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| THE EFFECT OF ALUMINIUM AND TITANIUM ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AN IRON-BASE ALLOY |
| Res. Gp. of Iron-base Superalloy(Institute of Metal Research; Academia Sinica) |
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Cite this article:
Res. Gp. of Iron-base Superalloy(Institute of Metal Research; Academia Sinica). THE EFFECT OF ALUMINIUM AND TITANIUM ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AN IRON-BASE ALLOY. Acta Metall Sin, 1978, 14(3): 227-324.
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Abstract In the case of a 35Ni-15Cr type iron-base superalloy, in which phases such as γ′-Ni_3(Al, Ti), M_3B_2, TiC, Y-Ti_2SC, β-NiAl, α-Ni_2AlTi, η-Ni_3Ti, σ and Laves, may be present, total amount of aluminium and titanium and the ratio (Ti/Al) in the alloy exerted marked influences upon these phases. It is found that the variation of Al+Ti contents may change the weight fraction, the size and the chemical composition of γ′-phase and γ-γ′ mismatch, as well as the microstructure of the alloy after prolonged exposure at 800℃ for 500 hrs and at 700℃ for 5000 hrs. The ratio Ti/Al, however, affected the γ-γ′ mismatch and the chemical compositions of γ′-phase, but not the weight fraction and size of γ′-phase. It was observed that either σ or Laves phase was present after prolonged exposure at 800℃ and 700℃ if Al+Ti content of the alloy exceeded 5 or 4% respectively. The tensile properties at room temperature and at 650℃, the stress-rupture properties at 750℃, the tensile properties after prolonged exposure at 700℃ all showed a change of the mechanical properties of the alloy commensurate with the microstructutre aforementioned.
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Received: 18 March 1978
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[1] 郭建亭等,铬和硅对一种35Ni-15Cr型铁基高温合金力学性能和组织结构的影响,待发表.
[2] 郭建亭等,金属学报,10(1974) ,74．
[3] Raynor, D. and Silcock, J. M., Metal Sci. J., 4 (1970) , 121．
[4] Brown, L. M. and Ham, R. K., Strengthening Methods in Crystals, ed. by A. Kelly and R. B. Nicholson, Elsevier, Amsterdam, (1971) , pp. 10-135． |
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