High-Productivity and High-Strength Fe/Al and Al/Al Dissimilar Joining by Spot Forge-Welding
High-Productivity and High-Strength Fe/Al and Al/Al Dissimilar Joining by Spot Forge-Welding
复制标题
DOI：
10.1007/s11661-020-06118-z
复制
发表时间：
2021-01-02
影响因子：
2.8
通讯作者：
Yamagishi, Hideki
中科院分区：
文献类型：
--
作者：
Yamagishi, Hideki
为了实现可用于汽车生产线的异种材料的高速和高强度连接，使用点焊检查两种类型的异种搭接连接。材料组合为高强度钢SPFC 980 x铝（Al）合金AA 5083和Al合金AA 2024 x Al合金AA 6061。通过具有塑性流动的扩散结合，处理时间小于0.1秒。接头强度取决于表示塑性流动程度的压缩比（R），并且在SPFC 980 x AA 5083中，接头在R > 1.8时在基体金属（BM）中断裂，在AA 2024 x AA 6061中，接头在R > 1.4时断裂。在每种情况下，最大拉伸剪切载荷达到约4 kN。横截面显示锻造区域的冶金连接。对SPFC 980 x AA 5083接头横截面中的元素氧进行电子探针显微分析，发现在结合界面处的污染层随着R的增加而减少;通过塑性流动形成新表面在锻造中心比在边缘处发生得更好。在BM断裂的R条件下，两种组合都具有适合异种连接的固态结合界面。在SPF 980 × AA 5083接头的结合界面处的反应层（RL）被抑制到几纳米的厚度。在AA 2024 x AA 6061接头的结合界面处没有形成明显的RL;边界显示出与BM晶界相似的高结晶度。这些结果可以促进下一代固态点焊系统的发展，能够多材料制造的运输车辆。
To realize high-speed and high-strength joining of dissimilar materials that can be used in an automobile manufacturing line, two types of dissimilar lap-joining were examined using spot forge-welding. The material combinations were high-tensile steel SPFC980 x aluminum (Al) alloy AA5083 and Al alloy AA2024 x Al alloy AA6061. The processing time was less than 0.1 second via diffusion bonding with plastic flow. Joint strength depended on the reduction ratio (R), which indicates the degree of plastic flow, and the joints fractured in base metal (BM) at R > 1.8 in the SPFC980 x AA5083 and at R > 1.4 in the AA2024 x AA6061. In each case, the maximum tensile-shear load reached approximately 4 kN. Cross-sections showed metallurgical joining in the forged area. Electron probe microanalysis for elemental oxygen in cross-sections of SPFC980 x AA5083 joints revealed that the contamination layer at the bonded interface decreased with increasing R; formation of new surface by plastic flow occurred better at the forged center than at the edge. Under the R condition for BM fracture, both combinations had suitable solid-state bonding interfaces for dissimilar joining. The reaction layer (RL) at the bonded interface of the SPF980 x AA5083 joint was suppressed to a thickness of several nanometers. No distinct RL formed at the bonded interface of the AA2024 x AA6061 joint; the boundary showed high crystallinity similar to that of the BM grain boundary. These results may facilitate the development of next-generation solid-state spot-welding systems capable of multimaterial manufacturing for transportation vehicles.