双辊铸轧高磷铜钢薄带的偏析行为及对力学性能的影响

Phosphorus Segregation and Effect on Mechanical Properties of Twin Roll Strip Cast High P and Cu Steels

双辊薄带铸轧是一种具有广泛应用前景的生产方式。采用薄带铸轧技术可以实现节约能源消耗、简化生产流程、提高资源利用率、利用铸轧的快速冷却特点开发新的结构材料等目的。本文对采用铸轧技术生产高磷、铜钢薄带的可行性进行了探讨。对铸轧高磷铜钢薄带力学性能的检测结果表明,在磷含量为0.1%(质量分数,后同),铜含量为0.3%时,屈服强度和抗拉强度可分别达到290和400 MPa,延伸率为19%。对铸轧和铸轧后退火+冷轧+退火处理的薄带进行的研究表明,磷含量为0.1%以上时,在薄带中开始出现明显P的偏析,而铜含量达到1.5%时仍未出现明显的偏析现象。由此可见,采用双辊铸轧生产方式不仅可以抑制钢中有害元素如磷和铜的偏析,同时还提高材料的力学性能,起到变废为宝的作用。

Twin roll strip casting has a bright future in iron and steel industries because of its features of energy saving,process simplification,effective improvement of resource′s utilization.The possibility of manufacturing weathering steel strips by twin roll strip casting was explored.It was found that the strip with P-0.1% and Cu-0.5% possesses good mechanical properties of a yielding strength of 290 MPa,a tensile strength of 400 MPa and an elongation of nearly 20%.For the strips containing more than 0.1% P,micro-and marco-segregations of P were clearly observed,while Cu segregations were not seen even though the content of Cu was up to 1.5%.It can be concluded that segregations of tramp elements such as P and Cu can be prevented due to the high cooling rate during twin roll strip casting,which may turn the adverse effects of these elements into positive.