Effect of heat treatment on mechanical property and microstructure of a powder metallurgy nickel-based superalloy

Wu, Hongyu; Zhuang, Xiaoli; Nie, Yan; Li, Yunping; Jiang, Liang

doi:10.1016/j.msea.2019.03.064

Cited by 35 publications

(14 citation statements)

References 41 publications

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“…As the Al content increased, the density of the TaNbVTiAl x RHEAs decreased gradually from 9.16 g/cm 3 of Al0 alloy to 7.89 g/cm 3 of Al1.0 alloy, which was very close to that of nickel-based superalloys [ 22 ].…”

Section: Resultsmentioning

confidence: 92%

Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

Guo

Liu

et al. 2020

Entropy

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A series of TaNbVTiAlx (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) refractory high-entropy alloys (RHEAs) with high specific strength and reasonable plasticity were prepared using powder metallurgy (P/M) technology. This paper studied their microstructure and compression properties. The results show that all the TaNbVTiAlx RHEAs exhibited a single BCC solid solution microstructure with no elemental segregation. The P/M TaNbVTiAlx RHEAs showed excellent room-temperature specific strength (207.11 MPa*cm3/g) and high-temperature specific strength (88.37 MPa*cm3/g at 900 °C and 16.03 MPa*cm3/g at 1200 °C), with reasonable plasticity, suggesting that these RHEAs have potential to be applied at temperatures >1200 °C. The reasons for the excellent mechanical properties of P/M TaNbVTiAl0.2 RHEA were the uniform microstructure and solid solution strengthening effect.

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Section: Resultsmentioning

confidence: 92%

Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

Guo

Liu

et al. 2020

Entropy

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“…The mechanical properties of the alloy were directly related to its microstructure [ 20 , 28 ]. The main strengthening mechanism of the nickel-based single-crystal superalloy used in this study was the cubic coherent composition of γ′ phase and γ phase.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…Recently, Letniko et al [ 19 ] studied the effect of quenching rate on the microstructure and mechanical properties of cast superalloy VZh175-ID and calculated the relationship between the cooling rate and the average size of the γ′ phase and the strength of the material. Wu et al [ 20 ] studied the effects of single-step and multistep heat treatment on the mechanical properties of powdered superalloys. The cooling rate plays an important role in tailoring the microstructure, size and size distribution of γ′ precipitates, which is clarified by the precipitation calculation enabled by multicomponent thermodynamic database.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Cooling Rates on the Microstructure and High-Temperature Mechanical Properties of a Nickel-Based Single Crystal Superalloy

2020

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The as-cast alloy of nickel-based single-crystal superalloy was used as the research object. After four hours of solution treatment at 1315 °C, four cooling rates (water cooling (WC), air cooling (AC) and furnace cooling (FC1/FC2)) were used to reduce the alloy to room temperature. Four different microstructures of nickel-based superalloy material were prepared. A high-temperature tensile test at 980 °C was carried out to study the influence of various rates on the formation of the material’s microstructure and to further obtain the influence of different microstructures on the high-temperature mechanical properties of the materials. The results show that an increase of cooling rate resulted in a larger γ′ phase nucleation rate, formation of a smaller γ′ phase and a greater number. When air cooling was used, the uniformity of the γ′ phase and the coherence relationship between the γ′ phase and the γ phase were the best. At the same time, the test alloy had the best high-temperature tensile properties, and the material showed a certain degree of plasticity. TEM test results showed that the test alloy mainly blocked dislocations from traveling in the material through the strengthening effect of γ′, and that AC had the strongest hindering effect on γ′ dislocation movement.

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“…According to Wang [ 40 ] and Wu [ 41 ], the yield strength is positively related to the Vickers hardness for nickel-based superalloys:

…”

Section: Discussionmentioning

confidence: 99%

Effect of Nb on Microstructure and Mechanical Property of Novel Powder Metallurgy Superalloys during Long-Term Thermal Exposure

Zhou

Teng

et al. 2021

Materials

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Microstructure and mechanical properties of novel Ni-20Co-12Cr superalloys, with and without Nb addition, were systematically studied during long-term thermal exposure. With increased exposure time, the average diameter of the γ′ precipitates increased in both alloys in succession; this is more obviously observed in alloy containing 1 wt% Nb (1Nb). It is suggested that Nb increased the γ′ coarsening rate by accelerating the diffusion of Al and Nb in γ matrix. In addition, the γ′ phase fraction is increased by about 4% in 1Nb compared to the alloy without Nb (0Nb). The morphology of the γ′ phase changed from near-spherical to cuboidal shape during exposure in both alloys. Due to the increased γ/γ′ lattice misfit by Nb addition, 1Nb alloy showed an earlier tendency of shape change. Vickers hardness results revealed that the overall hardness decreased with the exposure time because the size increment of the γ′ precipitate weakened the precipitates strengthening and Orowan strengthening.

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Effect of heat treatment on mechanical property and microstructure of a powder metallurgy nickel-based superalloy

Cited by 35 publications

References 41 publications

Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

The Effect of the Cooling Rates on the Microstructure and High-Temperature Mechanical Properties of a Nickel-Based Single Crystal Superalloy

Effect of Nb on Microstructure and Mechanical Property of Novel Powder Metallurgy Superalloys during Long-Term Thermal Exposure

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