ROLE OF B AND C IN A Ni-Fe-Cr BASE SUPERALLOY

Acta Metall Sin

1988, Vol. 24

Issue (3): 206-212 DOI:

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ROLE OF B AND C IN A Ni-Fe-Cr BASE SUPERALLOY

GUO Shouren;LU Dezhong;FAN Heming Institute of Metal Research; Academia Sinica; Shenyany

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GUO Shouren;LU Dezhong;FAN Heming Institute of Metal Research; Academia Sinica; Shenyany. ROLE OF B AND C IN A Ni-Fe-Cr BASE SUPERALLOY. Acta Metall Sin, 1988, 24(3): 206-212.

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Abstract The effects of B and C content on the mechanical properties and mi-crostructures of a Ni-Fe-Cr base superalloy have been investigated. It has beenfound that the role of B in strengthing the grain boundaries is much stronger thanthat of C. Both the B dissolved in matrix and precipitated as boride along thegrain boundaries increase the stress rupture properties of the alloy markedly. Ad-dition of B improves the structure of grain boundaries, suppresses the precipitationof η phase and raises the stability of microstructure of the grain boundaries in thealloy. Addition of either B or C does not effect the tensile strength obviously butincrease the tensile ductility of the alloy. In order to obtain the optimum tensile properties, the minimum contents of Band C should be 0.002 and 0.02% respectively.

Key words: superalloy microstructure property

Received: 18 March 1988

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1988/V24/I3/206

1 Sullivan C P, Donachie M J Jr. Met Eng Q, 1971; 11(4) : 1
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