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| Formation of Primary M6C Carbide and Its Effect ON Cast Die Superalloys with High Content of Tungsten |
| ZHENG Yunrong; ZHENG Liang; ZENG Qiang; RUAN Zhongci |
| Beijing Institute of Aeronautical Materials |
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Cite this article:
ZHENG Yunrong; ZHENG Liang; ZENG Qiang; RUAN Zhongci. Formation of Primary M6C Carbide and Its Effect ON Cast Die Superalloys with High Content of Tungsten. Acta Metall Sin, 2004, 40(3): 285-290 .
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Abstract Nickel based superalloys with high content of tungsten (W) have been applied to cast the large
size die. Because the formation of large amount of primary M 6 C phase embrittles the die, it
is necessary to explore the forming condition of primary M 6 C. The experiments prove that the alloys containing carbon content higher than 0.15% (mass fraction) tend to precipitate primary M 6 Ccarbide and 10% Co can restrict the formation of M 6 C effectively. The primary M 6 C forms at 1375℃. The cooling rate between the solid and liquid temperature range can influence the precipitation of this phase sensitively. Rapid cooling retard the formation of M 6 C obviously. The section size effect of the formation of M 6 C exists in castings. For a heavy section possessing dendrite spacing higher than 150m, it is very easy to form M 6 C with a millimeter magnitude, which damages the high temperature strength of alloys. To prevent the precipitation of M 6 C in large size section die, the composition of alloy is recommended to maintain at the level of 0.04%---0.07% C and 10%---15% Co.
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Received: 31 March 2003
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