280kg/mm^2 級マルエージ鋼の加工熱処理による強靱化

概要

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In order to improve the strength and toughness of 280 kg/mm^2 grade maraging steels, the effects of two types of thermomechanical treatments by multiple-pass rolling and single-pass large reduction pressing followed by annealing, on the microstructure, tensile properties and fracture toughness have been investigated. The excellent combination of strength, ductility and toughness can be achieved by the former treatment, particularly in low finishing temperature of the rolling, because uniform and fine grained structure is obtained. However, the latter treatment leads to the poor ductility, because mixed structure with fine and coarse grains is produced. The strength and ductility of maraging steel could be improved by grain refinement and warm working below recrystallization temperature, but the toughness is essentially unaffected by those factors.
1977-09-01