Metallurgy; an introduction to the study of physical metallurgy . Fig. 124.—Diagram of Isothermalsat a Re-entrant Angle in a Cool-ing Casting. PLATE Fig. 122. Pig. 125. , 1 /.?;? ?C^v jfj ^\ r.^ »ff ^ -A mJNi te» ?vA) V V^ V \ \ ^ ,v# •is ii H > , %; ?-•. ?? ?T-.^lMi^B :nmiM\ Fig. 123. [2(i face p. 292. MECHANICAL TREATMENT OF METALS 293 draw the isothermals representing the cooling process—andtheir general outline can usually be inferred from the shapeand conditions of cooling of the casting in each particular case—vre know at once the direction in which fringe crystals willgrow
Metallurgy; an introduction to the study of physical metallurgy . Fig. 124.—Diagram of Isothermalsat a Re-entrant Angle in a Cool-ing Casting. PLATE Fig. 122. Pig. 125. , 1 /.?;? ?C^v jfj ^\ r.^ »ff ^ -A mJNi te» ?vA) V V^ V \ \ ^ ,v# •is ii H > , %; ?-•. ?? ?T-.^lMi^B :nmiM\ Fig. 123. [2(i face p. 292. MECHANICAL TREATMENT OF METALS 293 draw the isothermals representing the cooling process—andtheir general outline can usually be inferred from the shapeand conditions of cooling of the casting in each particular case—vre know at once the direction in which fringe crystals willgrow. The isothermals themselves practically indicate thesuccessive stages of sohdifioation, since the edge of the solidifiedportion at any moment is necessarily an isothermal—^viz., thatof the freezing-point. Strictly speaking, the arguments hereset forth apply only to the soUdification of a pure metal,every portion of which undergoes solidification at one tempera-ture ; in practice, however, the majority of alloys behavein a very similar manner. In the case of most solid solutionsthe freezing-range is short as compared with
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmetals, bookyear1922
