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Article
Materials Science, Multidisciplinary
Haizhu Li et al.
Summary: Microstructures of GH4698 alloy under hot compression and solution annealing were characterized, focusing on grain boundary character distributions (GBCDs). The generation and growth of twins during annealing were studied to assess the suitability of optimized GBCDs in Ni-based superalloys. The processing parameters influenced the grain size and twin boundaries significantly. Coupling hot compression at small strain and prolonged solution treatment at low temperature resulted in optimized GBCD, with high values of N-Ave and R, indicating a high proportion of Sigma 3(n) boundaries.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Xiaomin Chen et al.
Summary: Hot tensile tests were conducted on a Mg-9.1Y-1.8Zn alloy to study its microstructural evolution and fracture damage. The results showed that the flow stress decreased with increasing temperature and decreasing strain rate. The formation of discontinuous dynamic recrystallization (DDRX) and particle-stimulated nucleation (PSN) induced by LPSO were crucial mechanisms for deformation and fracture. The fracture mechanism changed from intergranular to transcrystalline at temperatures above 250 degrees C, while the effects of strain rate were less significant.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Yulong Zhu et al.
Summary: This study investigated the hot deformation behavior of Alloy 925 through isothermal hot compression tests in different temperature and strain rate ranges. The stress distribution in three-dimensional space was reconstructed using an artificial neural network model. 3D distribution maps of strain rate sensitivity and power dissipation efficiency were proposed, and a novel 3D processing map was established. Microstructural characterization revealed differences between stable and unstable regions, and the optimal processing parameters were determined.
Article
Chemistry, Physical
Liqun Niu et al.
Summary: The study conducted isothermal compression tests on different microstructures in the cogging process of Ti-6Al-4V, calibrated constitutive equations, and proposed a modified equation considering microstructural evolution. The modified equation showed improved prediction accuracy compared to original formulations, making it more suitable for simulating the cogging process effectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Bing Sun et al.
Summary: The flow behavior and dynamic recrystallization of a powder metallurgy EP962NP nickel-based superalloy in the (gamma + gamma')-phase region have been investigated, showing typical characteristics of dynamic recrystallization behavior and discontinuous dynamic recrystallization mechanism with prevalent observation of necklace structures. The refined recrystallized gamma grains can be obtained with a higher strain rate, and primary gamma' morphology transforms from micron-scale irregular blocks to nano-scale spherical precipitates via dissolution and re-precipitation process during hot compression.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Haizhu Li et al.
Summary: The microstructure evolution of GH4698 nickel-based superalloy was studied under different temperature, strain rate, and strain conditions. The study revealed the effects of temperature and strain rate on dynamic recrystallization, and identified three different mechanisms involved in the process.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xuejian Lin et al.
Summary: The hot compression test of a Ti-47.5Al-2.5 V-1.0Cr-0.2Zr alloy was conducted to establish hot processing maps and determine optimal thermal processing parameters and instability regions. Different microstructures were observed in various regions of the processing maps, with the microstructures in the optimal hot working condition showing better characteristics than those in the instability region. The study demonstrated the authenticity of the thermal processing safety region and the instructive role of the processing map in choosing thermal processing parameters.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Hui Zhu et al.
Summary: This study uses the ZOP model and its modifications to predict the hot deformation behaviors of metallic materials, with the validity of these models demonstrated using experimental data of 42CrMo. The Modified model III provides the most accurate prediction for flow stress, and these models can effectively predict the occurrence and completion of dynamic recrystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Chemical
Chao Ni et al.
Summary: A novel process combining high-speed shear flocculation and flotation was proposed to beneficiate ultra fine microcrystalline graphite. The flotation rate of MG in the SFF process is about 3 times as fast as that in the conventional flotation process, due to the increase in aggregate size and improved hydrophobicity of graphite particles. The SFF process shows great potential in industrial applications for separating ultrafine MG.
Article
Automation & Control Systems
Jiyu Li et al.
Summary: The optimal forging parameters for cast Mg-9.0Gd-3.0Y-2.0Zn-0.5Zr alloy were determined using 3D processing maps and finite element analysis, resulting in the production of a large forged part with consistent properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yunlong Hu et al.
Summary: This study investigates the plastic behaviors and dynamic recrystallization mechanisms of as-deposited nickel-based superalloy. The results show that as-deposited Inconel 625 has lower hot deformation activation energy compared to wrought Inconel 625. The study also identifies the best hot working conditions for as-deposited Inconel 625 through microstructural evolution and hot processing map analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuejian Lin et al.
