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

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7230960

Raske, D T; Cheng, C F

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.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7230960
• Report Number(s): CONF-7609106-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACKS
FATIGUE
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
MATHEMATICS
MECHANICAL PROPERTIES
NICKEL ALLOYS
STAINLESS STEEL-304
STAINLESS STEEL-308
STAINLESS STEELS
STATISTICS
STEELS