Hydrogen embrittlement of nickel

Thesis/Dissertation · Mon Dec 31 23:00:00 EST 1984

OSTI ID:6323865

Lassila, D H

Experiments were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of Cottrell atmospheres of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored. Results show that the parameters affecting the diffusive segregation of hydrogen to grain boundaries play a fundamental role in conditions that result in embrittlement. If a sufficient quantity of hydrogen at grain boundaries is attained, the fracture mode of nickel will change from ductile rupture to intergranular. Experiments performed to evaluate the role of dislocation transport of hydrogen in the embrittlement of nickel suggest that dislocation transport has no effect on embrittlement and that the embrittlement mechanism is not dependent on hydrogen mobility.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 6323865
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
DISLOCATIONS
ELEMENTS
EMBRITTLEMENT
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HYDROGEN
HYDROGEN EMBRITTLEMENT
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NICKEL
NONMETALS
SEGREGATION
TRANSITION ELEMENTS