Abstract
Hot stamping by partition heating of Al–Si coated boron steel sheets is currently utilized to produce parts of the car body-in-white with tailored microstructural and mechanical characteristics. This paper investigates the evolution of the Al–Si coating and its tribological and wear performances in the case of direct heating at the process temperatures of 700 °C, 800 °C, and 900 °C, skipping the preliminary austenitization as it may happen in the case of tailored tempered parts production. A specifically designed pin-on-disk configuration was used to reproduce at a laboratory scale the process thermo-mechanical cycle. The results show the morphological and chemical variation of the Al–Si coating with heating temperature, as well as that the friction coefficient, decreases with increased temperature. Furthermore, the results proved that the adhesive wear is the main mechanism at the lower temperature, while abrasive wear plays the major role at the higher temperature.
Highlights
Hot stamping of boron steel sheets has become the most popular technology for producing components of the car body-in-white, in order to meet the increasing demands for the reduction of the vehicle weight and the improvement of passenger safety [1]
During the conventional hot stamping process, the sheets of quenchable boron steel 22MnB5 are usually provided with an Al–Si coating in order to prevent scale formation and decarburization when furnace heated before stamping [2]
Ghiotti et al [22,23] proposed a novel approach to wear testing during hot stamping of boron steel sheets, using a universal tribometer equipped with a pin-on-disk configuration and an electrical furnace, capable to reproduce on the pin the same heating and cooling cycles experienced by the tools during the industrial hot stamping process
Summary
Hot stamping of boron steel sheets has become the most popular technology for producing components of the car body-in-white, in order to meet the increasing demands for the reduction of the vehicle weight and the improvement of passenger safety [1]. The conventional hot stamping process presents some evident advantages compared to conventional stamping at room temperature, such as formability improvement, forming load reduction, and spring-back decrease [3] It makes it possible to manufacture components with tailored microstructure [4], and with different mechanical properties on different zones, enhancing their functionality. Ghiotti et al [22,23] proposed a novel approach to wear testing during hot stamping of boron steel sheets, using a universal tribometer equipped with a pin-on-disk configuration and an electrical furnace, capable to reproduce on the pin the same heating and cooling cycles experienced by the tools during the industrial hot stamping process They utilized this equipment to investigate the tribological behaviour and wear characteristics during conventional hot stamping of Al–Si coated boron steel sheets [24,25]. The influence of the heating temperature on the tribological characteristics and wear mechanisms at increasing number of cycles is evaluated and analyzed by means of SEM, EDX, 3D profiler, and weight measurement analyses
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