|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||Revisit the Slow Strain Rate Test for Hydrogen Embrittlement of Press-hardened Steel
||Zuoheng Cao, MingXin Huang
|On-Site Speaker (Planned)
Hydrogen embrittlement (HE) is a prevailing issue in advanced high strength steel (AHSS). The slow strain rate test (SSRT) method after electrochemically hydrogen charging is widely acknowledged to investigate the HE susceptibility. However, the present work shows that SSRT may not be an ideal method to characterize the investigated press-hardened steel (PHS). The inclusions in this material deteriorates the HE performance extensively, whereas their existence is inevitable due to manufacture limitations. The conventional strain rate test (CSRT) method is applied to circumvent the uncertainty and scattering caused by inclusions. The strength degradation first increases with hydrogen content and holds constant after hydrogen saturation, which implies the critical hydrogen concentration where HE initially takes place and its prevalence afterwards. The current results show that, for inclusion-containing high-strength steels, CSRT serves as a more accurate method than traditional SSRT to characterize the HE related properties.