Hydrogen blistering and hydrogen-induced fracture of rail steel

Citation
Wy. Chu et al., Hydrogen blistering and hydrogen-induced fracture of rail steel, STEEL RES, 72(2), 2001, pp. 66-70
Citations number
15
Categorie Soggetti
Metallurgy
Journal title
STEEL RESEARCH
ISSN journal
01774832 → ACNP
Volume
72
Issue
2
Year of publication
2001
Pages
66 - 70
Database
ISI
SICI code
0177-4832(200102)72:2<66:HBAHFO>2.0.ZU;2-6
Abstract
Hydrogen blistering, hydrogen-induced plasticity loss (HIPL) under slow str ain rate test and hydrogen-induced cracking or fracture (HIC) under constan t load for rail steel were evaluated. The threshold diffusible hydrogen con centrations for blistering, HIPL and HIC were 2.03 ppm, 0.26 ppm and 0.24 p pm, respectively. During charging, blistering formed first and fissure init iated at the wall of the blistering. HIPL (I-delta) was found to decrease l inearly with the reciprocal of the diffusible hydrogen concentration (C-0), i.e. /(delta) = 105 - 27/C-0. The threshold stress for HIC (sigma (c)) in MPa decreases linearly with In C-0 in ppm i.e., sigma (c) = 642 - 284 In C- 0.