INFLUENCE OF THE PREHEATING OF INGOT ON THE PROPERTIES OF 3S SHEET (PART 2):EFFECT ON RFCRYSTALLIZATION TEMPERATURE AND GRAIN SIZE
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It was previously reported that the sheet rolled from preheated ingots can be completely annealed at 350°C even in an electric air furnace without any grain growth. On the other hand, one rolled from an un-preheated ingot could not be anealed at less than 450°C in an air furnace and its grain size became too large to use for deep drawing.In the present investigation, the authors looked into the effect of preheating of ingots on the recrystallization temperature and the grain size by means of microscopic and X-ray analysis.Then it was ascertained that the recrystallization temperature of 3S sheet is affected by the preheating of ingot, i. e. it was 270°C or 340°C in the case of preheating or not, respectively. These remarkable differences of recrystallization temperature may be due to the initial grain size of annealed sheet (2.5mm).Furthermore, the effect of preheating on the grain size of sheet and the relations between grain size, heating temperature and heating time were systematically investigated in this research.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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