Summary: The hot deformation behavior of a Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy was investigated through thermal simulation experiments. A constitutive equation was established to describe the relationship between stress, strain rate, and temperature, and the predicted stress curve was consistent with the experimental results. The processing map identified the optimum hot deformation parameters, and the dominant deformation mechanisms of the TiAl alloy were DRX, dislocation movement, and twins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Caiyi Liu et al.
Summary: This paper investigates the coupled behaviors of dynamic recrystallization (DRX) hot deformation parameters in metallic materials and proposes a new DRX model to predict the DRX volume fraction. Electron backscattering diffraction (EBSD) is used to characterize the microstructural morphology.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jeyong Yu et al.
Summary: The study analyzed the effect of activation energy on stress-strain curves by conducting uniaxial compression tests and establishing constitutive modeling based on Zener-Hollomon parameters. Different models were compared for flow stresses and their accuracies were evaluated using average absolute relative error, followed by modeling of dynamic recrystallization behavior. The prediction of material microstructure was successfully achieved.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yikui Xie et al.
Summary: This study investigated the isothermal single-pass forming deformation of forged 18CrNiMo7-6 alloy steel using a Gleeble-3500 thermal simulation testing machine. Constitutive equations and processing maps were established based on the deformation temperature and strain rate. The results showed that the optimal hot deformation parameters were a temperature of 1050 degrees C and a strain rate of 0.1 s(-1), with a peak power efficiency of 0.432. The grain refinement mechanism during hot compression was characterized by electron backscatter diffraction (EBSD), which revealed that continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), and grain growth were the main microstructure evolution mechanisms during hot working.
Review
Materials Science, Multidisciplinary
Hamed Aghajani Derazkola et al.
Summary: This review paper presents the latest developments in the numerical analysis, microstructural simulation, and artificial intelligence methods for the hot deformation process of martensitic stainless steels (MSS). Modeling and simulation analysis can reduce the number of experiments and provide insights into the effects of strain and strain rate variations in manufacturing processes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Anjin Liu et al.
Summary: The hot deformation behavior and microstructure evolution of newly developed as-cast high-density steel were investigated. The steel exhibited higher activation energy and an increase in the degree of dynamic recrystallization with increasing temperature and decreasing strain rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Dao-chun Hu et al.
Summary: The hot deformation behavior of TA32 titanium alloy was studied and a BP-ANN model was developed to predict the flow stress and thermal processing maps. The model showed good accuracy in predicting flow stress and the optimal temperature and strain rate range for TA32 hot forming was determined.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Daoguang He et al.
Summary: In this study, the flow characteristics and microstructural changes of a Ni-Mo-Cr base alloy were researched through double-stages hot compression with step-strain rates. Electron backscatter diffraction and transmission electron microscopy were used to comprehend the influences of compressed parameters on the alloy. A physically-based constitutive model considering the evolution characteristics of dislocation density, subgrain, and grain structure was developed to forecast the hot compressed behaviors. The experimental results showed that the compressed temperature exacerbated dislocation consumption, subgrain rotation/interaction, and DRX grains coarsening, while the strain rates at the first or second stage of hot compression led to prominent dislocation accumulation, subgrain generation, and DRX grains refinement. The discontinuous DRX characterized by the bulging/serrated of grain boundaries was found to be the major DRX nucleation mechanism. The forecasted compressed stress, grain size, and DRX fraction matched well with the tested results, indicating that the constructed physically-based constitutive equations could effectively model the high-temperature features and microstructural changes of the studied alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Guanqiang Wang et al.
Summary: This research aims to clarify the connections between recrystallization and the delta (8) phase (Ni3Nb) during annealing in Ni-based alloys. The results show that the microstructure and component of the 8 phase dominate the recrystallization nucleation in the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. Kasaeian-Naeini et al.
Summary: The high-temperature deformation behavior of Mg/HA biocomposites was investigated using compression tests. The results showed that the proposed constitutive model accurately predicted the behavior of these materials. The study also revealed the activation energy and power dissipation efficiency of the biocomposites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Rong Kong et al.
Summary: The hot deformation behavior and microstructural evolution of Inconel 625 superalloy sheet under different conditions were investigated. The plastic flow behavior of the Inconel 625 sheet changes from work hardening to hot softening with the rise of experimental temperature and the decline of strain rate. The optimal hot working window appears at the temperature range of 925 and 950 degrees C and the strain rate between 0.001 and 0.1 s-1 with the power dissipation efficiency of about 46.5%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zonglin Chi et al.
Summary: This study investigates the failure behaviors of powder metallurgy (P/M) Ni-based superalloys using isothermal hot compression experiments and finite element analysis (FEA). The study constructs processing maps with failure domains based on predicted failure thresholds and demonstrates the strain-controlled failure mechanism. An optimized processing window for hot deformation is formulated to ensure good hot workability and avoid flow instability and failure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Baoyun Zhang et al.
