An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718

Muhammad, Muztahid; Frye, Palmer; Simsiriwong, Jutima; Shao, Shuai

doi:10.1016/j.ijfatigue.2020.106038

Cited by 48 publications

(13 citation statements)

References 45 publications

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“…The microstructure discontinuity is believed to be either the brittle second phase such as Laves phase and δ phase or the multiple crystallographic facets. The presence of crystallographic facets are the results of the initiation and growth of the microstructurally small cracks and are strong evidence for the fatigue crack initiation at persistent slip bands (PSB) [ 14 ]. Figure 7 e shows a fatigue crack initiation site of a cavity with an irregular shape due to the lack of fusion.…”

Section: Resultsmentioning

confidence: 99%

“…Zhao et al investigated the initiation and early-stage crack growth under VHCF at RT, 750 • C and 850 • C on directionally solidified Ni-base superalloy [13]. They found that the fatigue strength at 850 • C was higher than that at 750 • C and RT in the VHCF regime due to the higher threshold for propagating the early-stage crack at 850 • C. Muhammad et al found that the fatigue cracks of SLM IN718 after VHCF tests at RT, initiated from intragranular slip bands near or at the surface, and strong anisotropy in the fatigue resistance was exhibited in the SLM alloy due to the presence of columnar grains along the build direction [14].…”

Section: Introductionmentioning

confidence: 99%

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Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

et al. 2021

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This study investigates the very-high-cycle fatigue (VHCF) behavior at elevated temperature (650 °C) of the Inconel 718 alloy fabricated by selective laser melting (SLM). The results are compared with those of the wrought alloy. Large columnar grain with a cellular structure in the grain interior and Laves/δ phases precipitated along the grain boundaries were exhibited in the SLM alloy, while fine equiaxed grains were present in the wrought alloy. The elevated temperature had a minor effect on the fatigue resistance in the regime below 108 cycles for the SLM alloy but significantly reduced the fatigue strength in the VHCF regime above 108 cycles. Both the SLM and wrought specimens exhibited similar fatigue resistance in the fatigue life regime of fewer than 107–108 cycles at elevated temperature, and the surface initiation mechanism was dominant in both alloys. In a VHCF regime above 107–108 cycles at elevated temperature, the wrought material exhibited slightly better fatigue resistance than the SLM alloy. All fatigue cracks are initiated from the internal defects or the microstructure discontinuities. The precipitation of Laves and δ phases is examined after fatigue tests at high temperatures, and the effect of microstructure on the formation and the propagation of the microstructural small cracks is also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

et al. 2021

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“…[1][2][3] Especially in recent days, the concept of very-high-cycle fatigue (VHCF) with over 10 7 cycles fatigue life has been widely concerned, and a series of research results have been obtained. [4][5][6] However, most of the experimental studies are limited to room temperature, and the S-N characteristics, 7-13 failure mechanism, [14][15][16][17][18][19][20][21][22][23][24] and fatigue life evaluation methods [25][26][27][28][29][30][31][32] under elevated temperature environment in VHCF regime are not yet well understood. Therefore, in order to ensure the long-term safety of structural components, the VHCF fatigue characteristics of structural materials in elevated temperature environment still needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Zhang

et al. 2021

Fatigue Fract Eng Mat Struct

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The tension-tension test with stress ratio 0.1 was conducted to clarify highcycle and very-high-cycle fatigue properties of Ni-based superalloy at 750 C by combining two-and three-dimensional microscopic observations. Results show that as stress level decreases, fatigue failure is less likely to be induced by pore, while the possibility of crystallographic facet-induced failure increases, and finally, the duplex S-N curves are formed. The larger roughness of crack nucleation region is mainly attributed to the geometric incompatibility of grains and the plastic deformation at crack tip. Under the influence of elevated temperature and vacuum environment, the transition size from small crack to long crack is approximately equal to the grain size. Combined with the evaluation of threshold values, the internal failure mechanism is elucidated. Finally, from the viewpoint of energy, a fatigue life prediction model is proposed, and the predicted results are in good agreement with the experimental ones.

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“…Stress‐life (S‐N) plot of experimental data from Muhammad et al 66 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Vhcf Response Of Inconel 718: Experimental Resultsmentioning

confidence: 99%

“…On the contrary, the vertical build direction guarantees a good VHCF strength at 10 9 cycles, while it is highly reduced in diagonally built specimens. Moreover, in Muhammad et al 66 two aspects are highlighted by the authors: Firstly, the need of enlarging the tested risk volume, since the hourglass shape does not permit to properly assess the defects population, and consequently, to reliably estimate the VHCF response (as already noticed for AlSi10Mg in Tridello et al 44 ). Secondly, when ultrasonic fatigue tests are carried out, possible strain rate effects and plastic phenomena should be verified and considered, in order to avoid an overestimation of the VHCF response.…”

Section: Vhcf Response Of Inconel 718: Experimental Resultsmentioning

confidence: 99%

Very high cycle fatigue (VHCF) response of additively manufactured materials: A review

Caivano

Tridello

Chiandussi

et al. 2021

Fatigue Fract Eng Mat Struct

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Recently, the diffusion of components produced through additive manufacturing (AM) processes has significantly increased. Concurrently, to ensure the safe employment of AM components, the research has focused on the assessment of their fatigue response. In the present paper, a comprehensive literature review on the very high cycle fatigue (VHCF) response of materials produced through AM processes is provided. The experimental results on the VHCF response of Ti6Al4V,

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An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718

Cited by 48 publications

References 45 publications

Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Very high cycle fatigue (VHCF) response of additively manufactured materials: A review

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