Fatigue life assessment in the very high cycle regime of AISI 316L stainless steel processed by L-DED additive manufacturing

Andrade, M.F.; Pereira, M. V.; Teixeira, M.C.; Júnior, Alberto Trapani; Gutjar, J.

doi:10.1016/j.prostr.2022.12.127

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…The reason for this can be attributed to two aspects: at high stress range, the material was prone to plastic deformation, and the residual compressive stress caused by ultrasonic impact was released rapidly, leading to rapid crack sprouting in the modified 316L specimens; at low stress range, the residual compressive stress and high finish of the modified 316L surface can greatly inhibit crack initiation and extension, thus significantly improving the fatigue life [ 24 ].The fatigue strength to tensile strength ratios for 316L and modified 316L specimens were 0.45 and 0.46, respectively. Andrade et al [ 27 ] and Hitoshi et al [ 31 ] found that UIT can increase the fatigue strength of metallic materials by between 20% and 30%, and in a few cases, the fatigue limit can be increased by 50%, which was agreement with the results in this study. Fig 14 shows the relationship between the stress range and the difference in diameter after fracture (ΔΦ) of the specimens.…”

Section: Resultssupporting

confidence: 92%

“…Mordyuk et al [ 26 ] used a combination of UIT and EDM surface alloying of mild steel 20GL and found that the fatigue strength was increased by 15~ 30%. Andrade et al [ 27 ] utilized L-DED additive manufacturing of 316L stainless steel, which showed a 35% increase in fatigue strength. Yan et al [ 28 ] found that ultrasonically rolled can increase the endurance limit of the material by more than 50%.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Zhu,

Zhuang,

et al. 2024

PLoS ONE

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In the present study, effect of ultrasonic impact treatment (UIT) on the microstructural characterization and mechanical properties of 316L stainless steel (hereinafter referred to as 316L) was investigated experimentally. The fatigue fracture mechanism of 316L before and after UIT was revealed. The experimental results indicated that the martensitic grain size induced at the impact edge was about 2.00 Å. The surface modified 316L formed a gradient nanostructure and induced a martensitic phase transformation. The hardness of the surface layer of the modified 316L was twice the hardness of its matrix. The tensile strengths of 316L before and after UIT were 576 MPa and 703 MPa, respectively. The stretching stripes of 316L were more disordered after UIT. The fatigue strengths of 316L before and after UIT were 267 MPa and 327 MPa, respectively. The fatigue cracking of 316L started from the austenite grain boundaries. The fatigue fracture surface was relatively rough. The fatigue crack sources of the modified 316L came from internal inclusions. The inclusions were oxides dominated by SiO2. As the stress range increased, the crack initiation site migrated to the interior and the fatigue fracture surface became flatter.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Zhu,

Zhuang,

et al. 2024

PLoS ONE

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“…The metallic powder used for the manufacture of all specimens was a gas atomized 316L stainless steel powder (code 316L-5520), made by Höganäs company. The powder particles are predominantly spherical, with a granulometric distribution of 53-150 µm 24,25 . The process parameters used in the manufacturing procedure were defined by prior empirical knowledge of the equipment and processing of this alloy 22 .…”

Section: Methodsmentioning

confidence: 99%

Experimental Study of VHCF Fractographic Features of Conventionally and Additively Manufactured Steels

2023

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Materials produced by additive manufacturing (AM) have been extremely related to literature. However, there is still unconsolidated knowledge about the fatigue life and respective mechanisms of initiation of cracks predominant in the VHCF regime for these materials. What has been observed in materials produced by conventional routes is that fatigue cracks tend to nucleate from intrinsic defects of the material located internally or in subsurface regions. The change in the evolution process of fatigue cracks leads to the formation of a characteristic morphology on the fracture surface, known as "fish-eye". Another widespread aspect observed on the fracture surfaces is the formation of a fine granular area (FGA) nearby the initiation sites. This work aims to investigate the mechanisms of crack nucleation in VHCF of two distinct materials: conventional steel, DIN 34CrNiMo6 and AISI 316L stainless steel produced by L-DED. The ultrasonic tests were carried out at a frequency of 20±0,5 kHz and R= -1. The S-N curves were obtained and fracture surfaces were analyzed, fish-eye and FGA formation was verified. FGA sizes were compared to values estimated by empirical equations. FGA and fish-eye sizes were related to stress amplitude and maximum stress intensity factor (SIF).

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High and very high cycle fatigue behavior of an additive manufactured hot-work tool steel

Chantziara,

Nikas,

Bergström

et al. 2024

Materials Science and Engineering: A

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Fatigue life assessment in the very high cycle regime of AISI 316L stainless steel processed by L-DED additive manufacturing

Cited by 3 publications

References 13 publications

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Experimental Study of VHCF Fractographic Features of Conventionally and Additively Manufactured Steels

High and very high cycle fatigue behavior of an additive manufactured hot-work tool steel

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