Hierarchically patterned multiphase steels created by localised laser treatments

Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching

“…Schematic diagrams of the bending fracture mechanism in the specimen treated by LCQ and LDQ Similarly, the fracture mechanism of 2# specimen by LDQ can be summarized as the following three stages, as shown in Figure 18-2. In the external loading condition, σa axial stress along the tensile direction will first be transferred from the hardened units to the substrate units, resulting in the stress redistribution of the biomimetic specimens [29]. As far as the hardened units were concerned, the stress redistribution not only exists in the tensile direction, but also redistributes the shear stress perpendicular to the quench-substrate boundary profile, which contributes to the resistance to the shear stress concentration [30].…”