17.5Ni 型高強度マルエージ鋼の組織微細化と引張性質

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Solution-treatment temperature and the refinement of austenite grains by solution-treatment after cold working have been investigated for 17.5Ni-12.5Co-Mo maraging steels with and without titanium. Titanium contents were 1.7 and 2%, and molybdenum content varied from 3.9 to 6.5%. Optimum solution-treatment temperature rises with the increase in molybdenum or titanium content. When the solution-treatment after cold working is applied to the maraging steels which were previously solution-treated at relatively low temperatures, austenite grains are possible to be refined considerably. Tensile properties after maraging in the temperature range 500°to 560℃ have also been investigated for 17.5Ni-12.5Co-5.4Mo-2Ti and 17.5Ni-12.5Co-6.2Mo-1.7Ti maraging steels, the austenite grains of which were refined by solution-treatment after cold working. Maximum tensile strengths obtained are about 280kgf/mm^2 for the 17.5Ni-12.5Co-5.4Mo-2Ti steel and about 270kgf/mm^2 for the 17.5Ni-12.5Co-6.2Mo-1.7Ti steel. Because of fine austenite grains, the materials are ductile even in high strength level.
社団法人日本鉄鋼協会の論文
1983-05-01