Thermal fatigue of stainless steel

Technical Report · Tue Dec 01 04:00:00 EST 1987

DOI:https://doi.org/10.2172/5749580· OSTI ID:5749580

Jones, W B; Bourcier, R J; Van Den Avyle, J A

Two austenitic steels, 316 Stainless Steel and Alloy 800, have been examined under conditions of both isothermal low cycle fatigue (LCF) and thermomechanical fatigue (TMF). The TMF tests were conducted between 649 and 360/sup 0/C with a carefully controlled triangular waveform. The LCF tests were performed at 649/sup 0/C and both kinds of tests were subjected to a strain range of 0.5%. TMF shortened life to 40% for 316 Stainless Steel and to 5% for Alloy 800. The microstructural evolution occurring in both alloys has been examined and we conclude these do not play a role in the life shortening caused by TMF. The TMF does produce asymmetric hysteresis loops with large tensile peak stresses in tests where the maximum temperature corresponded with the peak compressive stress. The influence of TMF on fatigue crack growth rates has been measured and it was found that TMF accelerated crack growth in Alloy 800 and slowed it down slightly in 316 Stainless Steel. The dominant influence of TMF appears to be in fatigue crack initiation, with the tensile peak stress development driving early crack initiation. 31 refs., 11 figs., 4 tabs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5749580
• Report Number(s): SAND87-0696; ON: DE88004146
• Country of Publication: United States
• Language: English

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CRYSTAL STRUCTURE
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DATA
EXPERIMENTAL DATA
FATIGUE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
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