Development of steel for hot stamping of 22mnb5 steel by joule effect heating

With the increase in demand and development of the automobile sector, where it becomes important to improve the efficiency of energy consumption of vehicles, one can observe the need for materials that are both light and have high mechanical strengths. The Ultra High Strength Steel (UHSS), which include TWIP (Twinning-Induced-Plasticity) and Hot Stamping are characterized by unique microstructures and metallurgical properties that allow car manufacturers to meet the diverse functional requirements of vehicles. Boron steel is suitable for mechanical hot forming. In the last few years, hot stamped parts have occupied a prominent place in the bodies of bodies due to being in line with the demands mentioned above. There is a lot of research under development for this technology, be it in materials, means of production, coatings and applications. Currently, there is a patent that generates a technological restriction for the processing of hot stamping; in which it is to use boron steel with Al-Si metallic coating and heating the blank to be hot stamped through a radiation furnace. The objective of this work is to use a new processing alternative through another metallic diffusion coating of Fe-Zn and heating of the blank to be hot stamped by Joule effect; generating an industrial experiment and prototyping for characterization. The results showed the feasibility of using boron steel with Fe-Zn diffusion coating in hot forming applications by heating by Joule effect, with good surface quality, meets the mechanical properties and microstructure, without cracks in the steel, excellent adhesion of the paint layer and good resistance to corrosion.