Crack growth rate in hydrogen pre-charged martensitic steels during slow strain rate tests. (29th April 2023)

• Record Type: Journal Article
• Authors: Shi, Jie; Yu, Wenchao; Sun, Ting; Xu, Le; Li, Xiaoyuan; Wang, Maoqiu
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 36(2023)
• Page Start: 13699
• Page End: 13704
• Publication Date: 2023-04-29
• Subjects: Martensitic steel -- Slow strain rate test -- Crack growth rate -- Hydrogen pre-charging -- Nano-sized precipitate; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.12.271
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Crack growth rate in two high strength martensitic steels with the Mo contents of 0.43 wt.% and 1.06 wt.% was investigated by means of slow strain rate tests (SSRT) on compact tensile specimens after hydrogen pre-charging. It was found that the crack growth rate increased and the values of stress intensity factors K IH and K Imax decreased with the increase of pre-charged hydrogen concentration. The steel with higher Mo content showed much lower crack growth rate than the steel with lower Mo content. It could be attributed to more nano-sized precipitates that can act as the hydrogen trapping sites and mitigate hydrogen deleterious effects on crack growth rate and the K IH and K Imax values. Highlights: Crack growth rate increased with increasing pre-charged hydrogen concentration. K IH and K Imax decreased with increasing pre-charged hydrogen concentration. Higher Mo-containing steel showed lower crack growth rate. Nano-sized precipitates can act as the hydrogen trapping sites.