. Microstructure of changes accompanying the annealing of cast bronze (Cu88, Sn 10, Zn 2). . c, B-12, series 1, heated two hours at 8oo° C,obliquely illuminated; 3X d, B-40, series 2a, heated two hours at 8oo° C; 100X Fig. 5 Microstructural Cast Bronze 17 VII. SUMMARY 1. The metal, upon annealing, is first brought into physico-chemical equilibrium. The dendritic structure persists untilheated for approximately two hours at 8oo°. The absorption ofthe eutectoid depends much on how the cast sample cooled whilesolidifying; four hours heating at 8oo° is required for its disappear-ance in those samp
. Microstructure of changes accompanying the annealing of cast bronze (Cu88, Sn 10, Zn 2). . c, B-12, series 1, heated two hours at 8oo° C,obliquely illuminated; 3X d, B-40, series 2a, heated two hours at 8oo° C; 100X Fig. 5 Microstructural Cast Bronze 17 VII. SUMMARY 1. The metal, upon annealing, is first brought into physico-chemical equilibrium. The dendritic structure persists untilheated for approximately two hours at 8oo°. The absorption ofthe eutectoid depends much on how the cast sample cooled whilesolidifying; four hours heating at 8oo° is required for its disappear-ance in those samples which solidified very slowly. 2. No evidence was found suggesting a change of crystal sizeof cast samples which had not been distorted in any way. 3. Recrystallization, including twinning, was found only tofollow distortion or its equivalent; metal cooled suddenly fromthe molten state behaves similarly because of the high internalstresses resulting. Chilled castings may be expected to act ina like manner upon annealing. 4. The progress of recrystallization upon annealing for diff
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