Fatigue behavior of additive manufactured 316L stainless steel under axial versus rotating-bending loading: Synergistic effects of stress gradient, surface roughness, and volumetric defects

Shrestha, Rakish; Simsiriwong, Jutima; Shamsaei, Nima

doi:10.1016/j.ijfatigue.2020.106063

Cited by 40 publications

(21 citation statements)

References 29 publications

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“…Figure 6 also contains information on fatigue crack initiation sites. For the rotating bending fatigue tests, surface crack initiation dominates fatigue failures for all specimens before 10 6 cycles, i.e., LCF and HCF regimes; this is mainly due to the influence of the stress gradient [ 34 , 35 ] and the size effect of smaller control volumes [ 33 , 36 ] in rotating bending. For the ultrasonic fatigue tests, surface crack initiation still govern fatigue failure for all specimens before 5 × 10 6 cycles, i.e., HCF regimes.…”

Section: Resultsmentioning

confidence: 99%

The Fatigue Behaviors of a Medium-Carbon Pearlitic Wheel-Steel with Elongated Sulfides in High-Cycle and Very-High-Cycle Regimes

Liu

et al. 2021

Materials

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The effects of stress ratio (R), loading condition, and MnS inclusion on the fatigue behavior of a medium-carbon pearlitic wheel-steel were investigated by a combination of rotating (frequency of 52.5 Hz, 103–108) bending and ultrasonic (frequency of 20 kHz, 5 × 104–109) axial cycling tests in high-cycle and very-high-cycle regimes. All the S-N curves present horizontal asymptotic shapes and have clear fatigue limits. The fatigue limits (260–270 MPa) for R = −1 obtained by ultrasonic test are almost 140–150 MPa lower than that (400–410 MPa) obtained by rotating bending, and the limit values of R = 0.3 are almost in the range of 195–205 MPa. For rotating bending, the fatigue fractures were originated from the surface matrix of the specimen. Whereas for ultrasonic fatigue, both surface and interior crack initiation occurred, and cracks were all initiated from MnS inclusions regardless of stress ratios. The finite element method was employed to study the influence of MnS inclusions on crack initiation and propagation. The results show that high stress concentrates on the sides of the elliptical MnS inclusion rather than the tip of the inclusion.

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Section: Resultsmentioning

confidence: 99%

The Fatigue Behaviors of a Medium-Carbon Pearlitic Wheel-Steel with Elongated Sulfides in High-Cycle and Very-High-Cycle Regimes

Liu

et al. 2021

Materials

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“…It encouraged the statistical approach. Effects of microstructure, defects, and loading on the fatigue response and limits were investigated on various materials 19–21 . It is now established that for ductile alloys such as nickel‐based alloys, the fatigue limit (stress below which no crack can initiate independently to the number of cycles) does not exist 22 .…”

Section: Introductionmentioning

confidence: 99%

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

Martin

Hor

Copin

et al. 2022

Fatigue Fract Eng Mat Struct

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Laser‐based powder bed fusion (LPBF) is attractive to build complex parts in spite of the low machinability of Inconel 625. The LPBF microstructures and tensile properties are well documented in literature. But fatigue properties and impact of the LPBF intrinsic defects and microstructures on the crack initiation and propagation mechanisms are uncommon. Low and high‐cycle fatigue tests at room and service temperature presented in this paper prove that the LPBF defects shorten the crack initiation stage. After annealing heat treatment, the microstructure adapts to the defects, and the fatigue response becomes similar to a free defect material. The fatigue life of as‐built Inconel 625 is lower than 50% of its monotonic yield tensile strength (YTS) while the annealed material reaches 100% of its YTS. The propagation rate is slowed by the homogeneous annealed microstructure and improved ductility resulting from removal of dislocation cells and changes in grain morphology.

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“…The purpose of this paper is to review the IT‐RBF microstructural and empirical S‐N data behavior of AM'd metals; however, some fundamentals of the stress gradient effect will also be examined. As depicted in Figure 4 in this response letter, the normal stress owing to axial loading is distributed uniformly across the cross‐sectional area of the gage; in contrast, the stress gradient is present in the RBF specimen starting from a maximum at the surface to zero in the neutral axis 17,55 …”

Section: Rbf Of Am'd Materialsmentioning

confidence: 99%

A review on isothermal rotating bending fatigue failure: Microstructural and lifetime modeling of wrought and additive manufactured alloys

Behvar

Berto

Haghshenas

2023

Fatigue Fract Eng Mat Struct

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The cumulative effect of many incidents that are brought about by an increase in temperature establishes an environment in which premature failure (including fatigue failure) becomes a challenging issue. Isothermal rotating bending fatigue (IT‐RBF) testing may simulate industrial components' high temperatures and rotating environments. This state‐of‐the‐art review paper covers the current research on IT‐RBF failure in wrought and additive‐manufactured alloys, focusing on microstructural and lifetime models. The article emphasizes the need of using microstructural information in fatigue life models to better represent complex material structure‐failure behavior associations. Additive‐manufactured alloys contain unique microstructural characteristics and processing‐induced defects making fatigue modeling difficult. The paper concludes with implications for industrial fatigue‐resistant alloy development. It emphasizes the necessity for a multidisciplinary approach that integrates materials science, mechanics, and data science to optimize these materials under cyclic loads. The review concludes by proposing future research and innovation in this subject.

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Fatigue behavior of additive manufactured 316L stainless steel under axial versus rotating-bending loading: Synergistic effects of stress gradient, surface roughness, and volumetric defects

Cited by 40 publications

References 29 publications

The Fatigue Behaviors of a Medium-Carbon Pearlitic Wheel-Steel with Elongated Sulfides in High-Cycle and Very-High-Cycle Regimes

The Fatigue Behaviors of a Medium-Carbon Pearlitic Wheel-Steel with Elongated Sulfides in High-Cycle and Very-High-Cycle Regimes

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

A review on isothermal rotating bending fatigue failure: Microstructural and lifetime modeling of wrought and additive manufactured alloys

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