Investigation of the anisotropic fatigue behavior of additively manufactured structures made of AISI 316L with short-time procedures PhyBaLLIT and PhyBaLCHT

Blinn, Bastian; Ley, Maximilian; Buschhorn, Nils; Teutsch, Roman; Beck, Tilmann

doi:10.1016/j.ijfatigue.2019.03.022

Cited by 47 publications

(55 citation statements)

References 26 publications

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“…In the investigations of PBF processes of Yadollahi et al [10] on 17-4-PH, Casati et al [3] on 316L, Buchbinder et al [11] on AlSi10Mg as well as Mower et al [8] on all these materials, a higher strength of specimens with layer plane orientation parallel to the loading direction (horizontal building direction) than of specimens with a layer orientation perpendicular to the loading axis (vertical building direction) was reported. This correlates to the results of Yu et al [4] on LMD 316L and Alcisto et al [12] on Direct Metal Deposited (DMD: DED) Ti6Al4V and is confirmed by the overview works of Lewandowski et al [6] and Shamsaei et al [13] as well as consistent to our own results on 316L [14][15][16]. Moreover, the authors of [4,6,8,13,17,18] demonstrated comparable and even higher tensile and 0.2% yield strength of AM materials in relation to conventionally manufactured specimens.…”

Section: Introductionsupporting

confidence: 91%

“…Besides the dependency on the building direction, the works of Günther et al [22] on SLM Ti6Al4V as well as Xue et al [23] on Laser Engineered Net Shaped (LENS: DED) 316L demonstrated a strong influence of microstructural defects on the fatigue behavior of AM materials, which correlates to the results given in [8,10,21], our own works on 316L [14][15][16] and the overview work of Fotovvati et al [24] on SLM Ti6Al4V. Furthermore, a generally lower fatigue strength of AM materials in comparison to conventionally manufactured materials is reported in literature, which is mainly caused by microstructural defects and resulting notch effects [8,10,15,17,22].…”

Section: Introductionsupporting

confidence: 82%

“…Furthermore, a generally lower fatigue strength of AM materials in comparison to conventionally manufactured materials is reported in literature, which is mainly caused by microstructural defects and resulting notch effects [8,10,15,17,22]. These defects are pores [8,10,[14][15][16]21] as well as nonmetallic inclusions [15,21].…”

Section: Introductionmentioning

confidence: 99%

“…Based on these results, the √ area concept was established, which allows the determination of the materials fatigue strength σ w by considering the critical defect. Furthermore, this concept enables the rating of the materials defect tolerance by using modified σ a /σ w -N f curves as shown in [14,16,28].…”

Section: Introductionmentioning

confidence: 99%

“…The limited scope of fatigue investigations on AM materials is mainly caused by the high material and time effort of fatigue testing. This effort can be reduced by using the short-time procedures load increase test (LIT), PhyBaL LIT and PhyBaL CHT , as shown in [14,16,[29][30][31][32]. The LIT enables a qualitative determination of the material's cyclic deformation behavior as well as an estimation of the lower limit of the high cycle fatigue (HCF)-regime [14][15][16]32] in a comparably short time.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Chemical Composition of the Used Powder on the Fatigue Behavior of Additively Manufactured Materials

