Microstructure evolution and fracture analysis of hot-rolled explosive-welded 06Cr13/Q345R composites

Abstract

In this paper, with electron backscatter diffraction (EBSD) and SEM, the microstructure evolution and fractography of bonded interfaces were analyzed at various reduction rates (0, 15, 30, 40, 50 and 60) %. A 06Cr13/Q345R explosive-welded composite interface of 50-80 μm was the impact area of explosive cladding where the grains of 06Cr13 and Q345R were both low-sized and uniform. Subsequent to hot rolling, the explosive-welding effect on the 06Cr13-side interface was rapidly weakened. Compared to the 06Cr13-steel side, the explosive-cladding effect on the Q345R-side interface was slowly weakened. A continuous orientation distribution occurred, which indicated that a continuous, dynamic recrystallization mechanism existed in the explosive-welded composite plate. In contrast, the dominant recrystallization-deformation mechanism was the discontinuous, dynamic recrystallization, taking place under the rolling deformation. Two peaks existed between the 30-% reduction rate and the 60-% reduction rate, and they were apparently at positions <15°and 50°-60°. As the rolling reduction rate increased, the two materials were significantly bonded together and the interface diffusion distances of the peaks and valleys decreased and tended to be homologous, whereas the composite interface fault was increasingly less apparent.

Profile Change Law of Clad Rebars and the Formation Mechanism of Composite Interfaces during Hot Rolling

“…Interestingly, the proportion of recrystallized grains at the stainless-steel side of each specimen is greater than that at the carbon-steel side, likely because of the higher deformation and internal grain storage energy of the clad stainless steel during the rolling process. A similar law was found by Li et al in their study on the interfacial structural properties of 06Cr13/Q345R composite plates [ 28 ].…”

Electron Backscatter Diffraction Investigation of Heat Deformation Behavior of 2205 Duplex Stainless Steel

“…It can be used to explore the deformation law of materials by analyzing the orientations, deformation, and texture of grains. [16][17][18][19] This paper uses EBSD to study the hot compression of 2205 duplex stainless steel, explores the microstructure characteristics of different deformation conditions and different deformation regions, studies the DRX mechanism of the two phases, and clarifies the relationship between the texture and DRX.…”