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Analysis and modeling of the growth of intermetallic compounds in aluminum–steel joints

机译：铝钢接头中金属间化合物的生长分析和建模

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In this work, we experimentally and numerically studied the microstructures and growth of intermetallic compounds (IMCs) formed in Al–Fe (aluminum–steel) joints welded by a pulsed double electrode gas metal arc welding (DE-GMAW)-brazing method. The IMCs consist of Fe2Al5 and FeAl3, with Fe2Al5 being the main compound in the joints. The thickness of an IMC layer increases with an increase of the welding current (heat input) into the base metal. EBSD measurement suggests that the preferred crystal orientation of the Fe2Al5 IMC likely provides the necessary path for Al atoms to migrate through the IMC layer for further growth of the Fe2Al5 IMC layer toward the steel substrate. The Monte Carlo method was used to simulate growth of the IMCs in the joints. Numerical results are in good accord with the experimental results, suggesting that Fe2Al5 IMC is first formed in the initial brazing interface between liquid Al and steel substrate, and then the interface between the liquid Al and steel substrate evolves into two new interfaces: one is an interface between the Fe2Al5 IMC layer and the steel substrate, and the other is an interface between the Fe2Al5 IMC layer and liquid Al. During growth of the Fe2Al5 IMC, FeAl3 IMC forms in the interface between the Fe2Al5 IMC layer and the Al and then grows into the Al. The thickness of the Fe2Al5 layer increases nonlinearly with an increase in the growth time.
机译：在这项工作中，我们通过实验和数值研究了通过脉冲双电极气体金属电弧焊（DE-GMAW）-钎焊方法焊接的Al-Fe（铝-钢）接头中形成的金属间化合物（IMC）的组织和生长。 IMC由Fe 2 Al 5 和FeAl 3 < / small>，其中Fe 2 Al 5 是关节中的主要化合物。 IMC层的厚度随着进入母材的焊接电流（热输入）的增加而增加。 EBSD测量表明，Fe 2 Al 5 IMC的首选晶体取向可能为Al提供了必要的路径原子通过IMC层迁移，从而使Fe 2 Al 5 IMC层进一步向钢基底生长。蒙特卡洛方法用于模拟关节中IMC的生长。数值结果与实验结果吻合较好，表明Fe 2 Al 5 IMC首先形成液态铝和钢基底之间的初始钎焊界面，然后液态铝和钢基底之间的界面演化为两个新界面：一个是Fe 2 之间的界面Al 5 IMC层和钢基底，另一个是Fe 2 Al 5 IMC层和液态Al。 Fe 2 Al 5 IMC生长期间，FeAl 3 IMC在Fe 2 Al 5 IMC层与Al之间的界面中形成，然后成长为铝。 Fe 2 Al 5 层的厚度随着生长时间的增加而非线性增加。

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