EFFECT OF LASER SURFACE TREATMENT ON HIGH CYCLE FATIGUE OF AISI 316L STAINLESS STEEL

AISI 316L stainless steels are widely employed in applications where durability is crucial. For this reason, an accurate prediction of its behaviour is of paramount importance. In this work, the spotlight is on the cyclic response and low-cycle fatigue performance of this material, at room temperature. Particularly, the first aim of this work is to experimentally test this material and use the results as input to calibrate the parameters involved in a kinematic and isotropic nonlinear plasticity model (Chaboche and Voce). This procedure is conducted through a newly developed calibration procedure to minimise the parameter estimates errors. Experimental data are eventually used also to estimate the strain–life curve, namely the Manson–Coffin curve representing the 50% failure probability and, afterwards, the design strain–life curves (at 5% failure probability) obtained by four statistical methods (i.e., deterministic, “Equivalent Prediction Interval”, univariate tolerance interval, Owen’s tolerance interval for regression). Besides the characterisation of the AISI 316L stainless steel, the statistical methodology presented in this work appears to be an efficient tool for engineers dealing with durability problems as it allows one to select fatigue strength curves at various failure probabilities depending on the sought safety level.

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Study of boriding surface treatment in the tribological behavior of an AISI 316L stainless steel

Wear ◽

10.1016/j.wear.2021.203825 ◽

2021 ◽

pp. 203825

Author(s):

L.A. Arteaga-Hernandez ◽

C.A. Cuao-Moreu ◽

C.E. Gonzalez-Rivera ◽

M. Alvarez-Vera ◽

J.A. Ortega-Saenz ◽

...

Keyword(s):

Stainless Steel ◽

Surface Treatment ◽

316L Stainless Steel ◽

Tribological Behavior ◽

Aisi 316L ◽

Aisi 316L Stainless Steel

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Effect of Static Pre-Strain on Low Cycle Fatigue Life of AISI 316L Stainless Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.462-463.65 ◽

2011 ◽

Vol 462-463 ◽

pp. 65-69

Author(s):

Tomohiro Ido ◽

Jun Komotori

Keyword(s):

Stainless Steel ◽

Fatigue Life ◽

316L Stainless Steel ◽

Early Stage ◽

Low Cycle Fatigue ◽

Cyclic Strain ◽

Aisi 316L ◽

Cycle Fatigue ◽

Aisi 316L Stainless Steel ◽

Work Softening

In order to clarify the effects of a great amount of static pre-strain (1/4 cycle) on fatigue life of AISI 316L stainless steel, strain controlled low cycle fatigue tests were carried out. Hardness and fracture ductility of specimens were measured. Results showed that in the case of a specimen with p=0.01, static pre-strain of 0.16 noticeably reduced a fatigue life. To clarify the reasons for the decrease in fatigue life with pre-strain, the maximum stress amplitude of the hysteresis loop was measured. In the case of the specimen with p=0.01, work softening was observed in the early stage of fatigue life. On the other hand, when the cyclic plastic strain ranges were p=0.10, no softening was observed. These results suggest that work softening is significant in determining the fatigue life of the specimens at a relatively low level of applied cyclic strain.

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