. Transactions. ng temperature. From these data we infer that coarse pro-eutectoid cemen-tite has much less effect on the tenacity and elastic limitthan on the ductility, as would naturally be inferred fromthe considerations given above, that ductility represents ca-pacity to endure plastic deformation, a capacity which wouldnaturally be decreased by the coarseness of the pro-eutectoidcementite, whereas tenacity and yield point represent ratherthe behavior under elastic deformation, in which the effectsof the coarseness of the pro-eutectoid cementite would natu-rally be much less marked. And h
. Transactions. ng temperature. From these data we infer that coarse pro-eutectoid cemen-tite has much less effect on the tenacity and elastic limitthan on the ductility, as would naturally be inferred fromthe considerations given above, that ductility represents ca-pacity to endure plastic deformation, a capacity which wouldnaturally be decreased by the coarseness of the pro-eutectoidcementite, whereas tenacity and yield point represent ratherthe behavior under elastic deformation, in which the effectsof the coarseness of the pro-eutectoid cementite would natu-rally be much less marked. And here we have an explanation of the contrast betweenhypo- and hyper-eutectoid steel as regards grain refining byreheating coarsened metal. Coarsened hypo-eutectoid steel isbenefited by heating to above the transformation range, and 540 DIVORCING ANNEALING. 10 r^ z o J 0100,000 90,000 80,000 <^ X 70,000 III o . 1 z in z ry tu (/) m 60,000 50,000 40,000 30,000 Contraction of Area Elongation in 4 in. I cj --ir. 0 700 800 900 TEMPERATURE OF REHEATING, DEGREES CENTIGRADE Fig. 7.—Therapeutic Tnfluexce of Heating to Variovs Ti:.MrKKA- Steels (Carbon and Note to Fig. 7.—The |-in. round bars as received from the maker were various temperatures shown, varying from 710° to 1,300°, and again furnace- sile testing. The point at the left-hand end of the curves represents the DIVORCING ANNEALING. 541 Contraction of Area
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
