(东北大学 材料电磁过程研究教育部重点实验室, 沈阳 110004)
摘 要: 研究H90-钢-H90反向凝固复合过程中复合层厚度的变化规律以及复合带的组织和性能，探讨界面结合机理。结果表明：随着浸渍时间的增加，复合层的厚度变化经历了凝固生长、平衡相持和回熔3个阶段，钢带的预热温度越低，获得的最大复合层厚度越厚；H90复合层的组织为等轴晶粒，复合界面处Cu和Fe发生了扩散，而Zn未发生明显扩散，扩散层较薄，约为4 μm；复合带的界面结合牢固；不同复合层厚度的复合带，其力学性能略有差异，但均达到GB5213—85所规定的F级深冲钢板的力学性能要求。
关键字: 反向凝固；复合带；复合层；界面；结合强度
by inversion solidification
（The Key Laboratory of Electromagnetic Processing of Materials,
Ministry of Education, Northeastern University,
Shenyang 110004, China）
Abstract:The variation law of cladding thickness, the structures and properties of the clad strip produced by inversion solidification were studied. The interface bonding mechanism was approached. The results show that the thickness of H90 cladding goes sequentially through solidification growth stage, holding stage and remelting stage with the increase of immersion time. The higher the preheating temperature of steel coil, the thicker the maximum cladding thickness obtained. The microstructure of H90 clad layer is equiaxed grains. There is inter-diffusion of Cu and Fe near the interface but there is not obvious diffusion of Zn. The diffusion layer is very thin and about 4 μm. The interface is firmly bonded, and the mechanical properties of the as-clad coils can reach the requirements of GB5213-85 for F-grade deep-drawing steel plate though there is slight difference of mechanical properties among the clad strips with different cladding thickness.
Key words: inversion solidification; clad coil; clad layer; interface; bond strength
