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采用未浸表面改性剂直接热浸铝、浸表面改性+热浸铝两种不同的表面处理工艺分别对钢基体外表面进行处理,利用镶铸法制备钢-铝双金属复合材料,研究了复合铸件铸态和T6态的界面组织和结合性能。结果表明,直接浸铝铸件在Fe-Al交界处存在缝隙,未形成冶金结合层,其界面结合情况较未处理铸件有所改善,界面结合力提高了21.23%,达到60.30kN,缝隙率降至10.99%;改性+浸铝铸件存在Fe-Al、Al-Al两种界面,在Fe-Al界面处出现“锯齿状”冶金过渡层,界面剪切强度较直接浸铝铸件提高13.85%以上,缝隙率降至2.93%。改性+浸铝铸件T6热处理后,过渡层厚度明显增加,“锯齿”平均长度由31μm增至46μm,且过渡层成分逐渐均匀化,界面结合力增至79.71kN。
The surface of the steel substrate was treated with two different surface treatment methods, ie hot-dip aluminum without immersion surface modifier, immersion surface modification and hot-dip aluminizing. The steel-aluminum bimetal composite was prepared by insert casting The interfacial microstructure and bonding properties of as-cast and T6 composites were investigated. The results show that there is a gap between the Fe-Al interface and the metallurgical bonding layer. The interfacial bonding is improved compared with the untreated castings, the interfacial bonding strength increases by 21.23% to 60.30kN, the porosity decreases to 10.99%. There were Fe-Al and Al-Al interfaces in the modified + cast aluminum castings, and the “serrated” metallurgy transition layer appeared at the Fe-Al interface. The interfacial shear strength increased by 13.85% Above, the porosity decreased to 2.93%. After T6 heat treatment, the thickness of transitional layer increased obviously, the average length of sawtooth increased from 31μm to 46μm, and the composition of transitional layer gradually became homogeneous, the interfacial bonding strength increased to 79.71kN.