Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718

Ogawahara, Manatsu; Sasaki, Shinya

doi:10.1299/mej.20-00362

Cited by 4 publications

(4 citation statements)

References 48 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, Inconel shows a higher tolerance for defects in terms of fatigue life, as can be seen in Figure 3 . Ogawahara et al [ 4 ] arrived at a similar conclusion in the study of Inconel samples with varying internal defects at a constant stress amplitude. In particular, they showed a negligible effect on the fatigue limit and the fatigue life of internal defects of different dimensions.…”

Section: Resultsmentioning

confidence: 54%

“… Kitagawa diagram for both Ti6Al4V ( a ) and Inconel 718 ( b ) showing experimental data points that survived more than one million cycles. Data points from literature were also used (Gong et al, 2012 [ 17 ], Ogawahara et al, 2020 [ 4 ]). …”

Section: Figurementioning

confidence: 99%

“…On the one hand, the literature concerning effects of defects and fatigue performance of Ti6Al4V is rather extensive [ 2 , 3 ]; but on the other hand, Inconel 718 made by AM has been less widely studied. An attempt may be found in the work from Ogawahara et al [ 4 ], where the authors investigated samples with internal defects and their influence on the fatigue strength, or in the one from Balachandramurthi et al [ 5 ] where mainly the role of HIP was evaluated. Overall, although the effect of porosity on the mechanical behavior is widely discussed [ 6 ], a detailed and rigorous comparison of fatigue performance of parts produced by LPBF, both in Titanium and Inconel, subjected to internal defects, is not available in the open literature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Internal Defects on the Fatigue Behavior of Additive Manufactured Metal Components: A Comparison between Ti6Al4V and Inconel 718

et al. 2022

View full text Add to dashboard Cite

In order to obtain a widespread application of Additive Manufactured (AM) technology in the aircraft industry for fatigue critical parts, a detailed characterization of the Fatigue and Damage Tolerance (F&DT) behavior of structural components is required. Metal AM techniques in particular are prone to internal defects inherently present due to the nature of the process, which have a detrimental effect on fatigue properties. In the present work, Ti6Al4V and Inconel 718 coupons with artificially induced defects of different dimensions were produced by the Laser Powder Bed Fusion (LPBF) technique. Fatigue tests were performed, and a different defect sensitiveness was observed between the two materials with Inconel being more defect tolerant compared to Titanium. The environmental role at the crack tip of internal defects was discussed, and based on a purely fracture mechanics approach, a simplified stress–life–defect size model was finally devised. The experimental test results together with the information obtained from the fracture surface analysis of tested samples are used to validate the model predictions. The proposed approach could be adopted to define a critical defect size map to be used for tailored Non-Destructive Testing (NDT) evaluation.

show abstract

Section: Resultsmentioning

confidence: 54%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Internal Defects on the Fatigue Behavior of Additive Manufactured Metal Components: A Comparison between Ti6Al4V and Inconel 718

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the case of a fine-grained structure, the γ″-phase size increases and the slip bands are more homogeneously distributed in the grains. In the work of Ogawahara et al [ 29 ], the relationship between the size of the internal defects and the fatigue life of IN718 was discussed. Based on their research, it is negligible and minimally affects the fatigue life of the alloy.…”

Section: Introductionmentioning

confidence: 99%

The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

et al. 2021

View full text Add to dashboard Cite

Concerning the use of modern technologies and manufacturing systems in the production of high-stress components from Ni-base superalloys and the optimization of the production process, knowledge of the microstructure–mechanical properties relationship is very important. The microstructure of Ni-base superalloys is very closely related to the chemical composition. With the high number of alloying elements, various phases are presented in the structure of Ni-base superalloys, which have a predominantly positive effect on the mechanical properties, but also phases that reduce, in particular, the heat resistance of these materials. The aim of the presented paper is the quantification of structural parameters of two types of cast alloys, ZhS6K and IN738, where the effect of dwell at 10 and 15 h at 800 °C on the change in morphology and volume fraction of the γ′-phase precipitate was studied. The detected changes were verified by the Vickers hardness test. The IN718 superalloy was chosen as a representative of the wrought superalloy. This alloy was also annealed for 72 h at a temperature of 800 °C, and the quantification of structural parameters was performed by EDS mapping and TEM analysis. Another partial goal was to assess the effect of changes in the volume fraction of the γ′-phase and δ-phase on the change in the high-cycle fatigue life of superalloy IN 718. This superalloy was tested by dynamic cyclic loading with cycle asymmetry parameter R = −1 at an ambient temperature of 22 ± 5 °C and at a temperature of 700 ± 5 °C and with cycle asymmetry parameter R < 1 (three-point bending load) after annealing at 700 °C/72 h. The results of the quantitative analyses and fatigue tests will be further used in optimizing the design of Ni-base superalloy components by modern technologies such as additive technologies for the production of turbine blades and implemented within the philosophy of Industry 4.0.

show abstract

Powder densification behavior and microstructure formation mechanism of W-Ni alloy processed by selective laser melting

Zhong

Wei

Yue

et al. 2022

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718

Cited by 4 publications

References 48 publications

Effect of Internal Defects on the Fatigue Behavior of Additive Manufactured Metal Components: A Comparison between Ti6Al4V and Inconel 718

Effect of Internal Defects on the Fatigue Behavior of Additive Manufactured Metal Components: A Comparison between Ti6Al4V and Inconel 718

The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

Powder densification behavior and microstructure formation mechanism of W-Ni alloy processed by selective laser melting

Contact Info

Product

Resources

About