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Fatigue crack propagation in Types 304 and 308 stainless steel at elevated temperatures

Description: The fatigue crack-growth resistance of Type 304 stainless steel base metal and Type 308 stainless steel weld metal at 593/sup 0/C (1100/sup 0/F) was investigated. Specimens of both materials in the as-received (or as-welded) and thermally aged conditions were tested. The crack-growth rates were found to be exponentially related to the stress-intensity factor range, ..delta..K. This relation, determined by regression analysis, was statistically appropriate and generally provided a good fit to the data. Confidence levels for new crack-growth rate observations were estimated, and comparisons of mean crack-growth rates were made. The results of the present investigation suggest the following conclusions: The fatigue crack-growth rates at 593/sup 0/C (1100/sup 0/F) in the Type 308 stainless steel metal are statistically lower than in the Type 304 stainless steel base metal in both the aged and as-welded (or as-received) conditions. Thermal aging at 593/sup 0/C for 1000 h results in lower fatigue crack-growth rates in the base and weld metal tested at 593/sup 0/C. Moreover, this difference in crack-growth rate was found to be greater than previously reported for lower-temperature tests. Load changes and hold periods at each crack-growth increment increase the scatter in results by a factor of approximately three.
Date: January 1, 1976
Creator: Raske, D. T. & Cheng, C. F.
Partner: UNT Libraries Government Documents Department

1993 Site environmental report Sandia National Laboratories, Albuquerque, New Mexico

Description: This 1993 report contains monitoring data from routine radiological and nonradiological environmental surveillance activities. Summaries of significant environmental compliance programs in progress, such as National Environmental Policy Act documentation, environmental permits, environmental restoration, and various waste management programs for Sandia National Laboratories in Albuquerque, New Mexico, are included. The maximum offsite dose impact was calculated to be 0.0016 millirem. The total population within a 50-mile (80 kilometer) radius of Sandia National Laboratories/New Mexico received an estimated collective dose of 0.027 person-rem during 1993 from the laboratories operations, As in the previous year, the 1993 operations at Sandia National Laboratories/New Mexico had no discernible impact on the general public or on the environment. This report is prepared for the U.S. Department of Energy in compliance with DOE Order 5400.1.
Date: November 1, 1994
Creator: Culp, T. A.; Cheng, C. F.; Cox, W.; Durand, N.; Irwin, M.; Jones, A. et al.
Partner: UNT Libraries Government Documents Department