18%Ni マルエージ鋼の引張性質におよぼすオーステナイト粒度および時効前における冷間圧延の影響

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The influence of austenite grain size on the tensile properties of 18 Ni maraging steels has been investigated. The austenite grain size of these steels can be remarkably refined by annealing of the cold worked specimens at relatively low solution temperatures. Improvement in strength, ductility and toughness through austenite grain refinement is observed in aged conditions. The ductility of the 175 and 210 kg/mm^2 grade maraging steels is relatively high even in coarse grained matrix. The austenite grain size of the 245 kg/mm^2 grade maraging steel should be refined in order to improve the mechanical properties such as tensile strength, reduction in area, notch sensitivity and impact value because of its distinct low ductulity in coarse grained matrix. An appreciable increase in strength is found when solution treated specimens is cold worked and then aged. This strength increase is caused by work hardening of the martensite. Refining the austenite grain size of solution treated specimens increases work hardening. The 210 kg/mm^2 grade maraging steel can be strengthened to the strength level of 245 kg/mm^2 by a combination of work hardening and precipitation hardening, moreover its notch sensitivity is lower than that of the 245 kg/mm^2 grade maraging steel. In the 245 kg/mm^2 grade maraging steel, fine grained specimens show higher strength and tend to improve the notch sensitivity compared to those obtained in coarse grained ones when cold worked and then aged.
社団法人日本鉄鋼協会の論文
1976-02-01

18%Ni マルエージ鋼の引張性質におよぼすオーステナイト粒度および時効前における冷間圧延の影響

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