Abstract
The interaction of carbon, boron and sulphur atoms was studied through observation of the amount, shape and distribution of carbides, borides and sulphides at grain boundary surfaces in superalloys by means of transmission electron microscopy.Carbon, boron and sulphur atoms segregate towards grain boundaries and can form compounds there. The increases in tendency to segregate are arranged in the order C, Band S, and the B (or S) may force the C (or B) atoms out of grain boundaries. When B (or S) content was not high, with the C (or B) content being increased, the amount and size of borides (or sulphides) were decreased while the amount and size of carbides (or borides) increased gradually. It is shown that the C (or B) atoms, which segregate towards grain boundaries, can slow down the diffusion speed of the B (or S) atoms at the grain boundaries. The temperature of M3B4 precipitation was lower than that for M23B6 at grain boundaries in the superalloy. It is shown that the interaction of C and B atoms may depend on ageing temperature.
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