Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 45, Issue 7, Pages 2047-2057Publisher
WILEY
DOI: 10.1111/ffe.13719
Keywords
aluminum alloy; fatigue behavior; fracture mechanism; high strength steel; intermetallic compound (IMC); resistance spot welding
Funding
- National Natural Science Foundation of China [51275204]
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This study investigates the microstructures and fatigue behavior of dissimilar resistance spot welded joint between 5083 aluminum alloy and DP980 high strength steel, and finds that the fatigue load level affects the fracture mode.
The microstructures and fatigue behavior of dissimilar resistance spot welded joint between 5083 aluminum alloy and DP980 high strength steel are studied. Al/steel joint has fusion-brazing characteristics composed of Al nugget and intermetallic compound (IMC) layer. The microstructure, microhardness, static tensile/shear property, and fatigue test of welded joints are carried out. The number of fatigue cycles increases with the decreasing of load level, and the fatigue limit load is 1.08 kN about 21% of static tensile/shear force. The fatigue test results reveal that different fatigue load levels lead to different fracture mode. It can be summarized as nugget pullout failure (fatigue load > 3.5 kN), interfacial failure (1.5 kN < fatigue load < 3.5 kN), and aluminum alloy base metal fracture (fatigue load < 1.5 kN). Furthermore, the fatigue fracture mechanism under different load levels is analyzed.
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