. Transactions. HH Hi^^v^Bk* Wm^- sfl^ ■ ^ ▼ .>^ ^ ^^^r; . ■^■^B SSm ^^^Hr ^ J-Vi^* St n f^ At^^HJI iiti^A^^u^ ^ ^■ -.• ^S^^H HhH I iw ■♦v- - v^^^^^^^^^^l H 1 Fig. 52.—Junction of two zones, same view as in Fig. 51. 10 SEC. WITH 4 per cent. NITRIC ACID. X 25. Etched Howe pointed out that when the layer was heated to 1000° C. it dis-appeared, showing that it was due to unstable equilibrium due to writer has felt that there was also the possibility that at 1000° high concentration of nitrogen in this layer was lowered by diffusioninto the piece. If a gun-tube section is
. Transactions. HH Hi^^v^Bk* Wm^- sfl^ ■ ^ ▼ .>^ ^ ^^^r; . ■^■^B SSm ^^^Hr ^ J-Vi^* St n f^ At^^HJI iiti^A^^u^ ^ ^■ -.• ^S^^H HhH I iw ■♦v- - v^^^^^^^^^^l H 1 Fig. 52.—Junction of two zones, same view as in Fig. 51. 10 SEC. WITH 4 per cent. NITRIC ACID. X 25. Etched Howe pointed out that when the layer was heated to 1000° C. it dis-appeared, showing that it was due to unstable equilibrium due to writer has felt that there was also the possibility that at 1000° high concentration of nitrogen in this layer was lowered by diffusioninto the piece. If a gun-tube section is etched with copper chloride, as in Fig. 54,the ferrite is clean. If heated to 1000° C, furnace cooled, and etchedagain with copper chloride, the ferrite is darkened, as in Fig. 55, givingthe reverse pattern. This would seem to indicate that the nitrogen dif-fuses evenly through the austenite and, when it comes down, is foundmostly in the ferrite. 302 NITROGEN IN STEEL AND THE EROSION OF GUNS. Fig. 53.—Within white layer. Same section as in Fig. 51 after draw in HAT 300° C. FOR 5 HR. X 500. Etched 10 sec. with 4 per cent, nitric acid.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
