研究压下率和铝带初始厚度对冷轧复合嵌入式铝/钢复合带材铝层厚度波动的影响,分析铝层厚度波动的形成机理,提出改善复合带材铝层厚度均匀性的措施.结果表明,随着压下率的增加,铝层厚度波动逐渐增大.当压下率低于40%时,初始铝带厚度对复合带材铝层厚度波动量的影响较小;当压下率高于40%时,随初始铝带厚度的减小,复合带材的厚度波动量增大.表面处理形成的钢带表面硬化层引起钢带表层变形和钢/铝界面结合程度不均匀是导致复合带材铝层厚度波动的主要原因.采用合适的钢带表面处理方式降低钢带表面硬化程度,改善钢带表层变形和钢/铝界面结合程度的均匀性,可有效降低铝/钢复合带材的铝层厚度波动.
The influences of rolling reduction and aluminum sheet initial thickness (AIT) on the thickness fluctuation of aluminum layer (TFA) of embedded aluminum?steel composite sheet produced by cold roll bonding were investigated, the formation mechanism of TFA was analyzed and method to improve the thickness uniformity of the aluminum layer was proposed. The results showed that when the reduction increased, TFA increased gradually. When the reduction was lower than 40%, AIT had negligible effect on the TFA, while TFA increased with the decrease of AIT when the reduction was higher than 40%. The non-uniformities of the steel surface deformation and the interfacial bonding extent caused by the work-hardened steel surface layer, were the main reasons for the formation of TFA. Adopting an appropriate surface treatment can help to decrease the hardening extent of the steel surface for improving the deformation uniformity during cold roll bonding process, which effectively improved the aluminum thickness uniformity of the embedded aluminum/steel composite sheets.
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