. Transactions. Those represented in Figs. 2, 3, and 8, and in Table II. con-sisted in cooling like f-in. round bars of steel No. IV. of cent, of carbon and of manganese from 900° undervarying conditions, and determining their tensile properties,hardness, and microstructure. Certain bars were air-cooleddirectly from 900°; the rest were furnace-cooled to the upperpart of the divorcing range, 685°. From this point on somewere air- and some furnace-cooled immediately on reaching685° (ordinates B and Cof Figs. 2 an
. Transactions. Those represented in Figs. 2, 3, and 8, and in Table II. con-sisted in cooling like f-in. round bars of steel No. IV. of cent, of carbon and of manganese from 900° undervarying conditions, and determining their tensile properties,hardness, and microstructure. Certain bars were air-cooleddirectly from 900°; the rest were furnace-cooled to the upperpart of the divorcing range, 685°. From this point on somewere air- and some furnace-cooled immediately on reaching685° (ordinates B and Cof Figs. 2 and 3); some were held forvariable periods at 685° and then air-cooled (ordinates D andE); and some were thus held at 685° and then furnace-cooledto 330° (ordinate i^, whence they were air-cooled. All theheatings were in an atmosphere rich in carbonic oxide, to re-strain decarburization. After these heat treatments the out-side of the specimens was turned ofE to remove any decarbur- 522 DIVORCING 60,000 20 50,000 10 40,000 INCREASING SLOWNESS to Fig. 1.—The vertical scale from 40,000 to 60,000 lb. is tlieFig. 1.—Influence of the Eate of Cooling from !)(iO° C. on the Per Cknt. The several curves represent the maximuiu, miniimiai, and average DIVORCING ANNEALING. 523
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
