Effect of explosive welding on the interface characteristics of S32750/Q245R composite plate

ABSTRACT

Super duplex stainless steel S32750 has excellent corrosion resistance. It is combined with carbon structural steel Q245R through explosive welding, not only with good mechanical properties but also with a satisfactory economic cost. In this paper, the characteristics of the bonding interface of S32750/Q245R explosive welding composite plate were analyzed. The interface of the composite plate exhibits a consistent wavy bonding interface with vortices. The adiabatic shear band was only observed on the S32750 plate side near the bonding interface, while defects such as pores, cracks, and inclusions were also detected at the bonding interface. The EBSD analysis revealed the presence of a layer of fine-grained grains close to the interface of the S32750 side, and the grains beyond this fine-grained layer were elongated and shaped like fibers. The largest plastic deformation occurs near the interface on the super duplex stainless steel side. The microhardness test results indicate that the highest hardness presents near the interface of the S32750/Q245R composite plate side, with the hardness being slightly higher at the wave waist than the wave peak and trough. The hardness of the composite plate showed a decreasing trend from the bonding interface to the plate edges on both sides.

Graphical abstract

KEYWORDS:

• Explosive welding
• bonding interface
• S32750/Q245R composite plate

Acknowledgements

Analysis and Test Center of Hefei University of Technology was acknowledged for providing characterizations.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.