Effect of C content on the microstructures and mechanical properties of laser additive manufactured Ni-base superalloys

Xie, Mingjun

doi:10.1016/j.heliyon.2023.e16111

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…Fine and discontinuous carbide particles are capable of impeding grain boundary slip and dislocation motion, which are believed to be the primary factors influencing an alloy’s tensile properties. On the contrary, coarse or continuous carbides are detrimental, where they are prone to enhance cracking susceptibility [ 48 ]. The work indicates that the M 23 C 6 carbide is almost desirable to favor the high-temperature tensile properties and creep life [ 49 ].…”

Section: Discussionmentioning

confidence: 99%

“…The dislocation pile-ups accumulate around the hard particles and a great number of dislocations are stacked in the matrix channels when deformation occurs. The more carbides there are, the more difficult the dislocation movement is [ 48 , 59 ]. As known from Figure 7 and Figure 9 , the highest content of the carbide phase has a size much larger than that of the γ′ phase in the PA sample.…”

Section: Discussionmentioning

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%

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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“…At increased temperatures, the utilisation of scanning electron microscopy (SEM) [17] in conjunction with energy-dispersive X-ray spectroscopy (EDS) enabled the observation of significant expansion of γ' precipitates and the commencement of phase coarsening. The phenomenon of grain expansion was also seen, wherein the presence of bigger equiaxed grains served as an indication of recrystallization occurring at high temperatures [18]. The alloy's mechanical reaction at varying temperatures was evaluated by the implementation of mechanical testing, with the objective of determining its mechanical characteristics [19].…”

Section: Experimental Methodologymentioning

confidence: 99%

Investigation of Microstructure and Mechanical Properties of High-Temperature Super Alloy under Room and Elevated Temperature

Balaji,

Shiva Kumar,

Parmar

et al. 2023

E3S Web Conf.

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This research investigates the microstructural characteristics and mechanical properties of a high-temperature superalloy under different temperature settings. The objective of this study is to analyse the alloy’s reaction to thermal stress, with a specific focus on both room and increased temperatures. By employing sophisticated microscopy techniques, researchers are able to closely examine the development of microstructural characteristics, which provides valuable understanding of phase changes and the dynamics of grains. Simultaneously, evaluations of mechanical properties, including tensile strength, hardness, and resilience, offer a holistic comprehension of the alloy’s operational characteristics. This research enhances the overall understanding of the alloy’s appropriateness for high-temperature applications by considering a wide range of temperatures. The results not only contribute to our fundamental understanding of materials science but also have ramifications for the development of alloys that can endure severe heat conditions.

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“…Commonly used 3D printing processes for stainless steel alloys, aluminum alloys, titanium alloys, and super alloys are laser powder bed fusion (LPBF) [75][76][77][78][79][80][81][82][83] wire arc direct energy deposition [84][85][86], laser metal deposition [87,88], and additive friction stir deposition [89][90][91] processes. The current research in additive manufacturing on aluminum alloys [92][93][94][95][96][97][98][99][100][101][102][103], stainless steel [104][105][106][107], titanium alloys [108][109][110][111][112][113][114][115][116], and nickel-based super alloys [117][118][119][120] aims at improving the microstructure and mechanical properties of materials by reducing the defects…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in Material Waste Recycling: Conventional, Direct Conversion, and Additive Manufacturing Techniques

Golvaskar,

Ojo,

Kannan

2024

Recycling

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To improve the microstructure and mechanical properties of fundamental materials including aluminum, stainless steel, superalloys, and titanium alloys, traditional manufacturing techniques have for years been utilized in critical sectors including the aerospace and nuclear industries. However, additive manufacturing has become an efficient and effective means for fabricating these materials with superior mechanical attributes, making it easier to develop complex parts with relative ease compared to conventional processes. The waste generated in additive manufacturing processes are usually in the form of powders, while that of conventional processes come in the form of chips. The current study focuses on the features and uses of various typical recycling methods for traditional and additive manufacturing that are presently utilized to recycle material waste from both processes. Additionally, the main factors impacting the microstructural features and density of the chip-unified components are discussed. Moreover, it recommends a novel approach for recycling chips, while improving the process of development, bonding quality of the chips, microstructure, overall mechanical properties, and fostering sustainable and environmentally friendly engineering.

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Effect of C content on the microstructures and mechanical properties of laser additive manufactured Ni-base superalloys

Cited by 5 publications

References 31 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

Investigation of Microstructure and Mechanical Properties of High-Temperature Super Alloy under Room and Elevated Temperature

Recent Advancements in Material Waste Recycling: Conventional, Direct Conversion, and Additive Manufacturing Techniques

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