. Microstructure of changes accompanying the annealing of cast bronze (Cu88, Sn 10, Zn 2). . mm for the three specimens. <* Because of variation in the heating current, the temperature rose to 840° during this interval TABLE 4Series 3 The samples were quenched, while in the molten state from 1200° C, in cold water. No mechanical workof any kind was done upon them.] Specimen Thermal treatment Amount of eutectoid a Grain size & persquare centimeter Twinned crystals c B27 B28B26 2 hours at 800° 4 hours at 800° C 8 hours at 800° C 1835 2500 198 o See note d, serie
. Microstructure of changes accompanying the annealing of cast bronze (Cu88, Sn 10, Zn 2). . mm for the three specimens. <* Because of variation in the heating current, the temperature rose to 840° during this interval TABLE 4Series 3 The samples were quenched, while in the molten state from 1200° C, in cold water. No mechanical workof any kind was done upon them.] Specimen Thermal treatment Amount of eutectoid a Grain size & persquare centimeter Twinned crystals c B27 B28B26 2 hours at 800° 4 hours at 800° C 8 hours at 800° C 1835 2500 198 o See note d, series i. & The difference in grain count for Nos. 27 and 28 is most probably to be accounted for by a differencein severity of quenching. As the crucible and contents were thrown into water in each case, the rate ofcooling of the metal was undoubtedly affected somewhat by the crucible. c The average number of twinned crystals were obtained in a manner similar to that used for expressingthe amount of eutectoid. (See note d, series 1.) Bureau of Standards Technologic Paper No. 60. a, B-29, series 2a, heated one hour at 8oo° C;5X. The recrystallized layer shows just be-neath the protective copper coating on thesurface and lining the central hole b, B 3s-3, series 2b, heated eight hours at 400° C;100 X
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