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The precipitation and transformation of secondary carbides in a newly developed 16Cr–1Mo–1Cu cast... more The precipitation and transformation of secondary carbides in a newly developed 16Cr–1Mo–1Cu cast iron subjected to a destabilization heat treatment was investigated. The results showed that the initial fine secondary carbide precipitation from the austenite matrix consist of (Fe,Cr) 23 C 6. Two kinds of (Fe,Cr) 23 C 6 carbides initially precipitated: one is cubic with a cube–cube orientation relationship with the austenite matrix, and the other is grainy with no orientation relationship with the matrix. The latter carbide may be precipitated in the cooling process after a destabilization treatment. With prolonged holding time, the fine (Fe, Cr) 23 C 6 carbides have transformed into M 7 C 3 rods with an orientation of [100] (Fe,Cr)23C6 z[100] (Fe,Cr)7C3 and (01 ¯5) (Fe,Cr)23C6 z (010) (Fe,Cr)7C3 between the M 23 C 6 and M 7 C 3 carbides.
The precipitation and transformation of secondary carbides in a newly developed 16Cr–1Mo–1Cu cast... more The precipitation and transformation of secondary carbides in a newly developed 16Cr–1Mo–1Cu cast iron subjected to a destabilization heat treatment was investigated. The results showed that the initial fine secondary carbide precipitation from the austenite matrix consist of (Fe,Cr) 23 C 6. Two kinds of (Fe,Cr) 23 C 6 carbides initially precipitated: one is cubic with a cube–cube orientation relationship with the austenite matrix, and the other is grainy with no orientation relationship with the matrix. The latter carbide may be precipitated in the cooling process after a destabilization treatment. With prolonged holding time, the fine (Fe, Cr) 23 C 6 carbides have transformed into M 7 C 3 rods with an orientation of [100] (Fe,Cr)23C6 z[100] (Fe,Cr)7C3 and (01 ¯5) (Fe,Cr)23C6 z (010) (Fe,Cr)7C3 between the M 23 C 6 and M 7 C 3 carbides.