CAJ | 학술논문

通过Formastor-F全自动相变记录仪上测定了铌钛复合强化型590M Pa级大梁钢在不同冷速下的奥氏体转变动力学曲线，并结合金相组织和硬度测试，分析了不同冷却速度对组织转变、晶粒尺寸和硬度的影响规律。在不同的冷却范围内，试验钢分别获得铁素体、珠光体、贝氏体和马氏体。当冷速在0．5℃/s以下时，获得F＋ P ，在1℃/s～10℃/s之间时，获得F＋ P＋B ，在15℃/s～50℃/s之间时，获得F＋B ，在100℃/s时，获得B＋ M。试验结果为轧钢生产提供了工艺指导依据。
통과Formastor-F전자동상변기록의상측정료니태복합강화형590M Pa급대량강재불동랭속하적오씨체전변동역학곡선，병결합금상조직화경도측시，분석료불동냉각속도대조직전변、정립척촌화경도적영향규률。재불동적냉각범위내，시험강분별획득철소체、주광체、패씨체화마씨체。당랭속재0．5℃/s이하시，획득F＋ P ，재1℃/s～10℃/s지간시，획득F＋ P＋B ，재15℃/s～50℃/s지간시，획득F＋B ，재100℃/s시，획득B＋ M。시험결과위알강생산제공료공예지도의거。
The affecting laws of microstructure transformation ,grain size and hardness at various cool-ing rates were analyzed ,based on Austenite CCT curves of 590MPa beam steel strengthened by micro -al-loy Nb and Ti at different cooling rates determined by the Formastor-F automatic phase transition recorder and metallographic analysis and hardness test .Ferrite ,pearlite ,bainite and martensite appeared on the test steel at different range of cooling rates .F+ P was obtained when the cooling rate was lower than 0 . 5℃ /s ,F+P+B was obtained between 1℃ /s and 10℃/s ,F+B was obtained between 15℃/s and 50℃/s , B+M was obtained at 100℃ /s .The results offered technological process reference to rolling production .