(1. 北京科技大學(xué) 材料先進(jìn)制備技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083；
2. 北京科技大學(xué) 現(xiàn)代交通金屬材料與加工技術(shù)北京實(shí)驗(yàn)室，北京 100083；
3. 銀邦金屬?gòu)?fù)合材料股份有限公司 江蘇省金屬層狀復(fù)合材料重點(diǎn)實(shí)驗(yàn)室，無(wú)錫 214145)
摘 要: 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(duì)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(jì)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(shì)；當(dāng)壓下率r＜rcon或r＞rcon時(shí)，鋁層和鋼層厚度比(RA/S)呈先減小后增加的變化趨勢(shì)；當(dāng)初始鋁帶厚度由0.50 mm減小至0.10 mm時(shí)，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(duì)滑動(dòng)(r＜rcon)、無(wú)相對(duì)滑動(dòng)(r=rcon)和粘著流動(dòng)(r＞rcon)；僅當(dāng)壓下率r＞rcon時(shí)，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)。
關(guān)鍵字: 嵌入式鋁/鋼復(fù)合帶材；軋制復(fù)合；厚度比；結(jié)合性能
（1. Key Laboratory for Advanced Materials Processing, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China;
3. Jiangsu Key Laboratory for Clad Materials, Yinbang Clad Material Company Limited, Wuxi 214145, China）
Abstract: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.
Key words: embedded aluminum-steel composite sheets; cold roll bonding; thickness ratio; bonding property
