Influence of post-heat-treatment on the microstructure and fracture toughness properties of Inconel 718 fabricated with laser directed energy deposition additive manufacturing

Yu, Xiaoquan; Lin, Xin; Liu, Fencheng; Wang, Lilin; Tang, Yao; Li, Jiacong; Zhang, Shuya; Huang, Weidong

doi:10.1016/j.msea.2020.140092

Cited by 81 publications

(30 citation statements)

References 33 publications

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“…After heat treatment, the columnar dendritic arrays still existed ( Figure 2 b). Recrystallization did not occur due to the low peak temperature in the present study (980 °C), which is lower than the reported recrystallization temperature (1020 °C) for the wrought IN718 [ 17 ]. Small elliptical grains, along with large amounts of rod precipitates, are present in the wrought IN718 specimen ( Figure 2 c).…”

Section: Resultscontrasting

confidence: 79%

“…Fine recrystallized grains with a diameter of about 5 μm were present in the wrought alloy. It has been reported that the static recrystallization temperature of wrought IN718 alloy is about 1020 °C [ 17 ]. As the peak temperature during the hot forging was 1065 °C, large amounts of recrystallized grains were exhibited in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that the SLM material is subjected to the same heat treatment specification (solution at 980 °C for 1 h and double aging at 720 °C for 8 h and then at 620 °C for 8 h, STA) traditionally used for the wrought materials, and this heat treatment is It should be noted that the SLM material is subjected to the same heat treatment specification (solution at 980 • C for 1 h and double aging at 720 • C for 8 h and then at 620 • C for 8 h, STA) traditionally used for the wrought materials, and this heat treatment is not always the best one for the SLM alloy. Previous work by Yu et al has shown that post-heat-treatment specifications have a great effect on the microstructure evolution and the mechanical properties for the Inconel 718 alloy fabricated with laser-directed energy deposition [17]. They found that the additive manufactured IN718 alloy subjected to the homogenization at 1100 • C for 1.5 h prior to the traditional solution plus double aging (HSTA) possessed the best tensile and fracture resistance.…”

Section: Comparison Of the Fatigue Resistance Between Slm And Wroughtmentioning

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: Resultscontrasting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Comparison Of the Fatigue Resistance Between Slm And Wroughtmentioning

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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“…7a ranged from K c ∼ = 70.8-88.7 MPa m 1/2 . This range of fracture toughness is commensurate with other nickel-based alloy systems, that have been reported to range between K c ∼ = 80-100 MPa m 1/2 [44,[61][62][63][64][65][66]. Similarly, scratch-based determination of fracture toughness (treated as a mode II crack) was shown to match (within 10-20%) traditional (mode I) plane strain K IC values for multiple polymers, ceramics and metals, including 2024-T4 and -T351 aluminum, 1045 and 1144 steel, and Ti-6Al-4 V [46].…”

Section: Uniform-composition Of Near-eutectic (Ni 595 Nb 405 ) Alloysupporting

confidence: 80%

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

Jones

DelRio

Pegues

et al. 2021

Journal of Materials Research

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Ni-based superalloys have been studied extensively due to their impressive mechanical properties, including strength and creep resistance at high temperatures. Growing interest surrounding additive manufacturing (AM) methods has led to recent investigations of alloys that are traditionally difficult to process, including Ni-based superalloys. Recent work has shown that AM methods enable high-throughput materials discovery and optimization of difficult- or impractical-to-process alloys, including those with high or even majority refractory element compositions. This work focuses on AM-enabled investigations of composition-dependent mechanical and microstructural properties for Ni–Nb binary alloys. Specifically, we report on the mechanical behavior of compositionally-graded NixNb1−x and uniform composition Ni59.5Nb40.5 specimens made with AM. The AM fabrication process resulted in extraordinarily high strength, attributed to the formation of a dual-phase microstructure consisting of δ-Ni3Nb and µ-Ni6Nb7 intermetallic compounds with nanostructured and multimodal grain size and eutectic lamellar spacing. Graphic Abstract

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“…Moreover, there is also a remarkable difference between their parts after thermal post-processing, including elastic modulus, elongation, and yield strength [87]. Yu et al [88] investigated the effects of thermal post-processing on the room-temperature fracture toughness and microstructure of parts manufactured by laser-based DED technology. The detailed microstructure characterization was executed on as-manufactured and thermally post-processed parts utilizing direct aging, solution treatment plus aging, and homogenization plus solution treatment plus aging.…”

Section: Thermal Post-processingmentioning

confidence: 99%

A Review of Post-Processing Technologies in Additive Manufacturing

Peng

Kong

Fuh

et al. 2021

JMMP

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Additive manufacturing (AM) technology has rapidly evolved with research advances related to AM processes, materials, and designs. The advantages of AM over conventional techniques include an augmented capability to produce parts with complex geometries, operational flexibility, and reduced production time. However, AM processes also face critical issues, such as poor surface quality and inadequate mechanical properties. Therefore, several post-processing technologies are applied to improve the surface quality of the additively manufactured parts. This work aims to document post-processing technologies and their applications concerning different AM processes. Various types of post-process treatments are reviewed and their integrations with AM process are discussed.

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Influence of post-heat-treatment on the microstructure and fracture toughness properties of Inconel 718 fabricated with laser directed energy deposition additive manufacturing

Cited by 81 publications

References 33 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

Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

A Review of Post-Processing Technologies in Additive Manufacturing

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