Abstract
There are two sorts of hard spot which appears in the products of die-casting, one is of metallic and the other of non-metallic nature. The former is chiefly of primary crystals of various intermetallic compounds containing iron and manganese, as shown in Table. 1 and Photo. 1, a-h.The latter or hard spot of non-metallic nature has also been detected in some products of diecasting (Photo. 4-Photo. 8), as the causes of which the reaction products between the material of crucible or fire-clays and the molten alloy as well as the slag itself contained in the crude silicon have been pointed out.Some remedies according as the causes of hard spot have been suggested.
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