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用垂直连续铸造方法拉制的近终形镍铜铸铁空心型材,较之传统铸造的环坯,其共晶团体积缩小了8~10倍,故在随后与铝合金熔液的浸渗熔接时,作为原子扩散通道的晶界面积成倍增加,使得浸渗速度显著加快,获得了较厚的铝铁化合物层;连铸型材断面上的石墨裸露面积仅有6.5%,大大减少了无效熔接面积。这些因素都使铝铁界面上的熔接强度成倍提高。此外,将空心型材的外圆拉制成花键形,可以使材料利用率由传统的不足40%提高到70%以上。
Near-end nickel-copper cast-iron hollow profiles drawn by vertical continuous casting reduce the volume of eutectic groups by 8 to 10 times compared to the conventional cast billet, and therefore, when subsequently infiltrated with an aluminum alloy melt, , As the atomic diffusion channel grain boundary area multiplied, making the impregnation rate was significantly accelerated to obtain a thick layer of aluminum-iron compound; continuous casting profile cross-section of the graphite bare area of only 6.5%, greatly reducing the ineffective welding area . These factors have doubled the weld strength at the aluminum-iron interface. In addition, the outer profile of the hollow profile is spiraled to increase the material utilization from less than 40% to more than 70%.