Intergranular fractures in steel castings are described which are associated with neither of the usual causes of embrittlement, i.e. the precipitation of aluminium nitride or Type II manganese sulphide. Instead, it is shown that the intergranular failures are caused by a combination of phosphide film formation and solid-phase precipitation of manganese sulphide at the austenite grain boundaries. These phenomena are familiar in steel forgings but have not previously been associated with castings.
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