Mechanism of Corrosion Fatigue of Steel and Titanium Alloys.
Abstract
The kinetics of subcritical-crack growth under sustained load in 3.5 pct NaCl solution have been determined over a range of temperatures from 3 to 90 C. 0.64 cm (1/4 in.) thick wedge-opening-load (WOL) specimens were used. A well defined K-independent stage (Stage II) of growth was observed at each temperature, and the rate was controlled by a thermally activated process having an apparent activation energy of 20 plus or minus 5 kJ/mol (on a 95 pct confidence level basis). These Stage II rates were substantially higher than those reported by Williams and Nelson, at corresponding temperatures, for this alloy tested in hydrogen at 0.9 atm. The apparent activation energy for crack growth in these two environments, however, are statistically equivalent. No identification of the rate controlling process (or processes) has been made.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 03, 1978
- Accession Number
- ADA057313
Entities
People
- G. W. Simmons
- Robert P. Wei
Organizations
- Lehigh University