A multi-scale experimental investigation for fatigue limit and fatigue crack initiation behavior of powder bed fusion-laser beam 316L stainless steel

Zhang, Wen; Moumni, Ziad; Zhu, Jihong; Zhang, Yahui; Li, Shaoying; Zhang, Weihong

doi:10.1016/j.msea.2023.144692

Cited by 8 publications

(2 citation statements)

References 52 publications

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“…The ferrite grain size of H-HAZ was refined in the weld joints under the addition of N 2 in the shielding gas compared with Ar shielding gas. Under fatigue load, the coarse grains were more likely to initiate fatigue cracks, thereby reducing the fatigue life of weld joints [ 39 , 40 , 41 , 42 ].…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Yang,

Zheng,

Wang

et al. 2023

Materials

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To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A good thin-walled pipe butt joint was formed using the pulsed tungsten inert gas (P-TIG) welding method with Ar-N2 shielding gas. High cycle fatigue tests of the weld joints were conducted to study the effect of shielding gas nitriding on the fatigue properties. Fatigue tests at three stress levels of 225 MPa, 270 MPa, and 360 MPa were carried out on the weld joints with different N2 contents, and the fatigue samples were all fractured in the high temperature heat-affected zone (H-HAZ). Within the current process parameters, the fatigue life of the 4 vol.% N2 welded joints was optimal. Fatigue striations appeared in the fatigue crack propagation zone, and the transient fracture zone was similar to the tensile fracture. Under the low-stress level, the area of the crack propagation zone under 4 vol.% N2 was the highest, the tear ridges all expanded around the crack source area, and the fatigue crack propagation zone presented a radial distribution. The proliferation and expansion of dislocations were mainly carried out in the austenite grains, and the dislocation density of the fatigue specimens under 4 vol.% N2 was smaller than that of the Ar specimens. Shielding gas nitriding effectively improved the balance of the two-phase ratio and the hardness of austenite phase, optimized the internal slip system, inhibited the proliferation of dislocations in the austenite phase, and improved the fatigue life of weld joints.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Yang,

Zheng,

Wang

et al. 2023

Materials

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“…These standards do not include minimum requirements in fatigue, although it was previously suggested that the main factor for failure of medical implants is the initiation and propagation of cracks due to cyclic loading ( Bowers et al, 2022 ), referred to as fatigue damage. In addition, non-homogeneous porosity and rough surfaces due to partial melting of some particles were also more recently reported as affecting fatigue life (i.e., the number of cycles or repetitions N of a given stress level that a design can endure before it fails) by creating notches with stress concentration, which increases the risk of fatigue damage ( Bordin et al, 2017 ; Almansoori et al, 2020 ; Zhu et al, 2023 ). Over the past decades, the additively manufactured Ti-6Al-4V alloy has been extensively studied due to its popularity in the manufacturing industry.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and numerical fatigue life prediction of 3D-Printed osteosynthesis plates

Nakhaei¹,

Sterba²,

Foletti

et al. 2023

Front. Bioeng. Biotechnol.

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The trend towards patient-specific medical orthopedic prostheses has led to an increased use of 3D-printed surgical implants made of Ti6Al4V. However, uncertainties arise due to varying printing parameters, particularly with regards to the fatigue limit. This necessitates time-consuming and costly experimental validation before they can be safely used on patients. To address this issue, this study aimed to employ a stress-life fatigue analysis approach coupled with a finite element (FE) simulation to estimate numerically the fatigue limit and location of failure for 3D-printed surgical osteosynthesis plates and to validate the results experimentally. However, predicting the fatigue life of 3D components is not a new concept and has previously been implemented in the medical device field, though without experimental validation. Then, an experimental fatigue test was conducted using a proposed modification to the staircase method introduced in ISO 12107. Additionally, a FE model was developed to estimate the stress cycles on the plate. The stress versus number of cycles to failure curve (S-N) obtained from the minimum mechanical properties of 3D-printed Ti6AI4V alloy according to ASTM F3001-14 to predict the fatigue limit. The comparison between experimental results and fatigue numerical predictions showed very good agreement. It was found that a linear elastic FE model was sufficient to estimate the fatigue limit, while an elastic-plastic model led to an accurate prediction throughout the implant’s cyclic life. The proposed method has great potential for enhancing patient-specific implant designs without the need for time-consuming and costly experimental regulatory testing.

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Analysis of Fatigue Properties of Selective Laser Melting 316L Stainless Workpiece After Post-heat Treatment

Zhao,

Yang,

et al. 2024

J. of Materi Eng and Perform

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A multi-scale experimental investigation for fatigue limit and fatigue crack initiation behavior of powder bed fusion-laser beam 316L stainless steel

Cited by 8 publications

References 52 publications

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Experimental analysis and numerical fatigue life prediction of 3D-Printed osteosynthesis plates

Analysis of Fatigue Properties of Selective Laser Melting 316L Stainless Workpiece After Post-heat Treatment

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