. Transactions. Fig. 17.—Axxeal VIII. 121 hr. at770=^ C. X 100. Fig. 18.—Same as Fig. 17, etched withsodium picrate. x FiQ. 19.—Anneal C. X 100. HR. AT Fig. 20.—Same as Fig. 19, etched withsodium pic rate. x 100. SPBCIMSNa NOT 0THBRWI8E NOTED WERE ETCHED WITH 5 PER CENT. NITRIC ACID IN ALCOHOL. ARTHUR PHILLIPS AXD E. S. DAVEXPORT 479 tite more clearly. The ferrite is not much finer in grain than that shownin Fig. 13 but the temper-carbon particles are somewhat larger, moreregular in outline, and more compact. The cementite, in Figs. 13, 15,and 16, is of the massive variety, and is
. Transactions. Fig. 17.—Axxeal VIII. 121 hr. at770=^ C. X 100. Fig. 18.—Same as Fig. 17, etched withsodium picrate. x FiQ. 19.—Anneal C. X 100. HR. AT Fig. 20.—Same as Fig. 19, etched withsodium pic rate. x 100. SPBCIMSNa NOT 0THBRWI8E NOTED WERE ETCHED WITH 5 PER CENT. NITRIC ACID IN ALCOHOL. ARTHUR PHILLIPS AXD E. S. DAVEXPORT 479 tite more clearly. The ferrite is not much finer in grain than that shownin Fig. 13 but the temper-carbon particles are somewhat larger, moreregular in outline, and more compact. The cementite, in Figs. 13, 15,and 16, is of the massive variety, and is caused by insuflScient temperatureduring anneal, rather than of the pearlitic or sorbitic variety, which iscaused by too rapid cooling, as in Fig. 10. An examination of structuresand tensile data of anneals III, V, and VII leads to the conclusion thatpearlitic or sorbitic cementite from rapid cooling, even though thereis more of it, is much less harmful from the standpoint of ductihty thanthe massive cementite resulting from under-anneahng. Anneal VIII, (770° C).—This heat treatment was the second attemptto get
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