Spheroidization and dynamic recrystallization mechanisms of a novel HIPed P/M superalloy during hot deformation

Yang, Qiu-Mei; Lin, Y.C.; Guo, Jianzheng; Wang, Chao; Chen, Zijian; Chen, Kai-Ge; Zhu, Jiang

doi:10.1016/j.jallcom.2022.164909

Cited by 36 publications

(10 citation statements)

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“…To investigate the DRX behavior and the grain dimension in the hot-compression process, electron back-scattered diffraction (EBSD, JEOL-7001F1 FE-SEM) was applied to observe the deformed microstructures. The method of preparing EBSD samples has been reported in detail in our previous study, i.e., the samples were mechanically polished and then electrolytically polished by a solution of 10 mL HClO 4 and 90 mL CH 3 CH 2 OH at a temperature of −31 to −26 °C as well as a voltage of 23 V [ 28 ]. The EBSD test was performed at an acceleration voltage of 25 kV, step size of 0.5 μm, and a scanning area of 100 μm × 100 μm.…”

Section: Materials and Experiments Proceduresmentioning

confidence: 99%

“… GOS maps of the HIPed superalloy deformed at the true strain of ( a ) 0.22; ( b ) 0.51; ( c ) 0.92 [ 28 ]; ( d ) the local misorientation angle; ( e ) average grain size distribution; ( f ) area fraction of DRX (HAGBs and LAGBs correspond to the black line and gray line, respectively. The temperature and strain rate are 1110 °C and 0.1 s −1 , respectively).…”

Section: Figurementioning

confidence: 99%

“… GOS maps of the HIPed superalloy deformed at a strain rate of ( a ) 0.001 s −1 ; ( b ) 0.01 s −1 ; ( c ) 0.1 s −1 [ 28 ]; ( d ) local misorientation angle; ( e ) average grain size distribution; ( f ) area fraction of DRX (the temperature and true strain are 1140 °C and 0.92, respectively). …”

Section: Figurementioning

confidence: 99%

“… GOS maps of the HIPed superalloy deformed at temperatures of ( a ) 1080 °C; ( b ) 1110 °C [ 28 ]; ( c ) 1120 °C; ( d ) 1140 °C; ( e ) 1170 °C; ( f ) the local misorientation angle; ( g ) average grain size distribution; ( h ) area fraction of DRX (the strain rate is 1 s −1 and true strain is 0.92). …”

Section: Figurementioning

confidence: 99%

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Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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The dynamic recrystallization (DRX) features and the evolution of the microstructure of a new hot isostatic pressed (HIPed) powder metallurgy (P/M) superalloy are investigated by hot-compression tests. The sensitivity of grain dimension and DRX behavior to deformation parameters is analyzed. The results reveal that the DRX features and grain-growth behavior are significantly affected by deformation conditions. The DRX process is promoted with a raised temperature/true strain or a reduced strain rate. However, the grains grow up rapidly at relatively high temperatures. At strain rates of o.1 s−1 and 1 s−1, a uniform microstructure and small grains are obtained. Due to the obvious differences in the DRX rate at various temperatures, the piecewise DRX kinetics equations are proposed to predict the DRX behavior. At the same time, a mathematical model for predicting the grain dimension and the grain growth behavior is established. To further analyze the DRX behavior and the changes in grain dimension, the hot deformation process is simulated. The developed grain-growth equation as well as the piecewise DRX kinetics equations are integrated into DEFORM software. The simulated DRX features are consistent with the test results, indicating that the proposed DRX kinetics equations and the established grain-growth model can be well used for describing the microstructure evolution. So, they are very useful for the practical hot forming of P/M superalloy parts.

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Section: Materials and Experiments Proceduresmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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“…Hot deformation significantly changed the initial microstructure of the cast ingots by eliminating the casting defects and refining grains by dynamic recrystallization [ 8 ]. However, the optimization of the hot deformation conditions is necessary to obtain the required microstructure and subsequently good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Prediction of True Stress at Hot Deformation of High Manganese Steel by Artificial Neural Network Modeling

Churyumov

Kazakova

2023

Materials

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The development of new lightweight materials is required for the automotive industry to reduce the impact of carbon dioxide emissions on the environment. The lightweight, high-manganese steels are the prospective alloys for this purpose. Hot deformation is one of the stages of the production of steel. Hot deformation behavior is mainly determined by chemical composition and thermomechanical parameters. In the paper, an artificial neural network (ANN) model with high accuracy was constructed to describe the high Mn steel deformation behavior in dependence on the concentration of the alloying elements (C, Mn, Si, and Al), the deformation temperature, the strain rate, and the strain. The approval compression tests of the Fe–28Mn–8Al–1C were made at temperatures of 900–1150 °C and strain rates of 0.1–10 s−1 with an application of the Gleeble 3800 thermomechanical simulator. The ANN-based model showed high accuracy, and the low average relative error of calculation for both training (5.4%) and verification (7.5%) datasets supports the high accuracy of the built model. The hot deformation effective activation energy values for predicted (401 ± 5 kJ/mol) and experimental data (385 ± 22 kJ/mol) are in satisfactory accordance, which allows applying the model for the hot deformation analysis of the high-Mn steels with different concentrations of the main alloying elements.

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Hot Deformation Behavior and 3D Processing Maps of Mn18Cr18N Steel

Zhang

Cen

Wang

et al. 2022

steel research int.

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The isothermal hot deformation behavior in the ranges of 1023–1473 K (750–1200 °C) and 0.001–10 s−1 for 0.53 wt% N‐bearing Mn18Cr18N steel is studied with a Gleeble‐3500 thermomechanical simulator. The results indicate that the peak stress decreases with decreasing strain rate and increasing temperature. The calculated deformation activation energy of the experimental steel is 449.118 kJ mol−1 by regression analysis. At the same time, 3D processing maps are established based on experimental data and the principles of the dynamic materials model. The domain of stable deformation gradually expands with the increase in strain, while the instability region shrinks accordingly. From the microstructure of specimens and the processing maps established, it is clear that dynamic recrystallization emerges in the peak power dissipation efficiency domain, 1000–1150 °C/0.002–0.1 s−1, which is the optimum region of hot working of the steel.

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Spheroidization and dynamic recrystallization mechanisms of a novel HIPed P/M superalloy during hot deformation

Cited by 36 publications

References 58 publications

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

Prediction of True Stress at Hot Deformation of High Manganese Steel by Artificial Neural Network Modeling

Hot Deformation Behavior and 3D Processing Maps of Mn18Cr18N Steel

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