摘要
为研究双辊铸轧薄带中各种组织的形成,在实验室的双辊铸机上进行704和1Cr18Ni9Ti奥氏体不锈钢薄带的铸轧实验.对铸轧薄带中所出现的各种细小晶粒组织进行分析,利用金属学及结晶热力学的理论结合有限元模拟计算所得结果对各种组织的形成条件和机制进行探讨.结果表明:双辊铸轧不锈钢可以得到2μm以下的表层激冷组织和2μm的细小枝晶组织,提高了材料表层的抗腐蚀能力;在铸轧薄带中不仅存在中心层的细小等轴晶粒,而且在枝晶区还存在由破碎的枝晶演变而来的较大等轴晶粒,对这些较大等轴晶粒的生成机制出了解释.
In order to elucidate the formation of various microstructures in the twin roll cast strip, the strip casting experiments of 704 and 1Cr18Ni9Ti austenitic stainless steel were done by using a laboratory scale twin roll caster. The formation mechanisms of these microstructures are discussed using metallography and crystallization thermodynamics, and the forming condition of these microstructures was also simulated using FEM numeric simulation. The results show that the surface chilling structure grain size under 1μm, and fine dendrites whose size under 2μm can be obatined by using the twin roll casting technology. These fine grains improved the capability of corrosion resistantce in size of strip surface. In the casting strip, not only the fine equiaxed crystal in the middle of the strip was found, but also the rough equiaxed crystals was found in the dendrite zone, and the formation mechanics of these rough equiaxed crystals was explained.
出处
《材料科学与工艺》
EI
CAS
CSCD
2003年第4期360-363,共4页
Materials Science and Technology
基金
国家自然科学基金资助项目(59995440)
辽宁省自然科学基金资助项目(2001101021).
