Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Wojtacha, Anna; Opiela, M.

doi:10.12913/22998624/142473

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…For example, Figure 6 shows the structures of the test steel revealed after the continuous compression of the samples at a temperature of 1100 °C with the rate of 1 s −1 . The samples of the tested steel, hardened in water after deformation with a value of 0.2 and 0.69, showed a martensitic structure with a slight indication of retained austenite, the presence of which was confirmed by the authors in previous works [ 39 , 40 ]. As expected, the deformed samples with a higher degree of deformation showed greater fragmentation of the structure ( Figure 6 b,d).…”

Section: Resultssupporting

confidence: 79%

Hot Working Behavior in Multiphase Steel with Ti and V

Wojtacha

Opiela

2022

Materials

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This study investigated the effect of hot working conditions on changes in yield stress and the softening degree in the newly developed multiphase steel with Ti and V microadditions. The research was performed on the GLEEBLE 3800 thermomechanical simulator. In order to determine the σ-ε curves, continuous compression tests were carried out. The samples were plastically deformed at temperatures from 900 °C to 1100 °C at the rate of 0.1 s−1, 1 s−1 and 10 s−1. The activation energy of the plastic deformation was 375 kJ·mol−1. The analysis of the shape and course of the curves indicated that the decrease in strain hardening was mainly the result of the continuous dynamic recrystallization process. Two-stage compression with isothermal holding of the samples was also carried out between the two stages of deformation lasting from 1 s to 50 s. The structure of primary austenite was generated using the ARPGE software. The different size of austenite grain is the result of various thermally activated processes—when increasing the strain rate from 0.1 s−1 to 10 s−1, the average grain size of the primary austenite decreases from approx. 16 µm to approx. 6 µm. The time t0.5 needed to form 50% of the austenite fraction recrystallized at 1100 °C is approx. 4 s and extends to approx. 10 s with the reduction in the plastic deformation temperature to 900 °C. The time of complete austenite recrystallization tR, which varies from approx. 50 s to approx. 90 s in the tested temperature range, lengthens even more. The obtained results make it possible to develop thermomechanical treatment technology for the production of forgings from the tested multiphase steel.

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Section: Resultssupporting

confidence: 79%

Hot Working Behavior in Multiphase Steel with Ti and V

Wojtacha

Opiela

2022

Materials

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“…Retained austenite was revealed by etching the sample with Klemm's reagent staining it white. The presence of this phase was confirmed by the authors in [16,18]. As expected, the deformed samples with a higher degree of deformation show greater fragmentation of the structure.…”

Section: Resultssupporting

confidence: 69%

“…Obtaining the desired multi-phase structure with the correct proportions of individual components requires the knowledge of the diagrams of austenite phase transformations. The authors published the results of these studies in earlier works [15,16]. The aim of this work is to investigate the influence of temperature and deformation rate on hot-deformation behavior of the newly developed multi-phase steel.…”

Section: Introductionmentioning

confidence: 99%

hot plastic deformation behavior of new-developed multi-phase steel

Wojtacha

Opiela

2022

METAL 2022 Conference Proeedings

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The paper presents the results of the effect of deformation parameters on the hot-deformation behavior of the newly developed multi-phase steel assigned for production of forged machine parts. Continuous and interrupted compression tests of the samples after the given deformation were carried out with the use of the Gleeble 3800 thermomechanical simulator. The samples were tested in the temperature range from 900°C to 1100°C at the rate of 0.1s -1 and 1s -1 . Basing on the analysis of the form and the course of curves obtained in the compression test, it was found that in the studied range of parameters of hot plastic deformation, the decrease of strain hardening of studied steel is caused by the process of dynamic recrystallization. This is also confirmed by calculation results of activation energy of plastic deformation process. Executed hot compression tests will contribute to establishing conditions of forging of newly developed multi-phase steel with the method of thermo-mechanical treatment.

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“…The first ones enable to describe the behaviour of materials under loading in macro scale only without considering the micro-mechanism occurring in a material during deformation which is the goal of unified plasticity approaches. The change of a material microstructure gives the full explanation of plastic deformation process [1][2]. In turns, unified plasticity models assume not only the change of the material shape under loading in a macro scale, but also the change of its microstructure, strain hardening and anisotropy caused by the plastic deformation mechanisms, e.g.…”

Section: Introductionmentioning

confidence: 99%

An Elastic-Plastic Analysis of Polycrystalline Structure Using Crystal Plasticity Modelling – Theory and Benchmark Tests

Wójcik¹,

Skrzat²

2022

Adv. Sci. Technol. Res. J.

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Numerical simulations of tension and shear tests for a polycrystalline, anisotropic material were performed using crystal plasticity theory. The slip was considered here as the main mechanism of plastic deformation. Constitutive equations to describe the elastic-plastic deformation caused by the slip are presented. The generation and meshing of various shapes geometries (cubic and paddy shapes) with randomly-orientated grains by means of open source software NEPER program was shown. The Voronoi tessellation was used in order to include morphological properties of a crystalline material. The selected results of elastic-plastic analyses (stress, strain distributions and the macroscopic stress-strain resulting from homogenization) are presented here. The results obtained show the non-uniform distribution of stress and strain for different grains associated with their crystal orientation. The crystal plasticity finite element modelling of materials subjected to plastic deformation is important for microstructure-based mechanical predictions, as well as for the engineering design and to perform simulations involving not only the change of a material's shape at a macro level but also the phenomena occurring in material in a micro-scale.

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Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Cited by 3 publications

References 17 publications

Hot Working Behavior in Multiphase Steel with Ti and V

Hot Working Behavior in Multiphase Steel with Ti and V

hot plastic deformation behavior of new-developed multi-phase steel

An Elastic-Plastic Analysis of Polycrystalline Structure Using Crystal Plasticity Modelling – Theory and Benchmark Tests

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