Hot deformation behavior and processing map of a Sn0.5CoCrFeMnNi high entropy alloy with dual phases

Jeong, Hyein; Park, H.K.; Kim, Woo Jin

doi:10.1016/j.msea.2020.140394

Cited by 33 publications

(5 citation statements)

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“…Under RT, in stage I, the stress increases with an increase in the strain below the yield strength. Stage II is defined between the yield and tensile strength described by a long, stable hardening behavior due to the multiplication of dislocations [28,29]. The necking behavior is active after the yield strength due to the balance of the plastic deformation.…”

Section: Initial Microstructure Characterizationsmentioning

confidence: 99%

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Cai

Wang

et al. 2022

Materials

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To reduce harmful gas emission and improve the operational efficiency, advanced ultra-supercritical power plants put forward higher requirements on the high temperature mechanical properties of applied materials. In this paper, the tensile behavior and deformation mechanisms of MarBN steel are discussed at different strain rates (5 × 10−3 s−1, 5 × 10−4 s−1, and 5 × 10−5 s−1) under room temperature and 630 °C. The results show that the tensile behavior of the alloy is dependent on temperature and strain rate, which derived from the balance between the average dislocation velocity and dislocation density. Furthermore, observed dynamic recrystallized grains under severe deformation reveal the existence of dynamic recovery at 630 °C, which increases the elongation compared to room temperature. Finally, three typical constitutive equations are used to quantitatively describe the tensile deformation behavior of MarBN steel under different strain rates and temperatures. Meanwhile, the constitutive model of flow stress for MarBN steel is developed based on the hyperbolic sine law.

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Section: Initial Microstructure Characterizationsmentioning

confidence: 99%

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Cai

Wang

et al. 2022

Materials

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“…However, these studies offer only a limited in-depth analysis in terms of the evolution of microstructures without encompassing all the deterministic domains of the processing maps. There are only a few studies available in the literature on the hot workability of HEAs correlating the detailed microstructural features of each domain/ regime of the processing map, such as in the cases of CoCrFeMnNi [29], FeCrCuNi 2 Mn 2 [28], Sn 0.5 CoCrFeMnNi [31], Al 0.7 CoCrFeNi [18] and MoNbHfZrTi [32] HEAs, etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Patnamsetty

Ghosh

Somani

et al. 2022

Journal of Alloys and Compounds

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“…The functional relationship among the parameters and the objective function was established using the response surface method, and then GA was used to identify the parameters of the constitutive model [ 43 ]. Firstly, an initial value was assigned to each parameter.…”

Section: Resultsmentioning

confidence: 99%

Constitutive Model Parameter Identification Based on Optimization Method and Formability Analysis for Ti6Al4V Alloy

Chen

Zhang

et al. 2022

Materials

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Titanium alloy is widely applied in aerospace, medical, shipping and other fields due to its high specific strength and low density. The purpose of this study was to analyze the formability of Ti6Al4V alloys at elevated temperatures. An accurate constitutive model is the basic condition for accurately simulating the plastic forming of materials, and it is an important basis for optimizing the parameters of the hot forging forming process. In this study, the optimization algorithm was used to accurately identify the high-temperature constitutive model parameters of Ti6Al4V titanium alloy, and the hot working diagram was established to optimize the hot forming process parameters. The optimal forming conditions of Ti6Al4V titanium alloy are given. Ti6Al4V alloy was subjected to high-temperature compression tests at 800–1000 °C and at strain rates of 0.01–5 s−1 on a Gleeble-1500D thermal/mechanical simulation machine. Each parameter of the Hansel–Spittel constitutive model was taken as an independent variable, and the accumulated error between the stress calculated by the constitutive model and the stress obtained by experimentation was used as an objective function. Based on response surface methodology, an inverse optimization method for identifying the parameters of the high-temperature constitutive model of Ti6Al4V alloy is proposed in this paper. An orthogonal test design was adopted to obtain sample point data, and a third-order response surface approximate model was established. The genetic algorithm (GA) was applied to reversely optimize the parameters of the constitutive model. To verify the accuracy of the optimized constitutive model, the average absolute relative error (AARE) and correlation coefficient (R) were used to evaluate the reliability of optimized constitutive model. The R value of the model was 0.999, and the AARE value was 0.048, respectively, indicating that the established high-temperature constitutive model for Ti6Al4V alloy has good calculation accuracy. The flow stress behavior of the material could be accurately delineated. Meanwhile, in order to study the formability of Ti6Al4V alloy, the hot processing map of the alloy, based on a dynamic material model, was established in this paper. The optimum hot working domains of the Ti6Al4V alloy were determined within 840–920 °C/0.01–0.049 s−1 and 940–980 °C/0.11–1.65 s−1; the hot processing map was verified in combination with the microstructure, and the fine and equiaxed grains and a large amount of β phase could be found at 850 °C/0.01 s−1.

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Hot deformation behavior and processing map of a Sn0.5CoCrFeMnNi high entropy alloy with dual phases

Cited by 33 publications

References 50 publications

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Tensile Behavior, Constitutive Model, and Deformation Mechanisms of MarBN Steel at Various Temperatures and Strain Rates

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

Constitutive Model Parameter Identification Based on Optimization Method and Formability Analysis for Ti6Al4V Alloy

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