. Transactions. Fig. 58.—Cross-section of threaded portion op split pulled tensile bar TREATED IN XH3 AT 650° C. FOR 6 HR. OnLY SIDE OF THREAD WHICH TOOK PULL ISAFFECTED. X 50. EtCHED 10 SEC. WITH 4 PER CENT. NITRIC Fig. 59.—Outside edge of bar portion as tensile bar shown in Fig. 58 at POINT NEAR FRACTURE. ThE INSIDE SHOWED NO WHITE LAYER ALTHOUGH EQUALLY EXPOSED, X 50. Etched 10 sec with 4 per cent, nitric acid. VOL. LXVII.—20 306 NITROGEX IX STEEL AND THE EROSION^ OF GUNS solid-solution phase (chromium, etc.) and at the same time must be aslittle penetrable to gases under pressure as
. Transactions. Fig. 58.—Cross-section of threaded portion op split pulled tensile bar TREATED IN XH3 AT 650° C. FOR 6 HR. OnLY SIDE OF THREAD WHICH TOOK PULL ISAFFECTED. X 50. EtCHED 10 SEC. WITH 4 PER CENT. NITRIC Fig. 59.—Outside edge of bar portion as tensile bar shown in Fig. 58 at POINT NEAR FRACTURE. ThE INSIDE SHOWED NO WHITE LAYER ALTHOUGH EQUALLY EXPOSED, X 50. Etched 10 sec with 4 per cent, nitric acid. VOL. LXVII.—20 306 NITROGEX IX STEEL AND THE EROSION^ OF GUNS solid-solution phase (chromium, etc.) and at the same time must be aslittle penetrable to gases under pressure as possible. A means of measur-ing this penetrabihty would be extremelj^ desirable. Some apology seems necessary for the large number of expressionsof opinion herein which are not sufficiently supported by experimentalevidence. In a few cases this might be done for those who are for the most part probability was sought for to the sacrifice of elabor-ate proof and the results are offered not as a completed research but inthe hope that they may be of some interest to those now working onsimilar problems. Acknowledgments All vacuum work and gas analyses were performed by Lieut, E. ^ All ana
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
