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Erschienen in: Journal of Materials Engineering and Performance 12/2022

20.06.2022 | Technical Article

Insights on Microstructure and Failure Characteristics of Resistance Spot Welds of Galvannealed Dual Phase Steel

verfasst von: Kaushal Kishore, Pankaj Kumar, Goutam Mukhopadhyay

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 12/2022

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Abstract

This work examines the effect of spot-welding current on the load-bearing capacity and the fracture mechanism of galvannealed dual-phase steel (DP600) joints. A greater than three-fold increase in the load-bearing capacity of the joint was achieved by increasing the welding current from 6 to 9 kA. Quantitative fractography showed a transition from predominantly transgranular cleavage fracture at 6 kA current with only ~7 dimples to ~17% ductile dimples at 7 kA current and eventually 100% ductile dimples for 9 kA current. Detailed microstructure-hardness relationship across the different welding zones is presented using scanning electron microscopy and electron backscattered diffraction techniques. At the optimized welding parameter, load-controlled fatigue tests revealed a decrease in the number of cycles to failure with increasing load amplitude, and endurance was achieved for 10% of the maximum tensile-shear load-bearing capacity. Investigation of failed specimens revealed that while under tensile loading conditions, crack initiated from the base metal, fatigue crack initiated from the heat-affected zone. Also, the possibility of different categories of liquid metal embrittlement cracks are discussed.

Graphical Abstract

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Metadaten
Titel
Insights on Microstructure and Failure Characteristics of Resistance Spot Welds of Galvannealed Dual Phase Steel
verfasst von
Kaushal Kishore
Pankaj Kumar
Goutam Mukhopadhyay
Publikationsdatum
20.06.2022
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 12/2022
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-022-07060-4

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