予備時効後の冷間圧延と再時効による 18%Ni マルエージ鋼の強化

概要

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Thermomechanical treatments for improving tensile strength of 18%Ni maraging steels have been investigated. The thermomechanical treatments applied to the 210kg/mm^2 and 245kg/mm^2 grades maraging steels include a) cold rolling and aging, b) cold rolling in preaged conditions with and without subsequent re-aging at about 500℃. Increases in strength produced by cold rolling and aging are given as a function of the reduction in thickness. The tensile strength in the transvers direction reaches to a peak and then decreases because of the drop in elongation. The increase in strength produced by cold rolling in the pre-aged conditions is small. However, the tensile strength is greatly increased by the subsequent re-aging. The tensile strength in the transverse direction is remarkably improved by a thermomechanical treatment including preaging at 500℃, cold rolling, and re-aging at about 500℃.
社団法人日本鉄鋼協会の論文
1976-08-01