. Transactions. Fig. 41.—Same area as Fig. 28 after drawing at 200° C. for 24 hr. Ads- TENITE IS changed TO MARTENSITE. EtCHED 10 SEC. WITH 4 PER CENT. NITRIC ACID. X FiQ. 42.—In same area as Fig. 31 after a 24-hr. draw at 200° C Etched 10 SEC. with 4 PER CENT. NITRIC ACIV. X 500. 286 NITROGEN IN STEEL AND THE EROSION OF GUNS Other Alloy Steels.—The object of treating a large number of alloysteels 20 hr. in NH 3 at 650° C. and, in some cases, at 750° C. was to observethe depth of the case formed and gather an idea of the effect of the addedelement in retarding or accelerating this reacti
. Transactions. Fig. 41.—Same area as Fig. 28 after drawing at 200° C. for 24 hr. Ads- TENITE IS changed TO MARTENSITE. EtCHED 10 SEC. WITH 4 PER CENT. NITRIC ACID. X FiQ. 42.—In same area as Fig. 31 after a 24-hr. draw at 200° C Etched 10 SEC. with 4 PER CENT. NITRIC ACIV. X 500. 286 NITROGEN IN STEEL AND THE EROSION OF GUNS Other Alloy Steels.—The object of treating a large number of alloysteels 20 hr. in NH 3 at 650° C. and, in some cases, at 750° C. was to observethe depth of the case formed and gather an idea of the effect of the addedelement in retarding or accelerating this reaction. The method is farfrom quantitative. For instance, two steels, each of per cent,carbon, per cent, chromium, one of per cent, vanadium, andthe other of per cent, vanadium, would not give in a half-dozen experi-ments consistent results as regards the depth of penetration. Such finedistinctions are beyond the scope of this method. It does, however, givea broad general idea of the effect of different families of elements. The
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
