Plastic zone size and sample thickness effects on the intergranular subcritical crack growth of iron and nickel

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5309497

Jones, R H ^[1]

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1. Pacific Northwest Laboratory, Richland, WA (USA)

Intergranular subcritical crack growth rate measurements have been made on iron and nickel samples at cathodic potentials in 1N H{sub 2}SO{sub 4} at 25 C. Samples with thicknesses of 2.5 mm, 5 mm and 10 mm were tested. Grain boundary sulfur concentrations as measured by Auger Electron Spectroscopy were about 0.3 monolayers in both iron and nickel. Plastic zone sizes were determined by electron channeling pattern analysis and microhardness and were dependent on thickness. Subcritical intergranular crack growth measurements at cathodic potentials showed that iron and nickel have similar values of K{sub TH}, comparable crack growth rates and a similar decrease in K{sub TH} with increasing sample thickness. The similarities and differences in the subcritical crack growth behavior of iron and nickel are discussed in the context of various hydrogen embrittlement mechanisms.

• OSTI ID: 5309497
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AUGER ELECTRON SPECTROSCOPY
CRACK PROPAGATION
CRYSTAL STRUCTURE
DIMENSIONS
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
GRAIN BOUNDARIES
HARDNESS
HYDROGEN COMPOUNDS
HYDROGEN EMBRITTLEMENT
INORGANIC ACIDS
IRON
KINETICS
MECHANICAL PROPERTIES
METALS
MICROHARDNESS
MICROSTRUCTURE
NICKEL
NONMETALS
PLASTICITY
QUANTITY RATIO
REACTION KINETICS
SPECTROSCOPY
SULFUR
SULFURIC ACID
THICKNESS
TRANSITION ELEMENTS