摘要
对工业轧制Super-SS400带钢的强度、延伸率和A_k值进行了测定,用OM、SEM、TEM等实验方法研究了不同工艺条件对带钢显微组织的影响。试验结果表明,当终轧温度在780℃～810℃范围内,卷取温度为450℃左右,控制精轧各道次的变形量,可使SS400热轧带钢的屈服强度高于400MPa,抗拉强度超过520MPa,延伸率达到30％。显微组织观察结果表明终轧温度较低时,在形变过程中产生了应变诱导铁素体。应变诱导相变、铁素体动态再结晶以及轧后加速冷却可使Super-SS400钢的组织均匀细小。卷取温度降低,贝氏体含量显著增加,并出现了马氏体。冲击试验结果表明,卷取温度降低时带钢的韧性较差。Super-SS400钢的强化机制包括4部分;细晶强化、固溶强化、亚结构强化和相变强化。
The strength, ductility and toughness of a Super-SS400 in an industrial production were measured and the effect of parameters in TMCP on the microstructures of the steel was investigated by OM, SEM and TEM. The experimental results showed that the yield strength of the steel was over 400MPa , the tensile strength of steel was around 520MPa and the elongation was a-bout 30% when the finish rolling temperature was in the range of 780~810℃ and the coiling temperature was about 450℃. Mi-crostructural observation indicated that deformation induced ferrite transformation (DIPT) occurred in the rolling process and fine ferrite grains formed due to DIPT, the recrystallization of ferrite grains and accelerated cooling. The results also showed that the amount of bainite increased and rnartensite appeared , and the toughness of the steel decreased as the coiling temperature decreased. The strengthening mechanisms include the following: solid solution, fine-grain, substructure and multiple phase hardening.
出处
《塑性工程学报》
CAS
CSCD
2003年第5期89-92,共4页
Journal of Plasticity Engineering
基金
国家973项目(G19980615O9)
国家自然科学基金
上海宝钢集团公司联合资助(50271015)
关键词
超级钢
SS400
控轧控冷
组织性能
supersteel
SS400
controlled rolling and controlled cooling
microstructure and mechanical properties
