFECT OF Co ON HIGH-TEMPERATURE STRENGTH OF γ'-PRECIPITATED Ni-BASE ALLOYS |
| by YANG Zhi'an; XIAO Yaotian; SHI Changxu (C. H. Shih) (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 8 June; 1982; revised manuscript 21 November; 1982) |
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Cite this article:
by YANG Zhi'an; XIAO Yaotian; SHI Changxu (C. H. Shih) (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 8 June; 1982; revised manuscript 21 November; 1982). EFFECT OF Co ON HIGH-TEMPERATURE STRENGTH OF γ'-PRECIPITATED Ni-BASE ALLOYS. Acta Metall Sin, 1983, 19(4): 48-56.
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Abstract 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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Received: 18 April 1983
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