Abstract
The objective of this study was to fill a knowledge gap about the effect of cut-edge properties on hydrogen embrittlement (HE) of a cold rolled Fe-20Mn-0.35C-1Al-1.6Cr TWIP (twinning induced plasticity) steel. Slow strain rate tests were performed on hydrogen uncharged and hydrogen pre-charged specimens prepared by four cutting methods: electrical discharge machining, laser cutting, abrasive waterjet cutting, and blanking. It was observed that the laser-cut and hydrogen pre-charged specimens showed the highest total elongation (62%) during tensile test, whereas the blanked and hydrogen pre-charged specimens showed the lowest total elongation (30%). The high HE susceptibility of blanked specimens was explained by the local high dislocation density assisted by the hydrogen-enhanced localized plasticity mechanism. Furthermore, tensile residual stresses generated by blanking facilitated the hydrogen diffusion and the growth of hydrogen-assisted cracks.
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