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        Fe-Si-Mn-P강판의 초기조직변화가 잔류오스테나이트 형성 및 인장성질에 미치는 영향

        문원진,강창용,김한군,김기돈,성장현 ( Won Jin Moon,Chang Yong Kang,Han Goon Kim,Ki Don Kim,Jang Hyun Sung ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.1

        This study has been conducted to investigate the effects of initial structure on the microstructure and tensile properties of high strength trip steel sheet. The initial structure before austempering remarkably influenced the second phase. The specimen with normalized initial structure showed mainly bainitic ferrite and retained austenite, while the as rolled specimen and spherodized specimen showed martensite plus retained austenite and martensite plus bainitic ferrite with small retained austenite, respectively. Two type of retained austenite, film type and granual type were observed in all specimens. The as rolled specimen appeared the highest contents of retained austenite owing to the compressive stress by cold rolling. The contents of retained austenite increased with increasing intercritical annealing temperature and austempering time. Tensile strength showed the highest in the as rolled specimen, while the highest elongation were obtained in the normalized specimen. The maximum T.S.×El. Value showed in normalized initial structure and increased with increasing intercritical annealing and austempering time. The highest Value of T.S.×El. obtained at austempering temperature of 400℃ and retained austenite of 12%.

      • KCI등재

        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.

      • KCI등재

        Fe-Mn-Si-P 강에서 잔류오스테나이트 형성 및 인장성질

        강창용,성장현,문원진 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.3

        Formation of retained austenite and tensile properties of austempered Fe-Mn-Si-P steel after intercritically annealing the initially normalized specimen have been investigated. Two type of retained austenite, film and granular, were observed. The retained austenite of film type existing between the bainitic ferrite lath increased with increase of intercritical annealing temperature. The isolated granular type increased with increase of austempering temperature. With decrease of intercritical annealing temperature and increase of time, retained austenite and carbon contents increased, contents of retained austenite and carbon were shown with increasing austempering time. Due to the removal of martensite and increment of retained austenite contents, tensile strength decreased and elongation increased with increasing austempering time up to 5 min. The TS×El value increased with increase of austempering time and retained austenite concents. The maximum TS×El value of TS×El 3000 above obtained at the retained austenite of 12% and the austempering temperature of 400℃

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