Transactions . CO b fe 574 GRAIN GROWTH IN SILICON STEEL. In order to determine the influence of time of anneal upon the graingrowth, several sheets were placed in a platinum-wound furnaceand heated in hydrogen to 915° C. for 17 hr., 1,000° C. for 8 hr., and1,230° C. for 15 hr. After each period one sample was removed and ex-amined, while the others remained in the hot furnace. No change what- f*f _i_Ll Fig. 6.—Showing the Growth of Grains along the Direction of Strain. I Size. ever occurred until after the last period. Here the grains were quitelarge, but still of the same order of
Transactions . CO b fe 574 GRAIN GROWTH IN SILICON STEEL. In order to determine the influence of time of anneal upon the graingrowth, several sheets were placed in a platinum-wound furnaceand heated in hydrogen to 915° C. for 17 hr., 1,000° C. for 8 hr., and1,230° C. for 15 hr. After each period one sample was removed and ex-amined, while the others remained in the hot furnace. No change what- f*f _i_Ll Fig. 6.—Showing the Growth of Grains along the Direction of Strain. I Size. ever occurred until after the last period. Here the grains were quitelarge, but still of the same order of magnitude as those heated to an equaltemperature for 2 hr. At the lower limit of grain growth, , 1,050° C, it required about15 min. to obtain any noticeable gain in size, but at 1,300° C. a few grainsof from 3 to 5 mm. diameter formed in 3 sec. Upon further heating thesesometimes grew to from 8 to 10 mm., but, as a rule, continued heatingproduced other grains, so that in 15 min. the whole sheet would
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
