Spark plasma sintering of Stellite®-6 superalloy

Khouzani, Mahdi Kiani; Bahrami, Abbas; Mehr, M. Yazdan

doi:10.1016/j.jallcom.2018.12.186

Cited by 22 publications

(10 citation statements)

References 26 publications

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“…It is a phase that enhances mechanical strength and pin dislocation movement. [42,43] In fact, graphene is thought to be a ''super material'' due to the high mechanical properties it possesses (0.5 to 1 TPa elastic modulus and 130 GPa tensile strength). [33,44] Therefore, the addition of graphene is known to improve the mechanical properties of the sintered alloys.…”

Section: The Engineering Stress-strain Curve Analysismentioning

confidence: 99%

Microstructure and Mechanical Properties of Spark Plasma-Sintered Graphene-Reinforced Inconel 738 Low Carbon Superalloy

Ogunbiyi

Sadiku

Adesina

et al. 2021

Metall Mater Trans A

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The effects of the addition of different percentage compositions of graphene nanoplatelets (GNPs) to a nickel-based superalloy were investigated in this study. A spark plasma sintering (SPS) method was employed in the development of the nickel-based alloy/composites, and the developed bulk nickel-based alloy and its composites were from high-purity micron-size powder. Subsequently, the microstructure and mechanical properties (i.e., microhardness and tensile yield strength) were examined. The SPS-processed nickel-based alloy/composite samples exhibited high densification ranging from 97.64 to 98.87 pct. The addition of GNPs greatly influenced the microhardness results, which ranged from 384 to 459 Hv, and the tensile yield strength between 675 and 883 MPa. The results indicated that the addition of graphene nanoplatelets played a significant role in the microstructure and mechanical properties of spark plasma-sintered nickel-based composites. The addition of graphene nanoplatelets caused grain boundary strengthening, load transfer from the matrix to GNPs, and grain boundary strengthening by impeding dislocation movement. Coupled with the improvement caused by GNPs is the enhancement of the mechanical properties of the materials developed as a result of the high relative density values obtained.

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Section: The Engineering Stress-strain Curve Analysismentioning

confidence: 99%

Microstructure and Mechanical Properties of Spark Plasma-Sintered Graphene-Reinforced Inconel 738 Low Carbon Superalloy

Ogunbiyi

Sadiku

Adesina

et al. 2021

Metall Mater Trans A

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“…SPS has the advantages of fast temperature rise, short sintering period, high efficiency, and that fine grains can be obtained [ 13 , 14 ]. In the field of high-temperature alloys, M. Kiani Khouzani et al [ 15 ] studied the microstructure and mechanical properties of SPS cobalt-based superalloy. In the field of cemented carbide, Huang et al [ 16 ] studied the effect of Cu on the densification, microstructures, and properties of WC-6Co under different sintering temperatures by SPS.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS)

Qin

Wang

et al. 2023

Materials

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This research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS are specifically analyzed. Experimental results demonstrate that SPS technology, when applied to sinter at the sub-solidus temperature of the γ’ phase, effectively mitigates the formation of a prior particle boundary (PPB). Based on experimental and computational findings, it has been determined that the presence of elemental segregation and Al2O3 oxides on the surface of pre-alloyed powders leads to the preferential precipitation of MC-type carbides and Al2O3 and ZrO2 oxides in the sintering necks during the hot consolidation process, resulting in the formation of PPB. This study contributes to the understanding of microstructural modifications achieved through SPS technology, providing crucial information for optimizing sintering conditions and reducing the widespread occurrence of PPB, ultimately enhancing the material performance of PM nickel-based superalloys.

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“…A plasma discharge between powder particle occurs which lead to their sintering [23][24][25][26]. This process has been widely used to obtain magnetic materials, ODS alloys and composite Fe, Ni and Co superalloy reinforced with ceramic particles [16,27,28]. In our previous study, we obtained the Al 2 O 3 /Ni composite, in which the alumina particles are uniformly dispersed in a quasi-continuously Ni network [29].…”

Section: Introductionmentioning

confidence: 99%

Superalloy/Al2O3 type composite compacts obtained by spark plasma sintering from mechanically alloyed powders

et al. 2022

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Fe-base Superalloy/Al2O3 type composite compacts were successfully obtained by spark plasma sintering from mechanically alloyed powders. The superalloy powders without Al2O3 and superalloy/Al2O3 type composites powders with 5 and 10 %vol. Al2O3 were synthesized from elemental powders in a high energy planetary mill. The influence of the milling process on particle size evolution has been determined using a Laser Particle Size Analyzer with an analysis field of 0.1-1000 ?m. The composite compacts were obtained by spark plasma sintering. Both, composite powders, and compacts were investigated by X-ray diffraction (XRD), high temperature X-ray diffraction (HT-XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).

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Spark plasma sintering of Stellite®-6 superalloy

Cited by 22 publications

References 26 publications

Microstructure and Mechanical Properties of Spark Plasma-Sintered Graphene-Reinforced Inconel 738 Low Carbon Superalloy

Microstructure and Mechanical Properties of Spark Plasma-Sintered Graphene-Reinforced Inconel 738 Low Carbon Superalloy

Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS)

Superalloy/Al2O3 type composite compacts obtained by spark plasma sintering from mechanically alloyed powders

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