Delayed Fracture Evaluation of High-strength Steel Sheets Using the Hydrogen Permeability

The application of high-strength steel sheets in automobiles has been increased to achieve low bodyweight and simultaneously enhance crashworthiness. High-strength are susceptible hydrogen embrittlement it is essential evaluate their delayed fracture resistance for appropriate use. Delayed typically evaluated using the relationship between amount diffusible strength obtained from a constant load test slow strain rate technique (SSRT). It difficult monitor invading environment; thermal desorption analysis not non-destructive obtain easily desorbed specimens. permeation monitors invasion hydrogen. In this study, we permeability test. As result, relationships permeability, mechanical properties SSRT, brittle surface ratio were found be consistent among various conditions, such as under charging corrosive environments. Furthermore, little was detected Thus, its proves effectiveness method.