. Transactions . t 10 inches in diameter. Each white portion was, there-fore, a complete ring surrounded by soft gray iron. An analysis gave for the total C, ; graphitic C, ;combined C, ; Si, ; and for the white: total C, ;graphitic C, ; combined C, ; Si, 2,742; Mn, shows that the silicon is practically uniform throughout thecasting, and that at certain temperatures the carbon will take thecombined form, and at others the graphitic form, independently ofeither temperature or silicon content. We herewith give a number 618 THE PHYSICS OF ST
. Transactions . t 10 inches in diameter. Each white portion was, there-fore, a complete ring surrounded by soft gray iron. An analysis gave for the total C, ; graphitic C, ;combined C, ; Si, ; and for the white: total C, ;graphitic C, ; combined C, ; Si, 2,742; Mn, shows that the silicon is practically uniform throughout thecasting, and that at certain temperatures the carbon will take thecombined form, and at others the graphitic form, independently ofeither temperature or silicon content. We herewith give a number 618 THE PHYSICS OF STEEL. of sections of castings, all of the true size, showing stratification orsegregation in various forms. Figures marked a show the fractureat the center of a test-bar one foot long and one-half inch marked b show the end of the same bar, with the side brokenaway, showing the depth and character of the chill. Those marked c are cross-fractures at the center of a bar with 3 9 7. C. 3 9 7. t. 3Qfe. the section shown and one foot long. The bar is run from one end,and the stratification extends nearly or entirely the length of the marked d are cross-fractures of a bar 1 inch by ^ inch and12 inches long, run from two gates on one side. The stratificationis influenced by the gates. No. 208 d shows a fracture through the gate, and it would be thesame for 209 e, and it would be the fracture if made between thegates of 210 e and 211 e. The drawings 210, 211 and 212 showthe structure of these thin test-bars viewed from the flat surface. THE PHYSICS OF STEEL. 619
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
