Grain-boundary chemistry, fracture mode and ductility comparison for iron and nickel tested at cathodic potentials

Conference · Fri Aug 01 04:00:00 EDT 1980

OSTI ID:5510271

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

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
FRACTURE PROPERTIES
GRAIN BOUNDARIES
IRON
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NICKEL
TENSILE PROPERTIES
TRANSITION ELEMENTS