Grain boundary segregation and environmentally-induced fracture of materials
Segregation of metalloid impurities such as S, P, and Sb to grain boundaries can induce hydrogen embrittlement (HE) and intergranular stress corrosion cracking (IGSCC) of materials. Hydrogen-induced intergranular subcritical crack growth is affected by metalloid segregation with a combined impurity-hydrogen effect which follows the embrittling trend for impurity segregation in the absence of hydrogen. In Fe, S is more effective than Sb which is more effective than P. A similar relationship has been demonstrated for Ni. The role of metalloid impurity segregation in IGSCC may differ significantly from HE such that an impurity which has a small effect in HE can have a large effect in IGSCC. Sulfur and P in Ni are examples where this role reversal is observed. 29 refs., 13 figs.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6042217
- Report Number(s):
- PNL-SA-13067; CONF-860340-4; ON: DE86010219
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CHEMICAL REACTIONS
CORROSION
CRACK PROPAGATION
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HYDROGEN EMBRITTLEMENT
IMPURITIES
INTERGRANULAR CORROSION
IRON
IRON ALLOYS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NICKEL
SEGREGATION
SPECTROSCOPY
STRESS CORROSION
TRANSITION ELEMENTS