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| INFLUENCE OF HIGH TEMPERATURE THERMOMECHANICAL TREATMENT ON STRUCTURE AND PROPERTIES OF AN IRON-NICKEL SUPERALLOY |
| Zhang Yongchang and Yang Qibin(Institute of Metal Research; Academia Sinica) |
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Cite this article:
Zhang Yongchang and Yang Qibin(Institute of Metal Research; Academia Sinica). INFLUENCE OF HIGH TEMPERATURE THERMOMECHANICAL TREATMENT ON STRUCTURE AND PROPERTIES OF AN IRON-NICKEL SUPERALLOY. Acta Metall Sin, 1981, 17(1): 83-128.
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Abstract An iron-nickel base superalloy (Fe-35Ni-15Cr-2.7Al-2.5Ti-2W-2Mo) was subjected to high temperature thermomechanical treatment (HTMT) at 900, 1000 and 1100℃. The mechanical properties were evaluated. Results indicate that substantial improvement in tensile and yield strength, ductility and notch toughness can be accomplished by HTMT. Under testing temperature of 650℃, the stressrupture life of 1100℃ thermomechanically treated superalloy is not lower even than that after conventional normal heat treatment. In particular, the influence of deformation temperature on the structure and the mechanical properties of the superalloy was studied by both optical and electron microscopy. It is clarified that the strengthening mechanism caused by HTMT under various temperatures may be grain refinement, cross slip, sawtoothed grain boundaries, precipitation along grain boundaries and dislocation substructure formation.
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Received: 18 January 1981
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[1] #12
[2] Hotzler, R. K., Maciag, R. J., Fischer, G. J. and Troc, E., Met. Trans.,1(1970) , 963．
[3] Kear, B. H., Oblak,J. M. and Owczarski, W. A.,J. Metals, 24(1972) , № 6, 25．
[4] #12
[5] #12 |
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