卷取后冷却速度对高强度热轧带钢组织的影响

采用拉伸实验、电镜观察、能谱分析和硬度测试等方法,研究了700MPa级高强度钢热轧钢卷组织性能分布不均的特点,对造成其组织性能不均的原因进行了分析. 结果表明,钢卷纵向力学性能分布不均,分布规律为成卷后钢卷的中部>内部>外部,内部和外部相差不大. 沿钢卷纵向,中部试样和外部试样的金相组织、碳氮化物析出状态均存在着明显差异,这是造成钢卷力学性能不均的主要原因. 卷取后的冷却速度对金相组织、碳氮化物析出状态有着重要影响.

Influence of cooling velocity after coiling on the structure of high strength steel

The characteristics of property nonuniformity and the cooling velocity after coiling of 700 MPa hot rolled steel plates were investigated by means of tensile test,SEM,TEM,energy spectrum analysis and hardness test,and the reasons that cause these characteristics were analyzed.The results show that the strength of the coil intermediate is the highest,but that of the outside is the lowest.There is significant difference in metallurgical structure and precipitation behavior of carbonitrides in the coil intermediate and outside samples,which is the main reason that causes property nonuniformity.The cooling velocity after coiling is an important factor that affects the metallurgical structure and precipitation behavior of carbonitrides.