Effects of sulfur and hydrogen on intergranular fracture of iron

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6490533

Shin, K S; Meshii, M

The fracture stress of polycrystalline iron at 77/sup 0/K was studied as a function of the grain boundary segregation of sulfur and hydrogen. In the case of permanent hydrogen damage, the effects of these elements were found to be independent and additive with a relation, sigma/sub F/ (MPa) = 573 - 16C/sub s/ - 2.42 C/sub H/, where C/sub s/ and C/sub H/ are the percentage of a monolayer of sulfur at the intergranular surface and the atomic percent of hydrogen at grain boundaries, respectively. This relation was valid in cases when sulfur and hydrogen coexisted or sulfur existed alone. These observations were analyzed using a modified Griffith equation and sulfur and as-quenched hydrogen concentrations at grain boundaries were related to the fracture energy and the size of microcrack, respectively. The reversible hydrogen effect was also studied at various grain boundary concentrations of hydrogen and sulfur. No evidence of synergistic effect between hydrogen and sulfur was found in this study.

• Research Organization: Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: AC02-76ER01367
• OSTI ID: 6490533
• Report Number(s): DOE/ER/01367-156; CONF-8402158-2; ON: DE86001885
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
CRYSTAL STRUCTURE
ELEMENTS
EMBRITTLEMENT
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HYDROGEN
HYDROGEN EMBRITTLEMENT
IRON
LOW TEMPERATURE
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NONMETALS
SEGREGATION
SULFUR
TRANSITION ELEMENTS