(a, b) Microscopic images of the advanced high-strength strength DP590 steel composed of the tempered martensite (M) in the ferrite (F) base; (c, d) scanning electron microscopy images of the advanced high-strength DP590 steel at various magnifications.

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(a, b) Microscopic images of the advanced high-strength strength DP590 steel composed of the tempered martensite (M) in the ferrite (F) base; (c, d) scanning electron microscopy images of the advanced high-strength DP590 steel at various magnifications.

2021, vol.28,no.6,pp.1022-1029.

Improvement of the microstructural features and mechanical properties of advanced high-strength steel DP590 welds .

Figures of the Article

(a, b) Microscopic images of the advanced high-strength strength DP590 steel composed of the tempered martensite (M) in the ferrite (F) base; (c, d) scanning electron microscopy images of the advanced high-strength DP590 steel at various magnifications.
Real cross-section macrographs of P3 and Sa3 samples. The red and green double arrows show the diameters of the nugget and the spot weld, respectively.
Microstructures of single- and secondary pulsed welded AHSS DP590 etched with 4vol% nital: (a) weld zone mostly consisting of tempered martensitic structure and (b) HAZ mainly consisting of a tempered martensitic structure and low ferrite in the P3 sample exposed to secondary pulsed welding marked with symbols A and B in Fig. 2; (c) weld zone mainly containing a rough martensitic structure and (d) HAZ mainly composed of a rough martensitic structure and directional ferrite in the Sa3 sample exposed to single-pulsed welding marked with symbols C and D in Fig. 2.
SEM images of the DP590 steel samples: (a) weld zone and (b) HAZ of sample P3 subjected to the secondary pulsed welding; (c) weld zone and (d) HAZ of sample Sa3 subjected to the single pulsed welding.
Microhardness profiles of the secondary pulsed P4 sample and the single-pulsed Sa4 sample.
(a) Comparative diagram of the absorbed energy for the secondary pulsed welding and the single-pulsed welding; comparative diagrams of the tensile shear curves of all the welded DP590 steel samples: (b) secondary pulsed and (c) single-pulsed.
Comparison of the cross tension of the Sa3 and P3 samples in the current of 8 kA.
Effect of current on the diameter of the nugget for the single- and secondary pulsed welded samples.

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