ON THE PRIMARY η-PHASE IN HIGH-Ti Ni-Fe-Cr BASED SUPERALLOY

Acta Metall Sin

1991, Vol. 27

Issue (6): 27-32 DOI:

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ON THE PRIMARY η-PHASE IN HIGH-Ti Ni-Fe-Cr BASED SUPERALLOY

GUO Shouren; LU Dezhong Institute of Metal Research; Academia Sinica; Shenyang

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GUO Shouren; LU Dezhong Institute of Metal Research; Academia Sinica; Shenyang. ON THE PRIMARY η-PHASE IN HIGH-Ti Ni-Fe-Cr BASED SUPERALLOY. Acta Metall Sin, 1991, 27(6): 27-32.

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Abstract The precipitation and dissolution together with their control of the primary η-phase in the high-Ti Ni-Fe-Cr based superalloy have been investigated. The precipitation of primary η-phase is found to be related closely to Ti or Al content and solidificaion rate of the alloy. Collection of block η-phase may remarkably reduce the tensile strength, ductility and rupture life of the alloy. The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lg t for as-cast superalloy.The formation of primary η-phase may be prevented by reasonable control of Ti or Al content and smelting process. The adoption of treatment under hot deformation and homogenization may be the remedy for unfavourable influence of η-phase.

Key words: superalloy primary η-phase Ti homogenization

Received: 18 June 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I6/27

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