Metallurgy; an introduction to the study of physical metallurgy . ched steel is then ascribableto the presence of an extremely minute network of amorphouslayers. The amorphous material of these layers will not onlypossess the hardness of amorphous iron, but will be renderedstill harder by the presence of carbide in a high state of concen-tration. The minute a-crystals, as they are formed, mustreject the carbide which was present in solution in their y-ironmother-crystals and this carbide will be rejected into thesurrounding amorphous film. This film, being in characteridentical with the hquid
Metallurgy; an introduction to the study of physical metallurgy . ched steel is then ascribableto the presence of an extremely minute network of amorphouslayers. The amorphous material of these layers will not onlypossess the hardness of amorphous iron, but will be renderedstill harder by the presence of carbide in a high state of concen-tration. The minute a-crystals, as they are formed, mustreject the carbide which was present in solution in their y-ironmother-crystals and this carbide will be rejected into thesurrounding amorphous film. This film, being in characteridentical with the hquid phase, will take up all the carbidethat is thrown out, and wiU retain it on subsequent coolingand congeaUng, so that the crystals of a-iron will be surroundedby films—^not of amorphous iron, but of an amorphous iron-carbide solution. The amorphous theory as thus outlined,affords explanations of many of the more important phenomenaconnected with the behaviour of quenched steels and of alloysteels, but the matter cannot be pursued here, partly because PLATE Pig.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
