AISI304不锈钢双辊连铸薄带的组织性能  

Mechanical properties and microstructure of AISI304 twin-roll casting thin strip

作　　者：王振敏[1] 方圆[2] 齐俊杰[1] 张跃[1] 吴建春[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室 [2]宝钢技术中心,上海201900

出　　处：《材料热处理学报》2007年第6期71-74,共4页Transactions of Materials and Heat Treatment

基　　金：国家杰出青年基金项目(50325209);国家自然科学基金(50572005)

摘　　要：测量了双辊薄带连铸机生产的AISI304连铸薄带的力学性能，采用光学显微镜、扫描电镜和透射电镜观察了连铸薄带的微观组织结构，分析了微观组织结构对性能的影响。结果表明，连铸薄带内部为铸态组织，二次枝晶间距平均值为6．7μm，细小的铸态组织决定了薄带的最终组织细化和成分均匀；快速冷却有助于形成球形夹杂物，直径500～700nm，较小的球形夹杂物能够钉扎位错；连铸薄带内析出粒子的直径20～100nm，这种微小析出能够产生沉淀强化作用；薄带组织中大量位错、层错和孪晶的存在一定程度提高了连铸薄带力学性能。Mechanical properties of AISI304 cast thin strips produced by twin-roll caster were measured. The microstrocture of the trips were characterized by optical microscope, SEM and TEM, and the relationship between microstrocture and mechanical properties was discussed. The results show that the structure of the strip is as-cast structure with secondary dendritic interval of 6.7μm, leading to the final fine grain structure and homogeneous composition in the strip. The high cooling rate is benefit to forming global inclusions with diameter of 500 - 700nm and precipitates with 20- 100nm which can increase strensth of the strip by pining dislocations, and the high density defects of dislocation, stacking faults and finer twins can also make contribution to the high strength of the cast thin strip.

关 键 词：连铸薄带 组织结构 性能 缺陷 

分 类 号：TG142.1[一般工业技术—材料科学与工程]