Modelling on flow stress of plain carbon steel at elevated temperatures

Hatta, Natsuo; Kokado, Jun‐ichi; Kikuchi, Shiomi; Takuda, Hirohiko

doi:10.1002/srin.198500694

Cited by 30 publications

(9 citation statements)

References 8 publications

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“…There are several phenomenological models that establish the connection between the stressed and deformed state of the medium [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]:…”

Section: Formatting the Title Authors And Affiliationsmentioning

confidence: 99%

Developing of complex for hot plastic deformation modeling of steel type 20-30CrNiMoV for heavy forging

et al. 2017

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Abstract. Production of heavy forging of bars weighing more then 235 tons for such products as rotors made of steel type 20-30CrNiMoV is a critical independent work, failure to perform which entails high costs related to repeated production (in case of defective product) and untimely launch of production plants. One of the frequent causes of a defective product is the impossibility of ultrasonic testing in the barrel-gate zones on the rotor workpiece, which is due to the microstructure of the metal, namely the grain size. Determing the stages of deformation process wich causes such defects in structure is the main goal of this work. Formatting the title, authors and affiliationsDecrease of defective products at all processing stages of metallurgical production is a priority task for researchers and production engineers. As is known, the grain size under deformation depends on the following parameters: degree of deformation ε, rate of deformation ε̇ s -1 , temperature T. These physical parameters in turn are associated with the process parameters, such as tool operation time on the workpiece, T of metal on the surface. Prediction of the structure change at different degrees of deformation and at a certain temperature is described on the basis of the theory of plastic deformation and can be modeled for specific technological processes [1,2].In turn, during deformation, recrystallization always occurs, which can be of three types: static, metadynamic and dynamic. One of the ways to optimize production processes at the stage of hot plastic deformation (HPD) of ingots is to model the structure using mathematical models and the finite elements method.There are several phenomenological models that establish the connection between the stressed and deformed state of the medium [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]: Johnson-Cook model;  Steinberg-Cochran-Guinan-Lund model;  Zerilli-Armstrong model;  Mechanical threshold stress model (MTS);  Preston-Tonks-Wallace model. At the present time in order to model the evolution of structure during the HPD process, the microstructure characteristics relationship models (volume fraction of recrystallized grains and grain size) with HPD parameters based on equations of Avrami-Kolmogorov type [3][4][5][6][7][8] are most widely used. They show a high predictive capability, but require a lot of experimental data in order to determine unknown constants.Kinetics of dynamic recrystallization can be described by the following set of equations (1-4): 10 0.5

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Section: Formatting the Title Authors And Affiliationsmentioning

confidence: 99%

Developing of complex for hot plastic deformation modeling of steel type 20-30CrNiMoV for heavy forging

et al. 2017

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“…peak stress, steady state stress, etc. Although several researchers have modified this equation to incorporate the strain in order to predict the stress value for the entire strain range, [3][4][5][6][7][8] it was found that modification of the equation often has no physical significance as it involves curve fitting only. Another major limitation of the model is that it is too much material and deformation condition specific and that is why it is difficult to use for unknown steel grades.…”

Section: Constitutive Modelling Using Phenomenological Approachmentioning

confidence: 99%

Modelling hot strength behaviour of steel

Lodh

Biswas

Das

2014

Ironmaking & Steelmaking

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Modelling the hot strength behaviour of steel is very complicated because of the fact that the processing conditions in terms of strain, strain rate and temperature of deformation are very critical. This in turn will help to control the evolution of final microstructural constituents which in turn can also influence the processing conditions to a great extent. The composition of steel is another important variable which plays crucial role in determining the flow stress behaviour. There are some available models which can work to predict the flow stress behaviour at high temperature for different steel grades. However, these existing models are not robust enough to predict the flow stress behaviour irrespective of steel composition. Scope of the current work is put to fill up the gap of unavailability of generalised model of hot flow behaviour by developing a new model. The newly developed model was used for predicting the flow stress for different steel grades over a wide processing conditions and the outcomes were found to be in very good agreement (within ¡20 MPa) with the experimental results.

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“…In the past, several different test methods [1][2][3][4] have been adopted to obtain the basic flow stress information and several constitutive equations have been developed to use with the process models. Though some analytical models have been proposed [5][6][7][8][9] for describing the deformation behaviour, it is still largely the empirical and semi-empirical relationships that have been used t This paper is based mainly on a presentation made at the annual elM conference, Ottawa, August 1991. in the mathematical simulation, owing mainly to their simple and explicit nature [10][11][12][13][14][15][16][17]. However, the test data generated in each study have been limited owing to the particular test machine's capability.…”

Section: Deformationmentioning

confidence: 99%

Constitutive Relationships for Hot Deformation of A Carbon Steel: A Comparison Study of Compression Tests and Torsion Tests

Rao¹,

Hawbolt²,

McQueen³

et al. 1993

Canadian Metallurgical Quarterly

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A 0.34% carbon steel was subjected to hot working (800-1100°C) by Gleeble compression to 0.7 strain at strain rates of 0.1-8 S-I, cam plastometer compression to 0.4 strain at strain rates of 3.5-100 s-1 and torsion to fracture strains~8 at strain rates of 0.05-4 s-1. The compressive flow curves exhibited continual hardening towards saturation except at high temperatures or low strain rates where work softening finally occurred; in torsion, the curves exhibited the peak, softening and steady state characteristics of dynamic recrystallization. The sinh-Arrhenius constitutive equation was found suitable for describing the compression tests at a series of strain levels. The constants are power functions of strain with negative exponents; however, they differ for the two compression techniques as a result of anvil/ specimen contact friction in the Gleeble tests and the presence of a glass lubricant in the cam plastometer. Each set of constants can be employed to predict the flow curves of the other compression test with errors of only 7% as well as the stresses at the peak strains in torsion.Resume-Un acier 0.34% carbone a ete soumis a une deformation de 0.7 a chaud (800-1 100°C) lors d'une compression de Gleeble (e = 0.

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Modelling on flow stress of plain carbon steel at elevated temperatures

Cited by 30 publications

References 8 publications

Developing of complex for hot plastic deformation modeling of steel type 20-30CrNiMoV for heavy forging

Developing of complex for hot plastic deformation modeling of steel type 20-30CrNiMoV for heavy forging

Modelling hot strength behaviour of steel

Constitutive Relationships for Hot Deformation of A Carbon Steel: A Comparison Study of Compression Tests and Torsion Tests

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