A physically-based model considering dislocation–solute atom dynamic interactions for a nickel-based superalloy at intermediate temperatures

Lin, Y.C.; Yang, Hui; He, Dao‐Guang; Chen, Jian

doi:10.1016/j.matdes.2019.108122

Cited by 55 publications

(19 citation statements)

References 61 publications

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“…The former component is induced by long-range barriers to dislocation motion and is independent of deformation conditions. In contrast, the latter component is caused by short-range barriers to dislocation motion such as the interactions of dislocations and crystal defects, and can be overcome by thermal activation process [13] . The two components are multiplied by a parameter E ( T )/ E 0 to represent the temperature dependence of Young's modulus.…”

Section: The Extended R-k Constitutive Equationmentioning

confidence: 99%

“…The effect of strain rate on the deformation behavior of 304 ASS can be explained in two strain regimes: at the initial stage of deformation, the constitutive behavior of 304 ASS is dominated by dislocation slip. The flow stress increases with increasing strain rate as the time available for a dislocation to wait in front of an obstacle for the additional thermal energy is reduced [8,13] . However, when it comes to large strains, the strengthening effect originated from SIMT is inhibited by adiabatic heating, and the corresponding strain hardening rate decreases.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-viscoplastic behavior of 304 austenitic stainless steel at various strain rates and temperatures: Testing, modeling and validation

Jia

Rusinek

Pesci

et al. 2020

International Journal of Mechanical Sciences

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This paper presents a systematic study of the thermo-viscoplastic behavior of a 304 austenitic stainless steel (ASS). The experiments were conducted over a wide range of strain rates (10 − 3 s − 1 to 3270 s − 1) and temperatures (-163°C to 172°C), for which the deformation behavior of 304 ASS becomes more complex due to the straininduced martensitic transformation (SIMT) effect. Dynamic tests at low/elevated temperatures were conducted using the Hopkinson technique coupled with a cooling device/heating furnace, and temperature distribution within the specimen was verified to be uniform. Experimental results showed that the strain hardening rate of 304 ASS was strongly affected by SIMT effect. For quasi-static tests (10 − 3 s − 1 to 1 s − 1) at low temperatures (-163°C to-20°C), the stress-strain relations exhibited an S-shape and a second strain hardening phenomenon. The strain rate sensitivity and temperature sensitivity of 304 ASS were also different from metallic materials deformed by dislocation glide. Several unexpected phenomena including the negative strain rate sensitivity and the changing temperature sensitivity from quasi-static to dynamic tests were observed. Based on experimental results, an extension of the Rusinek-Klepaczko (RK) model considering SIMT effect was used to simulate the deformation behavior of 304 ASS: it predicted flow stress curves of 304 ASS above-60°C correctly. In addition, to validate the extended RK model and the identified model parameters, numerical simulations of ballistic impact tests of 304 ASS plates at various temperatures were carried out, showing a good agreement with experiments.

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Section: The Extended R-k Constitutive Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermo-viscoplastic behavior of 304 austenitic stainless steel at various strain rates and temperatures: Testing, modeling and validation

Jia

Rusinek

Pesci

et al. 2020

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

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“…The dynamic interactions between the mobile dislocations and solute atoms lead to the short-range barriers of dislocation movements to accumulate elastic strain energy. [30] The accumulated elastic strain energy is sufficient to overcome the interfacial adhesion between the second-phase particles (γ 0 phase and carbide) and the matrix to form a new surface that will develop voids when the dislocation loop moves toward the γ 0 phase and the carbide. [31] The formation of voids also greatly reduces the repulsive force of the subsequent dislocations, so a large number of dislocations move toward the new microscopic cavity, causing it to grow.…”

Section: Fracture Analysismentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

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The influences of the size and shape of the γ 0 phase and the type and distribution of carbides on the fracture behavior of a new Ni-Cr-Fe superalloy subjected to four different solution aging treatments are examined. The γ 0 phase and γ matrix of the L1 2-ordered structure maintain a coherent orientation relationship on the {100} and {110} atomic planes according to transmission electron microscopy observations. The material becomes stronger because the movement of dislocations is hindered by the γ 0 phase and MC (Nb-rich, Ti-rich) and M 23 C 6 (Cr-rich, Mo-rich) carbides. The two-stage aging system (850 C Â 4 h þ 730 C Â 4 h) substantially increases the size of the γ 0 phase. The solid solution sample shows a microporous-aggregated ductile fracture, and the solution-aged samples show a microporous-aggregated crystalline fracture according to scanning electron microscopy observations. The fracture mechanism is also discussed.

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“…Because of the low density, marvelous corrosion resistance, and high strengths, titanium alloys are extensively used in some important parts of the aerospace industry, such as aircraft landing gears and compressor discs . Usually, the microstructures and mechanical properties of titanium alloys can be effectively regulated by heat treatments, as well as thermomechanical processing .…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Secondary Phase and Phase Transformation Behavior of a Solution‐Treated Ti–6Al–4V Alloy during High‐Temperature Aging

et al. 2020

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The precipitation of secondary phase and phase transformation behavior of a solution-treated Ti-6Al-4V alloy during aging heat treatment are investigated. The content, size of the equiaxed α phase, and the thickness of secondary phase are greatly influenced by the aging temperature. With the increased aging temperature, the mean grain size of the equiaxed α phase significantly decreases, whereas the precipitation process of the secondary phase is accelerated. Furthermore, during aging heat treatment, the precipitation and growth of the secondary phase not only destroy the initial lamellar α phase, but also connect with the equiaxed α phase to form a new curved lamellar α phase. In addition, it is found that the α 0 phase is precipitated, and the α 0 !α þ β phase transition occurs with the increased aging temperature.

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A physically-based model considering dislocation–solute atom dynamic interactions for a nickel-based superalloy at intermediate temperatures

Cited by 55 publications

References 61 publications

Thermo-viscoplastic behavior of 304 austenitic stainless steel at various strain rates and temperatures: Testing, modeling and validation

Thermo-viscoplastic behavior of 304 austenitic stainless steel at various strain rates and temperatures: Testing, modeling and validation

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

Precipitation of Secondary Phase and Phase Transformation Behavior of a Solution‐Treated Ti–6Al–4V Alloy during High‐Temperature Aging

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