. Transactions. .S^ Fig. 12.—Surface chaxges produced in low-carbon steel by heating above THE ACi TRANSFORMATION. ThE SPECIMEN HAD BEEN USED FOR A SERIES OF THERMALCURVES AND WAS HEATED FOUR TIMES TO 950° C, , .\BOVE THE Ad TRANSFORMATIONtemperature; the total period ABOVE THIS TEMPERATURE WAS 4 HR. ThE SPECI-MEN WAS TREATED AS FOR FiG. 13, WITH WHICH THIS FIGURE SHOULD BE COMPARED. Etching, 2 per cent, alcoholic nitric acid. Carbonless surface Average structure of the central portion. 430 MICROSTRUCTURE OF IRON AND MILD STEEL AT HIGH TEMPERATURES

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries