嵌入式鋁/鋼帶材軋制復(fù)合鋁層和鋼層厚度的變化規(guī)律

嵌入式鋁/鋼帶材軋制復(fù)合鋁層和鋼層厚度的變化規(guī)律Thickness variation of aluminum layer-steel layer of embedded aluminum-steel composite strip during cold roll bonding

采用冷軋復(fù)合法制備嵌入式鋁/鋼復(fù)合帶材，研究了嵌入式鋁/鋼帶材冷軋復(fù)合壓下率、鋁帶初始厚度對軋制復(fù)合變形區(qū)內(nèi)鋁層和鋼層厚度比變化的影響規(guī)律；采用切片法計算變形區(qū)內(nèi)界面剪切應(yīng)力分布，分析了鋁層和鋼層厚度比變化的原因。結(jié)果表明：在特定壓下率(rcon)條件下，從軋制入口到出口變形區(qū)鋁層與鋼層厚度比呈先減小后保持基本不變的變化趨勢；當(dāng)壓下率r＜rcon或r＞rcon時，鋁層和鋼層厚度比(RA/S)呈先減小后增加的變化趨勢；當(dāng)初始鋁帶厚度由0.50 mm減小至0.10 mm時，rcon由45%減小至30%；隨著壓下率的增加，變形區(qū)界面剪切應(yīng)力增大，該剪切應(yīng)力使鋁層與鋼層之間發(fā)生相對滑動(r＜rcon)、無相對滑動(r=rcon)和粘著流動(r＞rcon)；僅當(dāng)壓下率r＞rcon時，拉伸斷口鋁層與鋼層不分層，復(fù)合帶材具有良好的界面結(jié)合狀態(tài)。

The embedded aluminum-steel composite sheet was prepared by cold roll bonding (CRB) process. The influences of rolling reduction and initial thickness of aluminum strip on the thickness ratio of aluminum-steel in the deformation zone were investigated. The interfacial shear stress distribution in the deformation zone was calculated and the thickness variation of aluminum layer and steel layer was explained. The results show that the thickness ratio of aluminum-steel (RA/S) in the deformation zone from entrance to exit initially decreases and then remains unchanged under certain reduction rcon. While the reduction is higher or lower than rcon, RA/S initially decreases, and then increases. When the initial thickness of aluminum strip reduces from 0.50 mm to 0.10 mm, rcon decreases from 45% to 35%. With the increase of reduction, the interfacial shear stress increases, resulting in that relative sliding (reduction＜rcon), non-relative sliding (reduction=rcon) and adhesive shearing (reduction＞rcon) occur successively on the interface of the aluminum and steel layer. The composite strip has a good interfacial bonding quality, and there are no delamination of aluminum layer and steel layer on the tensile fracture when the reduction is higher than rcon.

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