Cu と NiAl の複合析出硬化鋼の組織と靱性に関する研究

概要

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Age-hardening behavior, especially related to the influence of matrix microstructures, and the resulting changes of toughness, was investigated in low-carbon Ni-containing steels with the addition of Cu and Al. Main results are as follows : a. Age-hardening was most prominent when the matrix microstructure was bainitic. b. Precipitates that contribute to age-hardening was concluded to be NiAl and Cu. Grobular NiAl under 100 Å in diameter precipitated at dense dislocations in bainite at peak hardness. c. In 0.15C-1.5Ni-0.5Mo steels, the amount of age-hardening increased, but the toughness was greatly impaired, with increase of the amount of Cu or Al. d. Age-hardening and corresponding change in toughness with the addition of Cu and Al were studied in various low-carbon bainitic steels containing Ni. Among these, low carbon 6Ni-4Cr-1.5Mo-Cu-Al steels maintained fairly good toughness up to the strength level of 200 kg/mm^2, as compared with maraging type of steels.
社団法人日本鉄鋼協会の論文
1977-10-01