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采用金相显微分析、扫描电镜组织观察以及能谱分析等方式,对水平连铸生产的铜包钢和锌包钢两种双金属复合材料的界面组织和结构进行观察,探讨其结合机理。研究了其界面存在的缺陷,以提供工艺优化方案。结果表明,铜包钢中,Cu原子主要通过晶界深入扩散至钢基体,Cu/Fe界面已达到冶金结合;钢芯在熔炉中内部残余应力释放,发生微小形变,导致铜包钢包覆的铜层厚度不均。锌包钢中,Zn原子和Fe原子并未深入扩散至对方基体中;由于锌和钢热胀系数相差较大,Zn/Fe界面产生来了较大内应力,导致界面产生较大裂纹。
The interface structure and microstructure of two bimetallic composites produced by horizontal continuous casting were observed by metallographic analysis, scanning electron microscopy (SEM) and energy spectrum analysis. The bonding mechanism was also discussed. The defects of the interface were studied to provide a process optimization solution. The results show that the Cu atoms diffuse into the steel matrix mainly through the grain boundaries and the interface between Cu / Fe has reached metallurgical bonding. The residual stress of the steel core in the furnace is released and the deformation is small, Uneven copper thickness. Zinc-clad steel, Zn atoms and Fe atoms did not in-depth diffusion into the other matrix; due to the large difference between the thermal expansion coefficient of zinc and steel, Zn / Fe interface to produce a larger internal stress, resulting in larger cracks in the interface.