中文摘要：

基于UFC-ACC设计理念,结合超快速冷却机理及其在中厚板产品处理过程中的技术实现,针对中低碳钢采用不同轧制方式,分析超快冷后钢板力学性能变化,得出较优超快冷冷却规程;同时,对比不同工艺条件下的金相组织,结合理论计算,总结出超快速冷却条件下中低碳钢组织性能演变规律.从分析结果看,中低碳钢冲击韧性明显提高,其他力学性能也有较大改善;此外,UFC-ACC冷后机体大部分为细小均匀的F＋P组织,并能保持原奥氏体中的高密度位错,使钢板性能优于普通ACC处理后钢板.

英文摘要：

Based on the UFC-ACC design idea and combining the UFC mechanism with its cooling technological applications in medium/heavy plate production,an optimal UFC schedule was given including different rolling processes with the plates＇ mechanical properties changed after UFC analyzed.Comparing the metallographic structures obtained from different technological processes and combining them with theoretical calculation,how the structure property of medium/low carbon steel evolves due to UFC was discussed and summarized.It was found that the impact toughness of medium/low carbon steel increases obviously in addition to other mechanical properties which are also improved.What is more,most of the steel structure is homogeneous and fine F＋P grains after UFC-ACC cooling with the high dislocation density in original austenite kept on,thus making the steel performance treated by UFC-ACC better than that just treated by conventional ACC cooling.