Effect of scanning strategy on mechanical properties of selective laser melted Inconel 718

Wan, H.Y.; Zhou, Ziyun; Li, C.P.; Chen, G.F.; Zhang, Guangping

doi:10.1016/j.msea.2019.03.007

Cited by 107 publications

(22 citation statements)

References 20 publications

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“…All the specimens were manufactured with an SLM solutions machine (model 500 HL quad 4 × 400 W), using a hatch and contour scanning strategy. Although it is known from literature that different scanning strategies can heavily affect both static and cyclic mechanical behavior of SLMed materials [26], the scanning strategy was kept constant in the present work in order to obtain results comparable with literature data. The SLM process was performed under argon atmosphere.…”

Section: Alsi10mg Alloy and Process Parametersmentioning

confidence: 99%

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

et al. 2019

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It is well-known that many manufacturing parameters affect the quasi-static and the fatigue response of additive manufacturing (AM) parts. In particular, due to the layer-by-layer production, the load orientation, with respect to the building direction, plays a fundamental role for the fatigue response. This paper investigates the fatigue response up to 10 9 cycles (very high cycle fatigue (VHCF)) of selective laser melting (SLM) AlSi10Mg specimens built in a vertical direction. Ultrasonic tension-compression tests (stress ratio of -1) are carried out on as-built Gaussian specimens with a large loaded volume (2300 mm 3 ). Fracture surfaces are investigated with the scanning electron microscope to analyze the defects originating the VHCF failure. Probabilistic S-N curves are estimated and analyzed. Experimental results confirm that the defect size controls the VHCF response, thus highlighting the importance of testing large risk volumes for a reliable assessment of VHCF behavior. The average value of the VHCF strength is close to that of the hourglass specimen tested in the literature. The variability of the VHCF strength is instead significantly larger, due to the scattered size distribution of the defects located near the specimen surface, which is the most critical region for crack initiation.

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Section: Alsi10mg Alloy and Process Parametersmentioning

confidence: 99%

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

et al. 2019

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“…However, the poor machinability of IN718 due to the high strength makes it costly in the application of complex shapes or cavities, such as turbine blade engine fuel nozzle [ 3 ]. Selective laser melting (SLM) is one of the most attractive additive manufacturing (AM) techniques due to its high forming precision, high density and excellent mechanical properties [ 4 ].…”

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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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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“…Email address: camille.guevenoux@polytechnique.edu (Camille Guévenoux) Many process parameters that have an impact on the process thermal history and consequently on the microstructure and mechanical properties of the final part have been widely investigated in the literature: laser speed and power or powder mass flow [10][11][12][13][14], lasing strategy [12,[15][16][17][18][19], laser spot characteristics [20] etc... However, fewer works have focused on the influence of an inter-layer dwell time.…”

Section: Introductionmentioning

confidence: 99%

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

Guévenoux

Hallais

Charles

et al. 2020

Optics & Laser Technology

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Laser Cladding is one of the leading additive manufacturing technologies enabling the repair of metallic components. Their fatigue reliability depends directly on the material microstructure and consequently on the process parameters. This study highlights the influence of the interlayer dwell time on single-track walls for Inconel 718 repaired components. EBSD analyses show that dwell time both reduces grain size and creates a textural stretch of the microstructure. An optimal dwell time between the writing of successive layers can then be introduced to target a specified microstructure gradient at the interface between the original part and the repaired deposit.

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Effect of scanning strategy on mechanical properties of selective laser melted Inconel 718

Cited by 107 publications

References 20 publications

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

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

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

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