極低炭素鋼板の再結晶集合組織におよぼす窒素量の影響

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Fully decarburized, fully denitrogenized and grain refined rimmed steel (extra-low-carbon and extralow-nitrogen steel) has been cold rolled to 75% in reduction, and subsequently nitrogen contents of the steel have been changed to various amounts up to 200ppm. Nitriding has been made using a reaction between steel and atmosphere, NH_3+H_2, at 350℃, without forming any recrystallized grain. Finally these steels have been annealed at 650℃ or 800℃ for recrystallization. Recrystallization texture is markedly affected by the nitrogen content in steel at the stage of recrystallization annealing. {100} components of recrystallization texture decrease abruptly with increasing nitrogen content up to about 20ppm, while {111} components decrease and {110} components increase with increasing nitrogen content up to about 100ppm. Pole figures of the annealed steels show strong {111}{112} texture with minor {100}<011> texture for the extra-low-nitrogen steel, and strong {111}<011> texture with minor {110}<011> texture for the steels containing nitrogen of more than 20ppm. Since {111}<112> and {100}<011> orientations are the major components of the cold rolling textures of the steel, it is suggested that in situ recrystallization occurs when nitrogen content is extremely low at recrystallization stage. The γ^^--value of annealed steels increases initially with nitrogen and decreases with increasing nitrogen. The maximum γ^^--value of 2.0 is obtained when the steel contains nitrogen of about 10ppm at recrystallization stage.
1978-12-01

極低炭素鋼板の再結晶集合組織におよぼす窒素量の影響

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