scholarly journals Role of mean stress on fatigue behavior of a 316L austenitic stainless steel in LWR and air environments

2021 ◽  
Vol 145 ◽  
pp. 106111
Author(s):  
W. Chen ◽  
P. Spätig ◽  
H.P. Seifert
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Fatigue Behavior ◽  
Mean Stress ◽  
316L Austenitic Stainless Steel

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

2018 ◽  
Vol 165 ◽  
pp. 03012 ◽  
Author(s):  
Wen Chen ◽  
Philippe Spätig ◽  
Hans-Peter Seifert
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Cyclic Hardening ◽  
Fatigue Tests ◽  
Mean Stress ◽  
Test Results ◽  
316L Austenitic Stainless Steel

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.

Controlled generation of ferromagnetic martensite from paramagnetic austenite in AISI 316L austenitic stainless steel

2009 ◽  
Vol 24 (2) ◽  
pp. 565-573 ◽  
Author(s):  
E. Menéndez ◽  
J. Sort ◽  
M.O. Liedke ◽  
J. Fassbender ◽  
S. Suriñach ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Ball Milling ◽  
Aisi 316L ◽  
Dynamic Approach ◽  
Size Refinement ◽  
316L Austenitic Stainless Steel ◽  
Static Approach

The strain-induced austenite (γ) to martensite (α′) transformation in AISI 316L austenitic stainless steel, either in powders or bulk specimens, has been investigated. The phase transformation is accomplished using either ball-milling processes (in powders)—dynamic approach—or by uniaxial compression procedures (in bulk specimens)—quasi-static approach. Remarkably, an increase in the loading rate causes opposite effects in each case: (i) it increases the amount of transformed α′ in ball-milling procedures, but (ii) it decreases the amount of α′ in pressed samples. Both the microstructural changes (e.g., crystallite size refinement, microstrains, or type of stacking faults) in the parent γ phase and the role of the concomitant temperature rise during deformation seem to be responsible for these opposite trends. Furthermore, the results show the correlation between the γ → α′ phase transformation and the development of magnetism and enhanced hardness.

Sign in / Sign up

Export Citation Format

Share Document