Abstract
Reducing carbon emissions has been a major focus in the automobile industry to address various environmental issues. In particular, studies on parts comprised of high strength sheets and light car bodies are ongoing. Accordingly, this study examined the use of boron steel, which is commonly used in high strength sheets. Boron steel is a type of sheet used for hot stamping parts. Although it has high strength, the elongation is inferior, which reduces its crash energy absorption capacity. To solve this problem, two sheets of different thickness were welded so the thin sheet would absorb crash energy and the thick sheet would work as a support. Boron steel, however, may show weakening at the welding spot due to the Al-Si coating layer used to prevent oxidation from occurring during the welding process. Therefore, a certain part of the coating layer of a double-thickness boron steel sheet that is welded in the hot stamping process is removed through laser ablation, and the formability of the hot-work was examined.
Highlights
As the automobile industry affects human safety directly, the focus of this study is on the development of car bodies with sufficient hardness and lightness
For boron steel welded after laser ablation under each condition, 6 specimens were machined according to ASTM E 8M
Three tensile tests were performed on each sample before and after die quenching
Summary
As the automobile industry affects human safety directly, the focus of this study is on the development of car bodies with sufficient hardness and lightness. As environmental problems become an important issue around the world, the automobile industry is paying close attention to greenhouse gas regulations and the lightweight design of car bodies to improve fuel efficiency. Many studies have examined the hot stamping process [1,2,3,4,5]. Among these are studies on martensite generation depending on the temperature [6], the effects of forming methods on hot processing [7], the influence of spring back, the residual stress on the products, and so forth [8]
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