Study of the Effects of Micro- and Nanolayered Structures on Mechanical Response of Microalloyed Steels

Majta, Janusz; Muszka, Krzysztof; Madej, Łukasz; Kwiecień, Marcin; Graca, P.

doi:10.13189/mst.2015.030410

Cited by 3 publications

(2 citation statements)

References 16 publications

(18 reference statements)

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“…Kinetic analysis. The flow stress of materials during high temperature deformation is related to deformation temperature, strain rate and strain (a general material flow stress model ) [10]. The constitutive equation to describe the deformation behaviour at elevated temperatures is generally as follows:…”

Section: Resultsmentioning

confidence: 99%

Processing Maps of the Ti-6Al-4V Alloy in a Forging Process Design

Łukaszek-Sołek

Krawczyk

2015

KEM

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The paper presents the results of a complex study of the Ti-6Al-4V alloy, conducted with the application of the dynamic material modelling (DMM) method, in a wide range of temperatures, strain rates and strains. A compression test was carried out in a wide range of temperatures (800 – 1100°C) and strain rates (0.01 – 100 s-1), up to the constant final true strain value of 0.9. The obtained stress-strain curves were a basis for determining deformation activation energy with the use of an Arrhenius plot and a correlation between the Zener-Hollomon parameter and flow stress, for which the constitutive equation proposed by Sellars was used. The power dissipation efficiency parameter was calculated. The maps of power dissipation as the function of temperature and strain rate were plotted in the form of the isoclines of the power dissipation efficiency parameter expressed in %. The processing maps exhibited the range of occurrence and recrystallization of the primary α phase, the degree of the β phase recrystallization progress against the background of the process deformation windows and instability flow domain. An analysis of the influence of process parameters up on the microstructure and hardness changes was conducted.

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Section: Resultsmentioning

confidence: 99%

Processing Maps of the Ti-6Al-4V Alloy in a Forging Process Design

Łukaszek-Sołek

Krawczyk

2015

KEM

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“…Parameters C x and n have been identified based on the stress-strain (16) X s = a(τ − τ 0 ), (4), ( 5), ( 8), ( 9), curve from the experiment using the inverse method. The precipitate volume fraction and their mean diameter were identified based on the transmission electron microscopy (TEM) analysis presented in the previous work [24]. The above modified model has been implemented to Abaqus CAE as a subroutine.…”

Section: (11) ̇Wmentioning

confidence: 99%

A dislocation density-based model for the work hardening and softening behaviors upon stress reversal

Lisiecka-Graca

Bzowski

Majta

et al. 2021

Archiv.Civ.Mech.Eng

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The mechanical behaviours of microalloyed and low-carbon steels under strain reversal were modelled based on the average dislocation density taking into account its allocation between the cell walls and cell interiors. The proposed model reflects the effects of the dislocations displacement, generation of new dislocations and their annihilation during the metal-forming processes. The back stress is assumed as one of the internal variables. The value of the initial dislocation density was calculated using two different computational methods, i.e. the first one based on the dislocation density tensor and the second one based on the strain gradient model. The proposed methods of calculating the dislocation density were subjected to a comparative analysis. For the microstructural analysis, the high-resolution electron backscatter diffraction (EBSD) microscopy was utilized. The calculation results were compared with the results of forward/reverse torsion tests. As a result, good effectiveness of the applied computational methodology was demonstrated. Finally, the analysis of dislocation distributions as an effect of the strain path change was performed.

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Selected Problems of the Microstructure Evolution During Microalloyed Steel Wire Rod Production Process

Kwiecień

Graca

Muszka

et al. 2017

Archives of Metallurgy and Materials

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In the present study, we have discussed the selected problems of microstructure development during the whole manufacturing process, i.e. continuous casting, thermomechanical processing, and cold metal forming of the microalloyed steels wires. In the investigated steels, the microstructure development was controlled by the history of deformation and by the effects of microalloying elements, mostly Nb, Ti, and B. It has been concluded that obtained in the ultrafine grained microalloyed steel wires mechanical properties were first of all resulting from specific structural composition and grain refinement. Additionally, it has been proven that austenite grain refinement, that increases nucleation rate during the austenite-to-ferrite phase transformation, as a result of the thermomechanical processing, are very beneficial from point of view of the final mechanical properties. This problem starts to be very important when the microalloyed steel products are subjected to severe plastic deformation, as it has been shown discussed in the present work for combined processes of wire drawing and wire flattening.

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Study of the Effects of Micro- and Nanolayered Structures on Mechanical Response of Microalloyed Steels

Cited by 3 publications

References 16 publications

Processing Maps of the Ti-6Al-4V Alloy in a Forging Process Design

Processing Maps of the Ti-6Al-4V Alloy in a Forging Process Design

A dislocation density-based model for the work hardening and softening behaviors upon stress reversal

Selected Problems of the Microstructure Evolution During Microalloyed Steel Wire Rod Production Process

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