Dynamic recrystallization behavior and processing maps of 5CrNiMoV steel during hot deformation

Li, Qin; Bu, Hengyong; Han, Jiuyan; Mengnie, Li

doi:10.1088/2053-1591/acce22

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…Recently, some studies investigated the microstructure changes in alloys during hot deformation [ 16 , 17 , 18 , 19 ]. For example, the nucleation and coarsening features of dynamic recrystallization (DRX) were explored in numerous investigations [ 20 , 21 ], and multiple kinetic models were proposed for describing the DRX features of Ni-based superalloys, i.e., Hastelloy C276 alloy [ 22 ] and GH4169 alloy [ 23 ]. Moreover, the evolution mechanisms of substructures, including the dislocation clusters/loops and subgrains were explored, which impacted the DRX behaviors of Ni-based superalloys [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of Hastelloy C276 Alloy: Microstructural Variation and Constitutive Models

He,

Chen,

Lin

et al. 2023

Materials

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Isothermal deformation experiments of the Hastelloy C276 alloy were executed using the Gleeble-3500 hot simulator at a temperature range of 1000–1150 °C and a strain rate range of 0.01–10 s−1. Microstructural evolution mechanisms were analyzed via transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). Results reveal that the influences of hot compression parameters on the microstructure variation features and flow behaviors of the Hastelloy C276 alloy were significant. The intense strain hardening (SH) effects caused by the accumulation of substructures were promoted when the strain rates were increased, and true stresses exhibited a notable increasing tendency. However, the apparent DRV effects caused by the annihilation of substructures and the increasingly dynamic recrystallization (DRX) behaviors occurred at high compressed temperature, inducing the reduction in true stresses. In addition, a physical-based (PB) constitutive model and a long short-term memory (LSTM) model optimized using the particle swarm optimization (PSO) algorithm were established to predict the flow behavior of Hastelloy C276 alloy. The smaller average absolute relative error and greater relation coefficient suggest that the LSTM model possesses a higher forecasting accuracy than the PB model.

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Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of Hastelloy C276 Alloy: Microstructural Variation and Constitutive Models

He,

Chen,

Lin

et al. 2023

Materials

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Investigating Optimum Hot Working Window of 2205 Duplex Stainless Steel Using Modified Dynamic Material Modeling

Gonya,

Makhatha,

Siyasiya

et al. 2024

J. of Materi Eng and Perform

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This paper uses a modified dynamic material modeling (MDMM) suggested by Murty and Rao to develop processing maps (PM) of 2205 duplex stainless steels (DSS). Gleeble 1500D, a thermo-mechanical simulator was used to conduct single hit compression tests at a temperature between 850 and 1050 °C and strain rates of 0.001-5 s−1. Additionally hot compression tests at a strain rate of 15 s−1 and same temperature range were also conducted on a Bahr 805 dilatometer. As per general procedure acquired stress-strain data were corrected for friction and adiabatic heating, before constructing PMs at true strains of 0.1, 0.3, 0.5 and 0.8. Microstructures to validate the PM were prepared from safe domains and instability regimes belonging to PM of 0.8 true strain. Results showed that hot processing at intermediate to high strain rates and temperature leads to formation of flow instabilities such as mechanical twins and adiabatic shear bands. Safe domain located within the temperature range of (850-925) °C, strain rates of (2.6-15) s−1 and peak η = 35% gave an inhomogeneous microstructure with presumably non-uniform mechanical properties. This region was considered ideal for hot processing of 2205 DSS provided that deformation conditions are carefully controlled to optimise DRX. Low Z conditions also provided an optimum hot working for hot processing.

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Application of processing maps and numerical modelling for identification of parameters and limitations of hot forging process of 80MnSi8-6 steel

Wojtaszek,

Lisiecki,

Łukaszek-Sołek

et al. 2023

Archiv.Civ.Mech.Eng

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The processing maps developed by dynamic material modelling (DMM) method are now widely used in the design of hot forming processes. However, this applies to those processes that are relatively fast or are carried out under isothermal conditions, when it is possible to maintain the deformation parameters within the processing window. In the case of multi-stage free forging, the temperature successively decreases during subsequent operations and is increased during inter-process reheating. Under such conditions, processing maps in direct form are not applicable. The proposed solution is to implement the data obtained by the DMM method into calculations carried out by the finite element method (FEM). This approach leads to obtain the distributions of DMM parameters in the volume of the feedstock at successive forging stages. Selected results of a combined DMM/FEM analysis of a multi-stage hot forging process of 80MnSi8-6 steel are presented. The starting data for the analysis were the flow curves of this material, determined from compression tests. The processing maps were developed and processing windows were determined. The results of the DMM analysis were verified by microstructure observations. Data from the DMM analysis were implemented into QForm software using LUA scripts. An integrated FEM/DMM numerical analysis of the process of a multi-step hot free forging of an example product was performed. The geometry of the tools and a sequence of operations were developed. The distributions of the DMM parameters and the hot deformation activation energy in the forging volume after successive forging sequences were analyzed.

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Dynamic recrystallization behavior and processing maps of 5CrNiMoV steel during hot deformation

Cited by 3 publications

References 39 publications

Hot Deformation Behavior of Hastelloy C276 Alloy: Microstructural Variation and Constitutive Models

Hot Deformation Behavior of Hastelloy C276 Alloy: Microstructural Variation and Constitutive Models

Investigating Optimum Hot Working Window of 2205 Duplex Stainless Steel Using Modified Dynamic Material Modeling

Application of processing maps and numerical modelling for identification of parameters and limitations of hot forging process of 80MnSi8-6 steel

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