Grain-boundary chemistry, fracture mode and ductility comparison for iron and nickel tested at cathodic potentials
The fracture mode of iron and nickel tested at equal cathodic current densities was found to be a function of the grain boundary sulfur concentration with iron and nickel having transitions at 0.12 and 0.09 monolayers of sulfur, respectively. The reduction of area of iron and nickel tested at equal cathodic current densities also decreased similarly with increasing grain boundary sulfur concentrations. The similarity in the effect of hydrogen and sulfur on iron and nickel can be explained by their role in intergranular decohesion. However, the different hydrogen transport rates in these materials suggests a rate controlling HAR which is altered similarly by sulfur in iron and nickel. This process requires that hydrogen transport by either dislocations or bulk diffusion is sufficiently fast that permeation is surface controlled.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5510271
- Report Number(s):
- PNL-SA-8481; CONF-800850-7; ON: DE82008604
- Resource Relation:
- Conference: International conference on effects of hydrogen on materials, Jackson Lake Lodge, WY, USA, 26 Aug 1980
- Country of Publication:
- United States
- Language:
- English
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