Microstructural and interface geometrical influence on the mechanical fatigue property of aluminum/high-strength steel lap joints using resistance element welding for lightweight vehicles: experimental and computational investigation

• DOI: 10.1016/j.jmrt.2022.01.041
• Publication Date: 2022-01-15T11:42:05Z
• Authors: Seungyeop Baek; Gun Yung Go; Jong-Wook Park; Jongho Song; Hyun-chul Lee; Seung-Joon Lee; Sangmin Lee; Chuantong Chen; Min-Su Kim; Dongjin Kim
• Keywords: Recrystallization (geology)

The present study investigates a fatigue property and its microstructural interface geometrical effect on the resistance element welded (REWed) aluminum (Al)/high-strength steel (Fe) lap joint. assembled Al/Fe joints were subjected under strength up to 80% of tensile-shear loads with 0.1 load ratio. As result, an exceptional has been secured inducing base material fracture because there are no noticeable interfacial defects at 10.5 kA welding condition compared assemblies joined 3.5–4.5 currents. Even, maximum exceed 9 kN condition. Microstructural developments materials interfaces thoroughly analyzed by optical microscopy (OM) electron backscatter diffraction (EBSD), development prior-austenite-grain-boundaries (PAGBs) α'-martensite phases observed in all conditions. Heat affected zone (HAZ) AA5052 quantitatively terms recrystallization grain growth, providing significant differences performances striation, crack propagation developments. In addition, help finite (FE) computational modeling, mechanical stress distribution strain behavior geometries joining discussed detail.