. Transactions. Fig. 14.—Another view of carburized edge of Fig. 13, showingWidmannstattian structure. Etched 10 sec. with 4 per acid. x 50. per cent. C. The carbon in this case is evidently not pyridene,but residual carbon monoxide, dioxide, acetylene, or methane, whichescaped the purification process. Figs. 14 to 17 show these structuresin more detail. The fine fines, needles, slip bands or Neuman bands,are plainly evident. They are not made any more numerous by strain-ing the piece, as would be expected if they were slip bands caused by theextreme brittleness of the nitroge
. Transactions. Fig. 14.—Another view of carburized edge of Fig. 13, showingWidmannstattian structure. Etched 10 sec. with 4 per acid. x 50. per cent. C. The carbon in this case is evidently not pyridene,but residual carbon monoxide, dioxide, acetylene, or methane, whichescaped the purification process. Figs. 14 to 17 show these structuresin more detail. The fine fines, needles, slip bands or Neuman bands,are plainly evident. They are not made any more numerous by strain-ing the piece, as would be expected if they were slip bands caused by theextreme brittleness of the nitrogenized ferrite. Strain followed by an-nealing does not increase the number of these lines, as would be ex-pected were they due to twinning. They seem to be associated withsome critical carbon content. To call them iron nitride is a long unwar-ranted step in the dark. 268 NITROGEN IN STEEL AND THE EROSION OF GUNS.
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