Transactions . Fig. 13. I - Fig. 14. X60. 490 SHOCK TESTS OF CAST STEEL. This casting had no section over 1 in. thick, and averaged \ all over. The results of the drop test thus confirm the Fremonttests, which show that the steel annealed by heating and slow cooling,which gives the coarse microstructures shown in Figs. 4 and 5, isquite brittle under sudden shock. The following tests, from coupons 2 by 3 by 8 in. cut from a singlecasting, and heat treated in several different ways, show strikingly theeffect of sudden cooling upon the shock toughness of even very mildsteel. The an
Transactions . Fig. 13. I - Fig. 14. X60. 490 SHOCK TESTS OF CAST STEEL. This casting had no section over 1 in. thick, and averaged \ all over. The results of the drop test thus confirm the Fremonttests, which show that the steel annealed by heating and slow cooling,which gives the coarse microstructures shown in Figs. 4 and 5, isquite brittle under sudden shock. The following tests, from coupons 2 by 3 by 8 in. cut from a singlecasting, and heat treated in several different ways, show strikingly theeffect of sudden cooling upon the shock toughness of even very mildsteel. The analysis of this steel was : C, ; Si, ; Mn, cent. Unfortunately, two of the coupons were not sound enough to givetensile test bars of any value, and one bending bar contained a blow-hole. The microstructures of these coupons are shown in Figs. 9 to14, and the heat treatments and physical properties in the accom-panying table: Treatment. per sq. in. 9 None, 50,020 10 900° 3 hr.; cooled
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
