Effects of hydrogen on notch ductility and fracture in spheroidized AISI 1090 steel

Notched bend specimens were tested after precharging or during dynamic charging with hydrogen. In the precharged case, hydrogen was shown to decrease markedly the critical strains for the onset of sh ear instability at the notch surface and for cracking in a mode II fracture. Dynamic charging was found to produce severe degradation in the form of a mode I fracture, independent of whether prior precharging was performed. The interactions of hydrogen with macroscopic plastic flow parameters were determined. Formerly Graduate Student at The Ohio State University.