摘要
通过热模拟和实验室热轧试验,研究了＂高温大变形＋超快速冷却＂工艺和传统TMCP工艺下试验钢显微组织的区别和强韧性规律。结果表明,超高冷却速率使过冷度变大,形核率升高,新相形核主要以晶内形核为主。＂高温大变形＋超快速冷却＂工艺得到的细化针状铁素体、高密度位错以及弥散细小的析出物保证了材料的综合性能,使热轧钢板综合性能达到了X90标准,并且轧制力比传统TMCP工艺低1 000~7 000 kN。高温大变形后的弛豫过程使组织严重粗化,强韧性明显降低。
The microstructural differences and mechanical properties of the tested steel rolled by ultra fast cooling process and traditional TMCP process were investigated by means of thermal simulation and laboratory hot rolling tests. It is demonstrated that condensate depression and nucleation rate increase with increasing cooling velocity and intracrystalline nucleation is main nucleation form of the new phase. Mechanical properties of the rolled plates in laboratory can exceed X90 grade because of the refining acicular ferrite, the dislocation with high density and the refining precipitation. Otherwise, the value of rolling force of high temperature process is lower than that of traditional TMCP process. Relaxation process makes mechanical properties of the tested plates worse because of grain growth coursing.
出处
《钢铁》
CAS
CSCD
北大核心
2010年第6期49-53,58,共6页
Iron and Steel
基金
国家自然科学基金资助项目(50504007)
关键词
新一代超快冷技术
形核
析出强化
轧制力
管线钢
new generation thermomechanic control process （TMCP）
nucleation
precipitation strengthening
rolling force
pipeline steel