Summary: This study deeply explores the microstructural origin and control mechanism of mixed grain structure and determines the optimum processing parameters through thermo-mechanical processing. The evolution of microstructure corresponding to the identified optimal parameters is systematically investigated. The study reveals that discontinuous dynamic recrystallization and continuous dynamic recrystallization mechanisms occur simultaneously, and the grain boundary bulging discontinuous dynamic recrystallization dominates the microstructure control.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Min Chen et al.
Summary: The study investigates the hot deformation behavior of A356 aluminum alloy through isothermal compression experiments, identifying differences in stress responses and microstructural features under various deformation conditions. A new enhanced Johnson-Cook model is proposed to accurately describe the experimental results.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
Rui Luo et al.
Summary: The thermal-mechanical experiments on a newly developed Fe-Cr-Ni-Al-Nb superalloy revealed that higher temperature, lower strain rate, and larger true strain were favorable for dynamic recrystallization. The study also identified three stages during dynamic recrystallization and three different mechanisms for the process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Dekai Liu et al.
Summary: The hot deformation behavior and microstructure evolution of the new NiAl-9%HfO2 composite were studied through hot compression tests, leading to the establishment of an Arrhenius constitutive model and development of processing maps. The optimal hot deformation processing window was identified, and detailed discussions on microstructure evolution and softening mechanism were conducted. The study also found that samples deformed at 1350 degrees C with a strain rate of 0.03 s(-1) exhibited the highest performance, indicating improvements in yield strength and ultimate compression deformation compared to the original samples.
Article
Materials Science, Multidisciplinary
Chengbin Shi et al.
Summary: The hot deformation and microstructure characteristics of a novel austenitic heat-resistant steel were studied through isothermal compression tests. A strain-compensated modified constitutive model and a kinetic model were established to accurately predict the flow behaviors and dynamic recrystallization volume fraction of the steel. It was found that the fraction and size of dynamic recrystallized grains varied with different deformation conditions, and the presence of fine NbC and Fe2Nb-type Laves phase particles hindered dynamic recrystallization. Hot processing maps were constructed to determine the optimal processing parameters for the steel.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Cuiyuan Lu et al.
Summary: This study investigated three physically based constitutive modeling approaches for Ti17 alloy in 1 forging, and analyzed their prediction accuracy and deformation/diffusion mechanisms. The results suggest that both lattice diffusion and grain boundary diffusion play roles in the alloy forging process.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Vitor Vieira Rielli et al.
Summary: Advancements in thermo-mechanical processing of Ni-based superalloys enable manufacturing of engineering parts with superior mechanical properties. Forged aeroengine disks exhibit radial microstructural heterogeneities from both pre-materials and prior processing, where localized meta-dynamic recrystallization and strain areas accelerate grain growth and precipitation of strengthening phases, while direct ageing successfully mitigates radial property heterogeneities. Strength after direct ageing is mainly provided by precipitation strengthening, with low impact from variations in grain boundary strengthening, work hardening, and solid solution strengthening.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Changmin Li et al.
Summary: The new metastable titanium alloy Ti-6Cr-5Mo-5V-4Al (Ti-6554) has shown good application potential in large parts. Through hot compression tests and the use of a strain-compensated Arrhenius constitutive model, the flow behavior of the alloy was predicted and characteristics of dynamic recrystallization were observed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yao Lu et al.
Summary: This study investigated the flow behavior and microstructure of Si-Cr spring steel under different compression conditions using a Gleeble 3500 facility. The results showed that the experimental steel underwent dynamic recrystallization with increasing compression temperature. A strain-compensated constitutive model was established and verified with good agreement between experimental and predicted points, indicating high reliability throughout the hot deformation process.
Article
Materials Science, Multidisciplinary
Xiaofei Chen et al.
Summary: The study investigated the dynamic recrystallization mechanism of the Ti-48Al-2Cr-2Nb alloy during thermal uniaxial compression experiments. It was found that both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) occurred in the gamma grains, with the crystal orientations of CDRX grains close to the (001) orientation at a strain of 0.92. The emergence of DRX in the gamma laths of lamellar colonies and the alpha 2 to gamma phase transformation were confirmed, and a new hot processing map based on DRX volume fraction was established to optimize the thermo-mechanical treatment of the TiAl alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Hui Zhu et al.
Summary: A new phenomenological constitutive model is proposed to predict the mechanical behavior of thermoplastics, showing favorable predictions for different phases of flow stress behavior. It demonstrates improved accuracy compared to other existing models in representing the mechanical behavior of thermoplastics under a wide range of deformation conditions.
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