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냉각제어된 Fe-Si-Mn-P 고장력 강판의 미세조직 및 기계적성질
문원진,김익수,강창용,성장현,김기도 ( Won Jin Moon,Ik Su Kim,Chang yong Kang,Jang Hyun Sung ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.2
Microstructure and mechanical properties of Fe-Si-Mn-P high strength steel sheet have been investigated by controlling the cooling rate. Bainite and ferrite were obtatined by annealing in the ferrite pluse austenite region, and ferrite and austenite were obtatined after annealing in the fully austenite region. Ferrite and pearlite were obtained when the cooling rate was controlled from the annealing temperature above 760℃ and bainite showed with increasing cooling rate, however below 760℃ ferrite and bainite were obtained. Tensile strengths and hardness nearly unchanged with increasing cooling rate after control the cooling rate from the temperature above 760℃, while tensile strengths increased and elongation decreased with increasing cooling rate when the cooling rate was controlled from the tempeature below 760℃. Without regard to annealing temperature, tensile strength increased and elongation decreased with increasing cooling rate. Tensile strengths and elongation values heat treated in the ferrite plus austenite region were higher than those in the fully austenite region. Retained austenite and strength-elongation balance showed the maximum value at 780℃ and decreased with increasing annealing temperature. Strength-elongation balance value was controlled by the retained austenite.