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| FORMATION OF (γ+γ') EUTECTIC AND CONTROL OF σ-PHASE IN A HIGH Al-Ti CAST Ni-BASE SUPERALLOY |
| ZHU Yaoxiao; XU Leying; ZHAO Hong'en; TONG Yingjie; SHI Changxu (Institute of Metal Research; Academia Sinica; Shenyang) |
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Cite this article:
ZHU Yaoxiao; XU Leying; ZHAO Hong'en; TONG Yingjie; SHI Changxu (Institute of Metal Research; Academia Sinica; Shenyang). FORMATION OF (γ+γ') EUTECTIC AND CONTROL OF σ-PHASE IN A HIGH Al-Ti CAST Ni-BASE SUPERALLOY. Acta Metall Sin, 1986, 22(2): 5-143.
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Abstract An investigation was made of the various phases formed in what order and composed under different temperatures during the process of solidification and segregation of alloying elements in a high Al-Ti cast Ni-base superalloy. The formarion of (γ+γ') eutectic and the control of σ-phase precipitation have been discussed. During solidification of the alloy, the dendritic segregation of Al and V is almost unespied, and of Ti, Cr and Mo is positive, especially, Ti being the most serious. This may impel the formation of segregation zone at eutectic reaction and the enrichment with σ- phase forming elements, e.g. Cr, Mo and Co, in the remainder liquid. Thus the increasing of σ-phase transformation may be tended. However, the σ-phase may be avoided either by adjusting the ratio Al/Ti taking the advantage of the difference of the segregation behaviour of Al and Ti, or by controlling the cooling rate after casting.
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Received: 18 February 1986
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