Abstract
Loading frequency effects on FCGR and fracture surface morphology were investigated on a hydrogen-charged specimen of a pre-strained low carbon steel. Test results showed difference tendency of loading frequency effects between charged-hydrogen and hydrogen environment. Tests in a low pressure nitrogen showed that decreasing loading frequency revealed increasing FCGR. However, in a hydrogen gas FCGR revealed decreasing tendency as well as an uncharged specimen. Fracture surface morphology showed that the change of FCGR in this region related to the transition of ductile to brittle-like fracture surface or the reverse.
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