1%Mn-0.034%Ti添加極低炭素鋼板の変態集合組織に及ぼす微量炭素添加量の影響

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The development of the steel sheet, which has good combination of excellent press-formability and high strength, is achieved by the transformation structure strengthening of extra-low carbon steel sheets. The samples used are 1%Mn-0.035%Ti extra-low carbon steel cold-rolled sheets, which contain no Nb. The sheets are recrystallized and then carburized up to 189 ppm, in order to examine the effects of carbon content and heating temperature on the transformation behavior and transformation texture. (1) The transformation structure formed by quenching from γ region into iced water gives 150 HV for 16 ppm carbon and 180 HV for 49 ppmC. Moreover, the transformation structure was the quasi-polygonal ferrite and/or intermediate ferritic phase having high dislocation density, and the (111) orientation (texture) developed, which suggest the possibility of an excellent combination of high strength and good deep-drawability. (2) The formation of the lath martensite in the steel containing 189 ppm carbon promoted the development of (100) and/or (110) orientation and the decrease of (111) orientation. (3) The subboundary of intermediate transformation phase is composed of mainly incoherent interface. The relationship between the development of (111) transformation texture and the nature of interface is very stimulating and must be examined to clarify the mechanism of development of (111) texture with respect to transformation mechanism reconstructive or displacive.
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1%Mn-0.034%Ti添加極低炭素鋼板の変態集合組織に及ぼす微量炭素添加量の影響

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