Analysis of friction, wear and oxidation behaviour of X40CrMoV5/Fe360B steel couple in an open-sliding contact

Abstract

In hot-forming processes, the interface tool/product is important for the quality of the finished product surfaces. Consequently, it is important to better understand the phenomena, namely, oxidation, which occurs at the interface between tool and sheet in this kind of process. It is in this context that an experimental program was conducted to analyse friction, wear and oxidation behaviours on the tribological performance of the combination of tool and sheet. A high-temperature pin-on-disc tribometer, with an original open-sliding contact, was used. Pins, representing tools are X40CrMoV5 high-alloyed steel, and discs, representing drawing products, are Fe360B steel plates (EN 10025–S235JRG2). The friction and wear study of the combination was carried out at temperatures ranging from ambient (room temperature) to 800℃ and within a normal load range of 35–140 N. Regarding oxidation effect and wear mechanisms, they are examined and characterized by scanning electron microscope and energy-dispersive X-ray spectrometer. As for the experimental results, they showed that the increase in temperature involves the decrease in the friction coefficient due to the oxide scales for all the tests. Pre-oxidized discs are also tested. It was found that the wear process is characterized by an adhesive wear with a transfer of oxides on the pins.

Service Behavior of Nitride Layers of Steels for Military Applications

“…The temperature-dependence of COF can be attributed to the creation of oxides in the wear trace. As is described in the literature [28,29], oxides created in contact surfaces act like a thin protective slide layer with a lower value of friction coefficient. In the process of wear, some macroparticles are ripped out of the surface of thin layers and cause the increase in surface degradation.…”

Tribological effects of chlorine-free lubricant in strip drawing of advanced high strength steel

“…A common way to investigate the tribological effects in sheet metal forming is using tribotesters that can measure some specific factors and locations providing similar conditions to those of real productions. 32–40 In this research, a strip drawing tribotester was used to test the tribological performance of different lubricants under two sliding speeds. The friction and wear results were examined to better understanding the tribological characteristics of the chlorine-free lubricant in sheet metal forming of AHSS.…”