The Iron and steel magazine . Fig. 9 Fig. 10 286 The Iron and Steel Magazine From this meager data concerning the heat treatment ofboth kinds of the steel as represented by the two fractures it isnot difficult to deduce that (i) the steel was cooled slowly ina furnace or some other slow medium, (2) that in the same barthe points from which the cooling began varied greatly. There may be two explanations as to this condition. Thebar may have been unevenly hammered, or else, after it had beenpartly drawn, one end may have become too cold to work andhad to be reheated before finishing, producing a
The Iron and steel magazine . Fig. 9 Fig. 10 286 The Iron and Steel Magazine From this meager data concerning the heat treatment ofboth kinds of the steel as represented by the two fractures it isnot difficult to deduce that (i) the steel was cooled slowly ina furnace or some other slow medium, (2) that in the same barthe points from which the cooling began varied greatly. There may be two explanations as to this condition. Thebar may have been unevenly hammered, or else, after it had beenpartly drawn, one end may have become too cold to work andhad to be reheated before finishing, producing an unequal stateof crystallization. It will be noticed that in the micrographs in Figs. 3, 4, 5and 6 are black spots which might suggest bad places in theplate or bad work in the dark room, but it will be observed thatthese spots occur in Figs. 7, 8 and 9, which have receivedsome heat treatment. The etching from the piece of the bar from which Fig. 3 wastaken was removed by repolishing it and a micrograph made(x6o) of the unet
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
