Effect of High Porosity on Bending Fatigue Properties of 3D Printed AISI 316L Steel

Jaskari, Matias; Mäkikangas, Jarmo; Järvenpää, Antti; Mäntyjärvi, Kari; Karjalainen, L.P.

doi:10.1016/j.promfg.2019.08.006

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…This setup showed promising results for the production of larger samples with a reduced level of internal residual stresses [46]. Altogether, with an enhanced level of fatigue resistance [47] of AISI 316L prepared by SLM, this setup it makes this process suitable for large medical and implantology equipment.…”

Section: Discussionmentioning

confidence: 85%

Complex Corrosion Properties of AISI 316L Steel Prepared by 3D Printing Technology for Possible Implant Applications

et al. 2020

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This paper deals with the investigation of complex corrosion properties of 3D printed AISI 316L steel and the influence of additional heat treatment on the resulting corrosion and mechanical parameters. There was an isotonic solution used for the simulation of the human body and a diluted sulfuric acid solution for the study of intergranular corrosion damage of the tested samples. There were significant microstructural changes found for each type of heat treatment at 650 and 1050 °C, which resulted in different corrosion properties of the tested samples. There were changes of corrosion potential, corrosion rate and polarization resistance found by the potentiodynamic polarization method. With regard to these results, the most appropriate heat treatment can be applied to applications with intended use in medicine.

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Section: Discussionmentioning

confidence: 85%

Complex Corrosion Properties of AISI 316L Steel Prepared by 3D Printing Technology for Possible Implant Applications

et al. 2020

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“…This has been enabled by some of the key benefits that the technique provides: the ability to design complex parts without additional cost, reduction in weight and the low cost of manufacturing unique products. From a material perspective, austenitic stainless steel 316L is one of the most prominent materials currently utilized in the AM sector and the microstructure of the laser powder bed fusion (LPBF) manufactured 316L has been widely studied [ 4 , 5 ]. The results have showed that the mechanical properties of the LPBF manufactured material in terms of the strength exceed the properties of traditionally manufactured peers [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…In bending fatigue, the effect of surface and near surface properties are promoted, as the maximum strains concentrate on the surface. A brief study about the fatigue behavior in bending fatigue of additively manufactured AISI 316L was published by Jaskari et al [ 5 ], and they found out that the porosity in or near the surface dictated the fatigue behavior, regardless of the microstructure or achieved mechanical properties and presented a fatigue limit of 289 MPa at 2 million with R = −1 when higher energy density was used. In addition, the high cycle fatigue properties of the LPBF manufactured 316L in axial loading have been studied previously showing that an endurance limit of 568 MPa can be reached in the absence of critical defect using 10 6 cycles and R = 0.1 [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel

et al. 2022

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Severe shot peening (SSP) was used on additive manufactured 316L by laser powder bed fusion. The effect of the post processing on the surface features of the material was analyzed through residual stress measurements, tensile testing, hardness-depth profiles, and fatigue testing by flexural bending. The results showed that SSP can be utilized to form residual stresses up to −400 MPa 200 μm below the surface. At the same time, a clear improvement on the surface hardness was achieved from 275 HV to near 650 HV. These together resulted in a clear improvement on material strength which was recorded at 10% improvement in ultimate tensile strength. Most significantly, the fatigue limit of the material was tripled from 200 MPa to over 600 MPa and the overall fatigue strength raised similarly from a low to high cycle regime.

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“…Based on the obtained porosity results, an increased number of voids in samples manufactured using lower energy density could be observed. Indeed, a value of porosity lower than 1% is acceptable [ 26 , 27 ], but, as could be observed in Figure 1 , using more complex thin-walled structures could affect porosity growth. Additionally, in the attached images in Table 2 , the highest number of pores is visible in the middle of the thin-walled part of the sample, which could be affected by the varied thermal history of that volume of material in comparison to the monolithic part of the material.…”

Section: Resultsmentioning

confidence: 99%

“…SLM-processed parts are full-metallic parts which could be subjected to different surface treatments available for metals. The most efficient surface treatments are methods using the kinetic energy of accelerated small parts (e.g., metal shooting or sanding) or different types of chemical and electrochemical polishing [ 26 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Modification of Structural Properties Using Process Parameters and Surface Treatment of Monolithic and Thin-Walled Parts Obtained by Selective Laser Melting

et al. 2020

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Additive manufacturing is one of the most popular technological processes and is being considered in many research works, a lot of which are related to thin-walled parts analysis. There are many cases where different part geometries were manufactured using the same process parameters. That kind of approach often causes different porosity and surface roughness values in the geometry of each produced part. In this work, the porosity of thin-walled and monolithic parts was compared. To analyze additively manufactured samples, porosity and microstructural analyses were done. Additionally, to check the influence of process parameter modification on the manufactured parts’ properties, hardness and roughness measurements were made. Surface roughness and the influence of surface treatment were also taken into account. Porosity reduction of thin-walled parts with energy density growth was observed. Additionally, a positive influence of slight energy density growth on the surface roughness of produced parts was registered. Comparing two extreme-parameter groups, it was observed that a 56% energy density increase caused an almost 85% decrease in porosity and a 45% increase in surface roughness. Additional surface treatment of the material allowed for a 70–90% roughness reduction.

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Effect of High Porosity on Bending Fatigue Properties of 3D Printed AISI 316L Steel

Cited by 19 publications

References 15 publications

Complex Corrosion Properties of AISI 316L Steel Prepared by 3D Printing Technology for Possible Implant Applications

Complex Corrosion Properties of AISI 316L Steel Prepared by 3D Printing Technology for Possible Implant Applications

The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel

Modification of Structural Properties Using Process Parameters and Surface Treatment of Monolithic and Thin-Walled Parts Obtained by Selective Laser Melting

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