Transactions . The annealing was done at a temperature of 820° C. and atthe same time that the bars were annealed for the annealed tensiletest pieces. The etching agent employed was a 10 per cent, solutionof concentrated nitric acid in absolute alcohol. In the case of someof the higher-copper alloys a subsequent application of a saturatedsolution of iodine in absolute alcohol was necessary. The specimenswere polished and etched and the photographs were taken by H. in the laboratory of Sauveur & Boylston, Cambridge, Mass. Upon examination of the micrographs, Figs. 6 to 21, it will be
Transactions . The annealing was done at a temperature of 820° C. and atthe same time that the bars were annealed for the annealed tensiletest pieces. The etching agent employed was a 10 per cent, solutionof concentrated nitric acid in absolute alcohol. In the case of someof the higher-copper alloys a subsequent application of a saturatedsolution of iodine in absolute alcohol was necessary. The specimenswere polished and etched and the photographs were taken by H. in the laboratory of Sauveur & Boylston, Cambridge, Mass. Upon examination of the micrographs, Figs. 6 to 21, it will be seenthat in the case of the unannealed specimens the ferrite is permeatedwith filaments of cementite more or less in proportion as the percent-age of copper increases. Larger patches of free ferrite appear in thespecimens with decreasing copper content and the pearlite is less 22 Journal of Industrial and Engineering Chemistry, vol. v., No. 6, p. 458 (June, 1913). 536 THE INFLUENCE OF COPPER UPON Fig. 6.—Specimen AO. X 100.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
