Fatigue behavior of 316L austenitic stainless steel in air and LWR environment with and without mean stress

Author:

Chen Wen,Spätig Philippe,Seifert Hans-Peter

Abstract

The fatigue life design curves in nuclear codes are generally derived from uniaxial straincontrolled fatigue test results. Evidently, the test conditions are very different from the actual components loading context, which involves much more complex thermo-mechanical loading including mean stress, static load holding time and variation in water chemistry, etc. In this work, the mean stress and environmental effects on fatigue life of 316L austenitic stainless steel in air and light water reactor (LWR) environment were studied using hollow fatigue specimens and testing under load-controlled condition. Both positive (+50 MPa) and negative (-20 MPa) mean stresses showed beneficial effect on fatigue life in LWR environment and in air. This is tentatively attributed to mean stress enhanced cyclic hardening, which leads to smaller strain response at the same loading force. -20 MPa mean stress was found to increase fatigue limit, whereas the effect of +50 MPa mean stress on fatigue limit is still unclear. The preliminary results illustrate that the environmental reduction of fatigue life is amplified in load-controlled fatigue tests with tensile mean stress.

Publisher

EDP Sciences

Subject

General Medicine

Reference21 articles.

1. Dahlberg D. B. Magnus, “Fatigue margins for austenitic stainless steels in ASME boiler and pressure vessel code-a literature study,” (Swedish Radiation Safety Authority, Sweden, 2012).

2. Development of an Environmental Fatigue Evaluation Method for Nuclear Power Plants in JSME Code

3. Spätig P., Seifert H. P., 17th Int. Conference on Environmental Degradation of Materials in Nuclear Systems - Water Reactors (TMS, Ottawa, 2015).

4. Corrosion fatigue crack growth behaviour of austenitic stainless steels under light water reactor conditions

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