Comparing hydrogen embrittlement behaviors of two press hardening steels: 2 GPa vs. 1.5 GPa grade. (10th October 2022)

• Record Type: Journal Article
• Authors: Cao, Z.H.; Zhang, B.N.; Huang, M.X.
• Is Part Of: Journal of materials science & technology. Volume 124(2022)
• Page Start: 109
• Page End: 115
• Publication Date: 2022-10-10
• Subjects: Press hardening steels -- Hydrogen embrittlement -- Fracture toughness -- Martensite; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.02.020
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: PHS2000 exhibits a higher susceptibility to hydrogen embrittlement than PHS1500. PHS2000 has a lower fracture toughness than PHS1500, despite it has a better tensile property. PHS2000 cannot offer any weight saving over PHS1500 when hydrogen content is higher than ∼0.5 wppm. Abstract: The hydrogen embrittlement (HE) behaviour and fracture toughness of two press hardening steels (PHS) with different strength grades (2 GPa and 1.5 GPa, designated as PHS2000 and PHS1500) were systematically compared. It is found that the higher carbon content in PHS2000 contributes to its high strength yet deteriorates its fracture toughness. Meanwhile, the hydrogen-induced adverse effects on fracture stress and fracture toughness are more intense in PHS2000 than in PHS1500. Consequently, if both are applied in a harsh corrosion environment (∼0.5 wppm), PHS2000 cannot offer any weight-saving over PHS1500. Abstract : Image, graphical abstract