Impact of homogenization on microstructure-property relationships of Inconel 718 alloy prepared by laser powder bed fusion

Zhao, Yunhao; Meng, Fan Lai; Liu, Chuan; Tan, Susheng

doi:10.1016/j.msea.2021.141973

Cited by 20 publications

(14 citation statements)

References 55 publications

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“…For the lower area, they were: laser power of 76 W, scanning speed of 785 mm/s, and hatch distance of 0.08 mm. Heat treatments: It has been reported that the first aging treatment has the most relevant effect on the mechanical properties of the material, such as the ultimate tensile strength, yield strength, and hardness [8,13,15]. For this reason, in this work, three different heat treatments were applied to the AM-IN718, varying times for the first aging stage (6, 8, and 10 h), according to Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of the microstructure of IN718 fabricated by AM, the literature reported δ and Laves phases in the molten pool boundaries driven by the segregation of some elements. It has been identified as the reason for the low ductility and lower toughness of additively manufactured IN718 [7,[13][14][15]. According to the literature review reported by Wang et al [1], the δ phase also precipitates at grain boundaries in a needle-like form.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the detrimental phases can be dissolved in the matrix by proper heat treatments. According to the literature [8,[13][14][15], the heat treatment for IN718 promotes the nucleation and growth of the reinforcement phases, such as γ and γ . Moreover, it controls the size and concentration of secondary phases, such as δ and Laves phases, and carbides.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Microhardness Evolution of Additively Manufactured Cellular Inconel 718 after Heat Treatment with Different Aging Times

Salgado-López

Martínez‐Franco

Cruz-González

et al. 2022

Metals

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The manufacture of cellular structures using high-performance materials is possible thanks to the additive manufacturing of metals. However, it is well known that the mechanical and microstructural properties of metals manufactured by this technique do not correspond to those of the same metals manufactured by conventional methods. It is well known that the mechanical properties depend on the direction of manufacture, the size of the pieces, and the type of cell structure used. In addition, the effect of heat treatments on parts manufactured by additive manufacturing differs from parts manufactured by conventional methods. In this work, the microstructure and microhardness of cellular structures of Inconel 718, manufactured by additive manufacturing under heat treatments with different aging times, were evaluated. It was found that the time of the first aging impacts the microhardness and its homogeneity, affecting the microstructure. The highest hardness was obtained for an aging time of 8 h, while the lowest standard deviation was obtained at 10 h. Finally, it is shown that the aging time influences a more homogeneous distribution of the elements and phases.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Microhardness Evolution of Additively Manufactured Cellular Inconel 718 after Heat Treatment with Different Aging Times

Salgado-López

Martínez‐Franco

Cruz-González

et al. 2022

Metals

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“…Figure 6 compares microstructure before and after heat treatment of Inconel 718 superalloy prepared using different manufacturing methods: suction cast, LPBF, and powder-based laser DED. Due to the difference in residual stress inherited from the manufacturing methods [27] , grain structure evolution shows a distinct difference among these three types of samples. Although the HT AM processing techniques can fabricate samples with the desired shape and composition, its processing window can be challenging to identify for some alloy compositions, because not all materials have a good printability for AM processing.…”

Section: More Opportunities and Challengesmentioning

confidence: 99%

Additive manufacturing as a tool for high-throughput experimentation

Xiong¹

2022

J Mater Inf

Self Cite

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Additive manufacturing (AM) is a disruptive technology with a unique capability in fabricating parts with complex geometry and fixing broken supply chains. However, many AM techniques are complicated with their processing features due to complex heating and cooling cycles with the melting of feedstock materials. Therefore, it is quite challenging to directly apply the materials design and processing optimization method used for conventional manufacturing to AM techniques. In this viewpoint paper, we discuss some of the ongoing efforts of high-throughput (HT) experimentation, which can be used for materials development and processing design. Particularly, we focus on the beam- and powder-based AM techniques since these methods have demonstrated success in HT experimentation. In addition, we propose new opportunities to apply AM techniques as the materials informatic tools contributing to materials genome.

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“…In summary, PFM has been well applied in the simulation of microstructure in additive manufacturing. But it only focuses on microstructure morphology of dendrite and secondary phases, and does not simulate the evolution of microstructure characteristics in the subsequent heat treatment (Wang and Chou, 2018;Kumara et al, 2019;Kumara et al, 2020;Cao et al, 2021;Zhao et al, 2021). The microstructure in solidification and subsequent heat treatment jointly determines the performance of Inconel 718 samples fabricated by the L-PBF.…”

Section: ; Dementioning

confidence: 99%

Phase field simulation of microstructure evolution and process optimization during homogenization of additively manufactured Inconel 718 alloy

Chen

Shi

et al. 2022

Front. Mater.

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An in-depth and integral understanding of the microstructural evolution during thermomechanical process (TMP) is of great significance to optimize the manufactural process for high-quality components via additive manufacturing. The solidified microstructure model of Inconel 718 alloy fabricated via laser powder bed fusion (L-PBF) is established by multiphase field model firstly. Furthermore, the microstructural evolution during homogenization process is simulated and optimized in this study. Phase field simulation results show that the concentration gradient of Nb along the radius of the cellular substructure decreases from the initial 1.217 wt% to 0.001 wt%, and 67% area fraction of the Laves phase dissolves at the homogenization time of 0.5 h, which have achieved the homogenization purpose. The experimental results show that the average grain size decreases from 9.4 μm to 5.9 μm at the homogenization time from 1.5 h (the standard AMS 5383) to 0.5 h, which resulted in the increase of yield strength and tensile strength of the aged alloy by 14% and 6%, respectively. This research can provide guidance and reference for the microstructural control as well as the TMP parameters design of the additive manufactured alloys.

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Impact of homogenization on microstructure-property relationships of Inconel 718 alloy prepared by laser powder bed fusion

Cited by 20 publications

References 55 publications

Microstructure and Microhardness Evolution of Additively Manufactured Cellular Inconel 718 after Heat Treatment with Different Aging Times

Microstructure and Microhardness Evolution of Additively Manufactured Cellular Inconel 718 after Heat Treatment with Different Aging Times

Additive manufacturing as a tool for high-throughput experimentation

Phase field simulation of microstructure evolution and process optimization during homogenization of additively manufactured Inconel 718 alloy

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