The Effect of Multi-Pass Drawing on Hydrogen Embrittlement of SUS316L

Global warming and other environmental problems have been caused by the use of fossil fuels, which have been widely used worldwide.Fossil fuels are easy to use, but they have the disadvantage of emitting carbon, which leads to problems such as global warming.Several countries are working to implement renewable energy sources, such as hydrogen energy, in order to lower carbon emissions.Hydrogen energy requires pipes and tanks for transportation and storage.However, using the existing facilities causes hydrogen embrittlement.Therefore, research on the development and application hydrogen-resistant materials with good corrosion resistance is actively being conducted to prevent hydrogen embrittlement.Research on the mechanical and material properties of various hydrogen-resistant materials has been actively conducted for cold-rolled sheets, but research on drawn bars is almost non-existent.Thus, on multi-pass drawn SUS316L bars, the changes in mechanical and material properties were studied before and after drawing as well as before and after hydrogen charging.In addition, this study derived a relationship between the Micro-Vickers hardness and yield strength of specimens with and without hydrogen charging.To compare the actual hardness values obtained through the multi-pass drawing process and the values converted to hardness from effective strain, ABAQUS and DEFORM, two programs for finite element analysis, were utilized.This research compared the effectiveness of a strain data of the drawn material from the two FEA tools, converted it to hardness, and compared and analyzed it with the actual measurement data.To increase the safety and dependability of hydrogen energy infrastructure, the study's findings offer insightful information about the mechanical and material characteristics of drawn SUS316L bars.