. Transactions. Fig. 47. -Rough groove in steel treated in NH3 at 650° C. and polished, SHOWING FUSED APPEARANCE. X 50. metal might reach quite a high temperature; that it does not is evidencedin several ways. It looks fused but this appearance can be producedat 650°C. with nitrogen and rough polishing; Fig. 47shows an artificialeroded groove. Also, it has never been pointed out that the ferrite network extendswell into this hard layer. Fig. 48 shows a case of this on a plane per-pendicular to the axis and Figs. 49 and 50 show this network on a planeperpendicular to a radius. The sharp outline
. Transactions. Fig. 47. -Rough groove in steel treated in NH3 at 650° C. and polished, SHOWING FUSED APPEARANCE. X 50. metal might reach quite a high temperature; that it does not is evidencedin several ways. It looks fused but this appearance can be producedat 650°C. with nitrogen and rough polishing; Fig. 47shows an artificialeroded groove. Also, it has never been pointed out that the ferrite network extendswell into this hard layer. Fig. 48 shows a case of this on a plane per-pendicular to the axis and Figs. 49 and 50 show this network on a planeperpendicular to a radius. The sharp outline of the original ferritepattern is also shown. Could this metal have been above the criticalpoint even for an instant, granting that pearlite would merge morereadily than massive ferrite? H. E. WHEELER 297. Fig. 48.—Eroded gun tube; section perpendicular to axis. Showing fer- RITE network extending INTO WHITE LAYER. X 500. EtCHED 20 SEC. WITHPICRIC ACID.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