Blinn

Krebs

Ley

et al. 2019

Metals

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To exploit the whole potential of Additive Manufacturing (AM), a sound knowledge about the mechanical and especially cyclic properties of AM materials as well as their dependency on the process parameters is indispensable. In the presented work, the influence of chemical composition of the used powder on the fatigue behavior of Selectively Laser Melted (SLM) and Laser Deposition Welded (LDW) specimens made of austenitic stainless steel AISI 316L was investigated. Therefore, in each manufacturing process two variations of chemical composition of the used powder were utilized. For qualitative characterization of the materials cyclic deformation behavior, load increase tests (LITs) were performed and further used for the physically based lifetime calculation method (PhyBaLLIT), enabling an efficient determination of stress (S)–number of cycles to failure (Nf) curves (S–Nf), which show excellent correlation to additionally performed constant amplitude tests (CATs). Moreover, instrumented cyclic indentation tests (PhyBaLCHT) were utilized to characterize the materials’ defect tolerance in a comparably short time. All material variants exhibit a high influence of microstructural defects on the fatigue properties. Consequently, for the SLM process a higher fatigue lifetime at lower stress amplitudes could be observed for the batch with a higher defect tolerance, resulting from a more pronounced deformation induced austenite–α’-martensite transformation. In correspondence to that, the batch of LDW material with an increased defect tolerance exhibit a higher fatigue strength. However, the differences in defect tolerance between the LDW batches is only slightly influenced by phase transformation and seems to be mainly governed by differences in hardening potential of the austenitic microstructure. Furthermore, a significantly higher fatigue strength could be observed for SLM material in relation to LDW specimens, because of a refined microstructure and smaller microstructural defects of SLM specimens.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the Chemical Composition of the Used Powder on the Fatigue Behavior of Additively Manufactured Materials

Blinn

Krebs

Ley

et al. 2019

Metals

Self Cite

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Improving the Defect Tolerance of PBF‐LB/M Processed 316L Steel by Increasing the Nitrogen Content

et al. 2022

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Nitrogen (N) in steels can improve their mechanical strength by solid solution strengthening. Processing N‐alloyed steels with additive manufacturing, here laser powder bed fusion (PBF‐LB), is challenging as the N‐solubility in the melt can be exceeded. This degassing of N counteracts its intended positive effects. Herein, the PBF‐LB processed 316L stainless steel with increased N‐content is investigated and compared to PBF‐LB 316L with conventional N‐content. The N is introduced into the steel by nitriding the powder and mixing it with the starting powder to achieve an N‐content of approximately 0.16 mass%. Thermodynamic calculations for maximum solubility to avoid N outgassing and pore formation under PBF‐LB conditions are performed beforehand. Based on the results, a higher defect tolerance under fatigue characterized by Murakami model can be achieved without negatively influencing the PBF‐LB processability of the 316L steel. The increased N‐content leads to higher hardness (+14%), yield strength (+16%), tensile strength (+9%), and higher failure stress in short time fatigue test (+16%).

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Influence of microstructural defects and the surface topography on the fatigue behavior of “additively‐subtractively” manufactured specimens made of AISI 316L

Blinn

Greco

Smaga

et al. 2021

Materialwissenschaft Werkst

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As additive manufacturing offers only low surface quality, a subsequent machining of functional and highly loaded areas is required. Thus, a sound knowledge of the interrelation between the additive and subtractive manufacturing process as well as the resulting mechanical properties is indispensable. In this work, specimens were manufactured by using laser‐based powder bed fusion (L‐PBF) with substantially different sets of process parameters as well as subsequent grinding (G) or milling (M). Despite the substantially different surface topographies, the fatigue tests revealed only a slight influence of the subtractive manufacturing on the fatigue behavior, whereas the different laser‐based powder bed fusion process parameters led to pronounced changes in fatigue strength. In contrast, a significant influence of subtractive finishing on the fatigue properties of the defect‐free continuously cast (CC) reference specimens was observed. This can be explained by a dominating influence of process‐induced defects in laser‐based powder bed fusion material, which overruled the influence of surface machining. However, although both laser‐based powder bed fusion parameter sets resulted in substantial defects, one set yielded similar fatigue strength compared to continuously cast specimens.

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Investigation of the anisotropic fatigue behavior of additively manufactured structures made of AISI 316L with short-time procedures PhyBaLLIT and PhyBaLCHT

Cited by 47 publications

References 26 publications

Influence of the Chemical Composition of the Used Powder on the Fatigue Behavior of Additively Manufactured Materials

Influence of the Chemical Composition of the Used Powder on the Fatigue Behavior of Additively Manufactured Materials

Improving the Defect Tolerance of PBF‐LB/M Processed 316L Steel by Increasing the Nitrogen Content

Influence of microstructural defects and the surface topography on the fatigue behavior of “additively‐subtractively” manufactured specimens made of AISI 316L

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