Observations on the influence of process and corrosion related defects on the fatigue strength of 316L stainless steel manufactured by Laser Powder Bed Fusion (L-PBF)

Merot, Pierre; Morel, Franck; Mayorga, Linamaría Gallegos; Pessard, Etienne; Buttin, Paul; Baffie, T.

doi:10.1016/j.ijfatigue.2021.106552

Cited by 14 publications

(13 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LPBF process is known to cause many defects such as LoF or gas pores in the as-printed specimens. 7,34,36,41,50 In order to determine the proportion of defects in the microstructure, density measurements were carried out using Archimedes' method and X-ray tomography, and the results are shown in Table 3.…”

Section: Defect Analysismentioning

confidence: 99%

“…[28][29][30][31] The control of the microstructure allowed by the laser-scan strategy provides an interesting way to study the microstructural influence on fatigue. Numerous studies have reported the influence of energetic parameters on defect occurrence, 22,[32][33][34][35] and have investigated the impact of LPBF defects on fatigue behavior [36][37][38][39][40][41] ; however only few studies have investigated the microstructure-defect interplay using the laser-scan strategy as the controlling parameter. This new approach is full of interest because it allows to study the impact of specific microstructural characteristics such as grain shape and organization on the microstructure-defect interaction, which is not possible by varying the energetic parameters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Roirand

Hor

Malard

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The particular roles of grain morphology and defects, controlled using laser‐scan strategies, on the mechanical properties and the fatigue behavior of 316L stainless steel are investigated. Microstructural characterization and X‐ray tomography analysis was performed to understand the genesis of polycrystalline microstructure and defects. Tensile and fatigue tests were performed to analyze the effect of defect population and microstructural properties on plasticity and damage mechanisms during monotonic and cyclic loading. The effect of the grain‐size and shape and type of defect was carefully investigated to evaluate the mechanisms driving the mechanical behavior under quasi‐static and fatigue loading. It is shown that the laser‐scan strategy determines the anisotropy in the plane perpendicular to the building direction. Moreover, contrary to the existing literature, for 316L obtained by AM, the grain size and shape does not affect the mechanical properties, and LoF defects drive the fatigue life, independent of the defect/grain size ratio.

show abstract

Section: Defect Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Roirand

Hor

Malard

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Fatigue failures of medical implants are both undesirable and well documented 1,2 . The decrease in fatigue strength of implant materials when exposed to corrosion conditions is equally well known 3,4 . There are, however, very few reports of in vitro simulations of the effect of body fluids on the fatigue characteristics of implants manufactured by AM or directed energy deposition (DED) techniques 5,6 .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The decrease in fatigue strength of implant materials when exposed to corrosion conditions is equally well known. 3,4 There are, however, very few reports of in vitro simulations of the effect of body fluids on the fatigue characteristics of implants manufactured by AM or directed energy deposition (DED) techniques. 5,6 Wegner et al 5 investigated laser powder bed fusion magnesium alloy implants in an in vitro environment, along with ultra-high molecular weight polyethylene (UHMWPE) and titanium implants.…”

Section: Introductionmentioning

confidence: 99%

Corrosion fatigue of Ti‐6Al‐4V coupons manufactured by directed energy deposition

Hattingh

Botha

Bernard

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Titanium is a versatile biocompatible metal that is desirable in additively manufactured medical implant devices. However, additively manufactured parts have particular microstructures, porosity, residual stress, and surface conditions which can have a strong impact on fatigue performance. Implants have an added complexity from the saline operating environment and the associated impact on the safe design life. Equally, direct energy deposition induces a complex thermal history which, if not carefully controlled, can significantly alter the mechanical/material properties of the component. This study investigates the decrease in fatigue life, in an in vitro body fluid simulation using Ringer's solution, observed in Ti-6Al-4V specimens extracted from coupons manufactured by directed energy deposition. An interrupted deposition strategy was employed to control build regularity, which appeared to influence certain mechanical properties, including corrosion fatigue life. An ≈50% decrease in fatigue life was observed in Ringer's solution at 6 Hz loading frequency, clearly important in designing implants.

show abstract

“…If there is some porous agglomeration or share of unmelted grains-there is a need to use the Murakami approach-that statement has been justified in the work by Liang et al [20] The authors found that multiple clustering defects act synergistically as one large defect, which easily initiates fatigue cracking. Another very important issue has been taken into account by Merot et al, [21] where the authors indicated that corrosion pits affect the fatigue strength of the material, and there is no specific influence of defect morphology (regardless of its type) on the crack initiation phenomenon. It is also very crucial to take into account geometrical features which certainly affect the notch sharpness, and degree of multiaxiality-such an approach has been tested by Wang et al [22] Based on a literature review related to the fatigue of AM materials, there are several visible factors that significantly affect the fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Process Parameters on the Low-Cycle Fatigue Properties of 316L Steel Parts Produced by Powder Bed Fusion

Kluczyński

Śnieżek

Grzelak

et al. 2022

Metall Mater Trans A

View full text Add to dashboard Cite

In this paper, the influence of the additive manufacturing (AM), powder bed fusion (PBF) process parameters on the low-cycle fatigue (LCF) properties of 316L steel samples is shown. Based on the previous research, five parameter groups were selected. To make this analysis broader, research results of AM parts have been compared to the conventionally made counterparts. Such an approach allowed analyzing the manner different parameters affect the tensile and LCF behavior. The preliminary tests indicated that AM specimens are characterized by 65 pct of the total LCF strength in comparison to the conventionally made material. Further LCF tests indicated differences in the dissipated energy of some samples, which was visible in the hysteresis loops generated during testing in the total strain amplitude range from 0.30 to 0.45 pct. Based on the Morrow approach, it was possible to register an increased share of the plastic component during the fracture process in the Additive Manufacturing (AM) parts in the LCF tests with the total strain amplitude above 0.45 pct. The final microscopical investigation of parts’ fractures surfaces indicated the influence of the layered structure, and internal imperfections (such as unmelted powder particles and lack of fusion) of the as-built AM parts on the cracking process, which caused an increased number of multiplanar cracks and generation of the complex fracture morphology characterized by the layered structure of AM parts and share of imperfections—mostly porosity caused by unmelted powder particles which potentially was a base of secondary stage cracks.

show abstract

Observations on the influence of process and corrosion related defects on the fatigue strength of 316L stainless steel manufactured by Laser Powder Bed Fusion (L-PBF)

Cited by 14 publications

References 51 publications

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Effect of laser‐scan strategy on microstructure and fatigue properties of 316L additively manufactured stainless steel

Corrosion fatigue of Ti‐6Al‐4V coupons manufactured by directed energy deposition

The Influence of Process Parameters on the Low-Cycle Fatigue Properties of 316L Steel Parts Produced by Powder Bed Fusion

Contact Info

Product

Resources

About