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| FORMATION OF μ-PHASE AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST NICKEL-BASE SUPERALLOYS |
| Cai Yulin; Zheng Yunrong (Institute of Aeronautical Materials; Beijing) |
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Cite this article:
Cai Yulin; Zheng Yunrong (Institute of Aeronautical Materials; Beijing). FORMATION OF μ-PHASE AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST NICKEL-BASE SUPERALLOYS. Acta Metall Sin, 1982, 18(1): 30-122.
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Abstract Studies were made of the formation and chemical composition of precipitated plate like μ-phase as well as its effect on the TTT curve, fracture feature and mechanical properties of cast nickel base superalloy. It was found that the temperature of formation of plate like μ-phase is within wide range from 800 to 1140℃. Its baseplane is parallel to the hexagonal plane {0001}. It precipitates from plane {111} of γ-matrix. The cleavage fracture feature under impact, tensile and stress tests below 760℃ appears along baseplane {0001} of μ-phasc. For the superalloy containing 1—1.5 wt-％ μ-phase, the impact value at 20℃, the stress rupture life and the tensile ductility at 20℃ and 760℃ decrease obviously, but the stress rupture ductility increases distinctly, especially under elevated temperatures. The (?)_v value seems to be not the only factor to control the μ-phase formed, and yet to relate to both (Mo+W) at.-％ and Mo/(Mo+W). Besides, the boron content may also be effective to retard its formation.
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Received: 18 January 1982
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1 郭可信,金属学报,14(1978) ,87．
2 Woodyatt, L. R.; Sims, C. T.; Beattie, H. J. Jr., Trans. Metall. Soc. AIME, 236 (1966) , 519．
3 Dreshfield, R. L.; Wallace, J. F., NASA CR-120940, 1972, p. 1．
4 Sims, C. T.; Hagel, W. C., The Superalloys, Eds. Smis, C. T., Hagel, W. C., Wiley, New York, 1972, p. 259． |
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