Effect of temperature on tensile behavior, fracture morphology, and deformation mechanisms of Nickel-based additive manufacturing 939 superalloy

Zou, Tongfei; Liu, Meng; Cai, Yifan; Wang, Quanyi; Jiang, Yunqing; Wang, Yunru; Gao, Zhenheng; Pei, Yubing; Zhang, Hong; Liu, Yongjie; Wang, Qingyuan

doi:10.1016/j.jallcom.2023.170559

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…The change in the deformation mechanism is another cause behind the ductility drop at 900 °C. According to several pieces of research [ 61 , 62 , 63 ], once the deformation mechanism changes, the ductility might decrease simultaneously. The size of the γ′ phase and deformation temperature usually affect the deformation mechanism.…”

Section: Discussionmentioning

confidence: 99%

“…In our study, when loading at room temperature, the high-density dislocations slip in the Ni matrix, leading to the superior work hardening in the AB sample. The combination of inter- and trans-granular fracture modes in the aged samples indicates that the dislocations move through shearing of the γ′ precipitates in pairs of a/2<101> matrices [ 62 , 66 ]. Zhang et al [ 28 ] obtained γ′ phases measuring approximately 50 nm on average.…”

Section: Discussionmentioning

confidence: 99%

“…The SA and PSA samples which are decorated with discontinuous carbide particles possess higher resistance to straight grain boundary sliding, thereby enhancing tensile strength and facilitating the movement of dislocations across grain boundaries [60]. The change in the deformation mechanism is another cause behind the ductility drop at 900 • C. According to several pieces of research [61][62][63], once the deformation mechanism changes, the ductility might decrease simultaneously. The size of the γ ′ phase and deformation temperature usually affect the deformation mechanism.…”

Section: The Differences Of Mechanical Performancementioning

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: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Differences Of Mechanical Performancementioning

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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Tensile Deformation Behaviors and Microstructure Evolution Under Various Temperatures for MAR‐M247 Nickel‐Based Superalloy

Jiang,

Zou,

Liu

et al. 2024

Adv Eng Mater

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The study aims to analyze the tensile behavior and microstructural changes in MAR‐M247 nickel‐based superalloy across different temperatures. Tensile behavior is examined under a constant strain rate of 2.5 × 10−4 s−1 at varying temperatures. Results indicate a temperature‐dependent nature of the alloy's tensile properties. At 550 °C, a Portevin–Le Chatelier effect is observed, attributed to twinning nucleation and carbon atom diffusion. Dynamic recrystallization occurs at 950 °C, manifesting in a sinusoidal stress–strain curve. At room temperature, the primary fracture mechanism involves dislocation shearing in the γ matrix, with minor dislocation shearing in the γ′ phase. At 550 °C, carbides along grain boundaries and the γ′ phase impede dislocation motion. Concurrently, dislocations shear the γ′ phase, leading to the formation of superlattice intrinsic stacking faults and Kear–Wilsdorf locks, thereby enhancing tensile strength. However, at 950 °C, dislocation motion primarily involves climb, carbides decompose, the γ′ phase softens and enlarges, resulting in a notable decrease in tensile strength.

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Preliminary study on the dynamic deformation mechanism of CoCrFeNi high-entropy alloy and its application in the shaped charge liner

Li,

Ding,

Zhao

et al. 2024

Journal of Alloys and Compounds

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Effect of temperature on tensile behavior, fracture morphology, and deformation mechanisms of Nickel-based additive manufacturing 939 superalloy

Cited by 9 publications

References 55 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

Tensile Deformation Behaviors and Microstructure Evolution Under Various Temperatures for MAR‐M247 Nickel‐Based Superalloy

Preliminary study on the dynamic deformation mechanism of CoCrFeNi high-entropy alloy and its application in the shaped charge liner

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