Effect of Heat Treatment on Microstructure and Properties of FGH4096M Superalloy Processed by Selective Laser Melting

Hao, Zhibo; Tian, Tian; Peng, Shiqing; Chen, Ge; Li, Xinggang; Jia, Chonglin; Guo, Chuan; Zhu, Qiang

doi:10.1007/s12540-019-00467-0

Cited by 16 publications

(3 citation statements)

References 27 publications

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“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/ma17051084/s1, Figure S1 (c) TEM-EDS mapping results. References [11,52,57,[69][70][71][72]…”

Section: Supplementary Materialsmentioning

confidence: 99%

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Influence of Various Heat Treatments on Microstructures and Mechanical Properties of GH4099 Superalloy Produced by Laser Powder Bed Fusion

Liu,

Wang,

Guo

et al. 2024

Materials

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The microstructures and mechanical properties of a γ′-strengthened nickel-based superalloy, GH4099, produced by laser powder bed fusion, at room temperature and 900 °C are investigated, followed by three various heat treatments. The as-built (AB) alloy consists of cellular/dendrite substructures within columnar grains aligning in <100> crystal orientation. No γ′ phase is observed in the AB sample due to the relatively low content of Al +Ti. Following the standard solid solution treatment, the molten pool boundaries and cellular/dendrite substructures disappear, whilst the columnar grains remain. The transformation of columnar grains to equiaxed grains occurs through the primary solid solution treatment due to the recovery and recrystallization process. After aging at 850 °C for 480 min, the carbides in the three samples distributed at grain boundaries and within grains and the spherical γ′ phase whose size is about 43 nm ± 16 nm develop in the standard solid solution + aging and primary solid solution + aging samples (SA and PA samples) while the bimodal size of cubic (181 nm ± 85 nm) and spherical (43 nm ± 16 nm) γ′ precipitates is presented in the primary solid solution + secondary solid solution + aging sample (PSA samples). The uniaxial tensile tests are carried out at room temperature (RT) and 900 °C. The AB sample has the best RT ductility (~51% of elongation and ~67% of area reduction). Following the three heat treatments, the samples all acquire excellent RT tensile properties (>750 MPa of yield strengths and >32% of elongations). However, clear ductility dips and intergranular fracture modes occur during the 900 °C tensile tests, which could be related to carbide distribution and a change in the deformation mechanism.

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Section: Supplementary Materialsmentioning

confidence: 99%

“…Figure S3: (a,b) TEM bright-field images of the AB sample; ( c ) TEM-EDS mapping results. References [ 11 , 52 , 57 , 69 , 70 , 71 , 72 ] are cited in the Supplementary Materials.…”

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confidence: 99%

Influence of Various Heat Treatments on Microstructures and Mechanical Properties of GH4099 Superalloy Produced by Laser Powder Bed Fusion

Liu,

Wang,

Guo

et al. 2024

Materials

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“…After annealing, the microstructure (case 6) changes significantly, due to the high dislocation density at boundaries of columnar dendrites (and hence high stored energy) inside the L-PBF part, as a result of the high thermal gradients during rapid solidification [40]. At an annealing temperature of 1275 • C, which reaches the recovery and static recrystallization temperature of the NiTa, the high stored energy in the L-PBF specimen acts as the driving force to promote the recrystallization of columnar dendrites [40,41]. Meanwhile, the migration of columnar dendrite grain boundaries and the diffusion of elements across boundaries accelerate the elimination of dendritic and cellular structures [42].…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Effect of Vacuum Heat Treatment on the Microstructure of a Laser Powder-Bed Fusion-Fabricated NiTa Alloy

Bussmann

Chattopadhyay

2022

Metals

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The semiconductor industry uses a physical vapor-deposition process, with a nickel-tantalum (NiTa) alloy-sputtering target, to apply an amorphous NiTa thin film layer between the magnetic soft underlayer and substrate of a heat-assisted magnetic-recording hard disk drive. Currently, the alloy-sputtering target is produced through a hot-pressing (HP) process followed by a hot isostatic pressing (HIP). In this study, we demonstrate a better process for producing the sputtering targets, using laser powder-bed fusion (L-PBF) followed by vacuum heat treatment (VHT), to produce alloy targets with superior microstructural characteristics that will produce better-quality thin films. We compare as-fabricated (just L-PBF) specimens with specimens produced by L-PBF and then annealed at different conditions. Where the as-fabricated specimens are characterized by columnar dendrites, annealing at 1275 °C for 4 h produces a uniform equiaxed grain microstructure and a uniformly dispersed fcc Ta precipitate. In addition, the average microhardness value is reduced from 725 ± 40 to 594 ± 26 HV0.2 and the maximum compressive residual stress is reduced from 180 ± 50 MPa to 20 ± 10 MPa as the result of dislocation elimination during the recovery and recrystallization process. Finally, due to microstructure recrystallization, the VHT-treated L-PBF NiTa specimens exhibit a smaller grain size (2.1 ± 0.2 µm) than the traditional HIP-treated HP specimens (6.0 ± 0.6 µm).

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Multi-Objective Optimization of Process Parameters in Resistance Spot Welding of A36 Mild Steel and Hot Dipped Galvanized Steel Sheets Using Non-dominated Sorting Genetic Algorithm

Kemda

Barka

Jahazi³

et al. 2021

Met. Mater. Int.

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Effect of Heat Treatment on Microstructure and Properties of FGH4096M Superalloy Processed by Selective Laser Melting

Cited by 16 publications

References 27 publications

Influence of Various Heat Treatments on Microstructures and Mechanical Properties of GH4099 Superalloy Produced by Laser Powder Bed Fusion

Influence of Various Heat Treatments on Microstructures and Mechanical Properties of GH4099 Superalloy Produced by Laser Powder Bed Fusion

Effect of Vacuum Heat Treatment on the Microstructure of a Laser Powder-Bed Fusion-Fabricated NiTa Alloy

Multi-Objective Optimization of Process Parameters in Resistance Spot Welding of A36 Mild Steel and Hot Dipped Galvanized Steel Sheets Using Non-dominated Sorting Genetic Algorithm

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