10Ni 超強力鋼の高温溶体化処理と靱性について

概要

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It has been found out in low-carbon 9 to 10 Ni high-toughness ultra-high strength steels that high-temperature solution treatment above 1200℃ improves their toughness (vE shelf) significantly. This corresponds to the solution of coarse M_6C carbides greater than 0.3μ, which are retained in the steels at the state as rolled or as ordinarily heat-treated. These carbides again precipitate between 900 to 1100℃ during cooling after high-temperature solution treatment at the cooling rate slower than 0.5℃/s. The steels high-temperature solution-treated exhibit excellent vEshelf without deterioration of proof strength and ductile-to-brittle transition temperature, compared to conventional heat treatment, when they were again austenitized at lower temperature before aging.
社団法人日本鉄鋼協会の論文
1978-04-01