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Three radially-cracked disks that circulated the protective gases in a bell-type annealing furnace were examined. During service they had been heated in cycles of 48 h to 720 deg C for 3 h each time, then were kept at temperature for 15 h followed by cooling to 40 deg C in 30 h, while rotating at 1750 rpm. Two disks were cracked at the inner face of the sheet metal rim while the rim of the third was completely cracked through. An analysis of the sheet metal rim of one of the disks showed the following composition: 0.06C, 1.98Si,...

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