Additively manufactured Haynes 282: effect of unimodal vs. bimodal γʹ- microstructure on mechanical properties

Ghiaasiaan, Reza; Ahmad, Nabeel; Gradl, Paul R.; Shao, Shuai

doi:10.1016/j.msea.2021.142234

Cited by 25 publications

(8 citation statements)

References 32 publications

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“…The configuration of the γ′ phase has a decisive influence on the mechanical properties of Ni-based superalloys [ 40 , 41 , 42 ]. In general, greater strength and lower ductility are associated with a higher volume fraction of the γ′ phase.…”

Section: Resultsmentioning

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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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: Resultsmentioning

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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“…Ultra-Supercritical (A-USC) plants, such as Haynes 282 and Inconel 740H and alloys [1][2][3][4][5]. The former is a γ′ (Ni3(Al,Ti), L12) strengthened wrought superalloy, which achieves an outstanding balance of properties, including oxidation and corrosion resistance along with mechanical properties at elevated temperatures (650 -760 C) [6,7].…”

Section: Considerable Progress Has Been Made In Development Of New Ni...mentioning

confidence: 99%

Microstructural studies of Stellite 6 hardfacing deposited on nickel-based superalloys subjected to long-time aging

Zhang,

Liu,

et al. 2024

Preprint

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Stellite 6 hardfacing is deposited on Haynes 282 and Inconel 740H via plasma transferred arc (PTA) welding. The fabricated hardfacing specimens are subjected to different post-welding heat treatments, then aged at 760 °C, 815 °C and 871 °C for a time length ranging from 1000 to 30000 h. The microstructures of the hardfacings before and after long-time aging are investigated with SEM/EDS/XRD. It is shown that the PTA welding process causes the hardfacing microstructure deviating from Stellite 6 alloy due to dilution. With participation of other elements from the substrate material, the compositions of both solid solution and carbide/intermetallic of the Stellite 6 hardfacing are modified. In the meanwhile, Ti-rich or Ti/Nb-rich new phases are generated. Long-time aging has an impact on the microstructures of the hardfacings, but at 760 ℃, in particular, for an exposure time less than 20000 h, the microstructures of the hardfacings do not show obvious change. However, when the hardfacing specimens are aged at 815 ℃ and 871 ℃ even for an exposure time of 1000 h only, Al-rich precipitates can occur and the amount of the precipitates increase with aging time. These brittle precipitates generally have a detrimental effect on the performance of the hardfacings, because they can deteriorate the ductility of the hardfacings. With the presence of Al-rich precipitates the hardness of the hardfacings decreases.

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“…A number of recent studies on the AM technique have focused on the production of nickel superalloys [ 4 , 6 , 7 ], including Haynes 282 superalloy [ 2 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…The authors of studies [ 11 , 12 , 13 , 14 , 16 , 17 ] also conducted research on the Haynes 282 alloy produced using PBF technology. Shaikh et al [ 12 ] focused on the mechanical and microstructural studies of the alloy.…”

Section: Introductionmentioning

confidence: 99%

“…The γ-phase was observed only after the second heat treatment, whereas HIP precipitates the γ-phase in a single step. The studies conducted in work [ 11 ] also concerned the effect of Haynes 282 heat treatment, in particular the effects of lower heat treatment temperatures on the microstructure and tensile properties of Haynes 282 produced by PBF. It was shown that a solution temperature range of 1062–1146 °C could reduce the dendritic microstructure, resulting in a similar distribution of grain boundary carbides.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Plastic Deformation on the Microstructure and Tensile Strength of Haynes 282 Nickel Superalloy Produced by DMLS and Casting

et al. 2022

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The article presents the results of research on the influence of plastic deformation on the microstructure and tensile strength of Haynes 282 nickel superalloy produced by direct metal laser sintering (DMLS) and a conventional technique (casting). Samples were tested for dimensional accuracy using a 3D scanner. Then, the samples were subjected to plastic deformation by rolling. The microstructures of the DMLS and the as-cast samples were analysed using a scanning electron microscope. The strength properties of the samples were determined in a static tensile test. Microhardness measurements of the samples were also performed. Based on the analysis of the dimensional accuracy, it was found that the surface quality of the components produced by DMLS is dependent on the input parameters of the 3D printing process. Using the DMLS method, it is possible to produce Haynes 282 with a fine-crystalline microstructure containing dendrites. The fine-crystalline dendritic microstructure and low porosity showed very good tensile strength compared to the as-cast material. It was also found that the increase in the degree of plastic deformation of the as-cast Haynes 282 and the samples produced by the DMLS technique resulted in an increase in the strength of the tested samples, with reduced ductility.

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Additively manufactured Haynes 282: effect of unimodal vs. bimodal γʹ- microstructure on mechanical properties

Cited by 25 publications

References 32 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

Microstructural studies of Stellite 6 hardfacing deposited on nickel-based superalloys subjected to long-time aging

The Impact of Plastic Deformation on the Microstructure and Tensile Strength of Haynes 282 Nickel Superalloy Produced by DMLS and Casting

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