The tensile behavior of GH3535 superalloy at elevated temperature

Han, Fenfen; Zhou, Bomou; Huang, Huijie; Leng, Bin; Lu, Yuan-Ming; Dong, Jianshu; Li, Z.J.; Zhou, Xingtai

doi:10.1016/j.matchemphys.2016.07.001

Cited by 64 publications

(12 citation statements)

References 28 publications

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“…An anomaly is also present in this case at temperatures near to 600 • C, where a significant decrease in the elongation occurs. This anomalous behavior in the tensile properties at temperatures close to 600 • C was also evidenced by other authors [4,5,[13][14][15][16][17][18][19][20] and depends on the strain rate applied in the test. According to these researches, at a strain rate less than 10 −5 s −1 , this anomalous behavior is no longer observed, resulting in a constant drop in the yield strength and a constant ductility increase with the tensile test temperature increase.…”

Section: Tensile Testssupporting

confidence: 82%

“…There were no significant differences in the mechanical properties results due to the variation of the strain rates applied. However, smaller strain rates were not tested, nor was the strain rate variation tested at other temperatures, making it impossible to compare the work of the authors mentioned above [4,5,[13][14][15][16][17][18][19][20]. The stress-strain curves obtained in the tensile tests at room temperature up to 1000 °C are shown in Figure 3.…”

Section: Tensile Testsmentioning

confidence: 99%

“…Hale et al [14] have associated the serration flow behavior in Ni-based superalloys at lower temperatures to the interstitial solute diffusion, such as that of carbon, and at higher temperatures, the substitutional atoms diffusion, such as that of molybdenum and chromium. [4,6,23]. Cottrell [22] was the first to suggest the dislocation-solute atom interaction model.…”

Section: Tensile Testsmentioning

confidence: 99%

“…Inconel 625 exhibits unstable plastic flow at elevated temperatures characterized by serrated yielding, well-known as Portevin-Le Chatelier (PLC) effect. This phenomenon is usually attributed to the dynamic strain ageing (DSA) [4][5][6][7]. The PLC effect is observed in many nickel-based superalloys within a certain range of deformation temperature and strain rate [8].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Inconel 625 at Elevated Temperatures

Oliveira

Couto

Almeida

et al. 2019

Metals

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Inconel 625 is a nickel-based alloy that is mainly used in high-temperature applications. Inconel 625 exhibits an unstable plastic flow at elevated temperatures characterized by serrated yielding, well-known as the Portevin-Le Chatelier effect. The evaluation of the mechanical properties of Inconel 625 at high temperatures is the aim of this work. The tensile tests were executed in temperatures ranging from room temperature to 1000 °C with strain rates of 2 × 10−4 to 2 × 10−3 s−1. The creep tests were executed in the temperature range of 600–700 °C and in the stress range of 500–600 MPa in a constant load mode. The optical and scanning electron microscopes were used for surface fracture observation. In the curves obtained at 200–700 °C the serrated stress-strain behavior was observed, which was related to the dynamic strain aging effect. The yield strength and the elongation values show anomalous behavior as a function of the test temperature. An intergranular cracking was observed for a specimen tensile tested at 500 °C that can be attributed to the decohesion of the carbides along the grain boundaries. The fracture surface of the specimen tensile tested at 700 °C showed the predominance of transgranular cracking with tear dimples with a parabolic shape.

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Section: Tensile Testssupporting

confidence: 82%

Section: Tensile Testsmentioning

confidence: 99%

Section: Tensile Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Behavior of Inconel 625 at Elevated Temperatures

Oliveira

Couto

Almeida

et al. 2019

Metals

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show abstract

“…Ten tons of ingot of alloy have been successfully manufactured, whose mechanical performance and corrosion resistance are as good as the Hastelloy-N alloy. [56][57][58][59] The ultrafine grain nuclear graphite specific for MSR has been successfully developed, and difficulties have been dealt with in the scaleup process. The performances of this type of nuclear graphite, including the mechanical performance, thermodynamic, purity, and uniformity, meets the requirements of MSR.…”

Section: Structural Materials Researchmentioning

confidence: 99%

Review of conceptual design and fundamental research of molten salt reactors in China

Zhang

Liu

et al. 2018

Int J Energy Res

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Summary Molten salt reactor (MSR) as 1 candidate of the generation IV advanced nuclear power systems attracted more attention in China due to its top ranked in fuel cycle and thorium utilization. Two types of MSR concepts were studied and developed in parallel, namely the MSR with liquid fuel and that with solid fuel. Abundant fundamental research including the neutronics modeling, thermal‐hydraulics modeling, safety analysis, material investigation, molten salts technologies etc. were carried out. Some analysis software such as COUPLE and FANCY were developed. Several experimental facilities like high‐temperature fluoride salt experiment loop have been constructed. Some passive residual heat removal systems were designed, and 1 test facility is under construction. The key MSR techniques including the extraction and separation of molten salt and construction of N‐base alloy have been mastered. Based on these fundamental research, Chinese Academy of Sciences has completed the design of thorium‐based MSRs with solid fuel and liquid fuel and is promoting their construction in the near future. In China, future efforts should be paid to the material, online fuel processing, Th‐U fuel cycle, component design, and construction and thermal‐hydraulic experiments for MSR, which are rather challenging nowadays.

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Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

et al. 2018

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Effects of initial microstructures on the Portevin-Le Chatelier effect (PLC) and mechanical properties of a Ni-Fe-Cr-base superalloy are investigated by hot tensile deformation tests. The inverse PLC effect only occurs in the ST (solution treated) and SAT (solution plus δ phases aging precipitation) superalloys when the deformation temperature is above 873 K. Effects of initial microstructures on the temperature range of PLC effect are obvious, that is, the narrowest temperature range for the HS (solution plus γ 0 /γ 00 phases aging precipitation) superalloy, while the widest temperature range for the ST superalloy. The average activation energy for type A/AþB/B serrations can be determined as 65-81 kJ mol À1 , which contributes to the migration of carbon atoms through pipe diffusion. Meanwhile, the average activation energy for type C serration is about 132-175 kJ mol À1 , which is induced by the pipe diffusion of substitutional atoms. An obvious increase in the yield strength with increasing the deformation temperature from 900 to 973 K is observed for the ST and SAT superalloys. Also, the negative strain rate sensitivity is found in the PLC effect regime. The ST and HS superalloys exhibit the ductile fracture. However, a mixture of ductile transgranular and cleavage fracture is observed in the SAT superalloy.

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The tensile behavior of GH3535 superalloy at elevated temperature

Cited by 64 publications

References 28 publications

Mechanical Behavior of Inconel 625 at Elevated Temperatures

Mechanical Behavior of Inconel 625 at Elevated Temperatures

Review of conceptual design and fundamental research of molten salt reactors in China

Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

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