制御圧延後の加速冷却の機械的性質に及ぼす影響

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The effects of accelerated cooling after controlled rolling (CR) on the mechanical properties were investigated for the various microalloyed steels. The controlled rolling conditions were the reheating temperature of 1100℃ or 1200℃, the cumulative rolling reduction of 70% below 900℃, and the finishing rolling temperature of 800℃ with the plate thickness of 20mm. The interrupted accelerated cooling (IAC) was carried out in the temperature range from 780℃ to 600℃, followed by air cooling, and the maximum cooling rate was 12℃/s. The increase of cooling rate in IAC caused the microstructural changes such as the refinement of ferrite grain size, disappearance of pearlite banding, and formation of refined bainite in place of pearlite. The increment of strength due to IAC with cooling rate around 10℃/s that gave rise to the very refined duplex structure of ferrite and bainite was 5 to 10 kg/mm^2, depending on the content of the microalloying elements such as Nb, V, or Ti. The Charpy transition temperature was improved by IAC under the reheating temperature of 1100℃, and the superior low temperature toughness such as the transition temperature below -100℃ was attained with occurrence of very few separation on the fracture surface in Charpy impact test specimens. The optimum cooling conditions and the transformation behaviors in IAC were discussed. The increment of strength due to IAC was analyzed on the basis of the quantitative investigation of the transformed microstructure.
社団法人日本鉄鋼協会の論文
1981-05-01

制御圧延後の加速冷却の機械的性質に及ぼす影響

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