Comparison of segregated phosphorous and sulfur effects on the fracture mode and ductility of iron tested at cathodic potentials

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(82)90282-4· OSTI ID:5858623

Jones, R H; Bruemmer, S M; Thomas, M T; Baer, D R

Fracture mode and ductility observations of iron doped with phosphorus have clearly demonstrated that phosphorus at the grain boundaries of iron is less effective than sulfur in promoting intergranular fracture when tested in H/sub 2/SO/sub 4/ at cathodic potentials. A grain boundary phosphorus concentration of 0.21 monolayers was insufficient to cause intergranular fracture of iron at cathodic test potentials ranging from -0.5V to -1.0V (SCE) while it was observed previously that a grain boundary sulfur concentration of 0.13 monolayers was sufficient to cause intergranular fracture of iron tested at -0.6V and -0.75V (SCE). Phosphorus is frequently observed at the grain boundaries of temper embrittled steels and temper embrittled steels have been shown to be more susceptible to hydrogen embrittlement than non-temper embrittled steels. Therefore, the present study was undertaken to evaluate the effect of segregated phosphorus on the intergranular fracture and embrittlement of iron tested at cathodic potentials.

• Research Organization: Pacific Northwest Lab., Richland, WA
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5858623
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 16; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
CATHODES
CRYSTAL STRUCTURE
DUCTILITY
ELECTRODES
ELEMENTS
EMBRITTLEMENT
FRACTURE PROPERTIES
GRAIN BOUNDARIES
IRON
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NONMETALS
PHOSPHORUS
SEGREGATION
SULFUR
TENSILE PROPERTIES
TRANSITION ELEMENTS