Influence of strain rate on stress changes during Lüders bands formation and propagation

Brlić, Tin; Rešković, Stoja; Jandrlić, Ivan; Skender, Filip

doi:10.1088/1757-899x/461/1/012007

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…These inhomogeneous deformations (stress-strain curve) are related to the appearance of Lüders bands (Figure 11). Specifically, Lüders bands are localized regions of plastic deformation that are often observed in cold-rolled low-carbon steel following the appearance after the limit of proportionality [34][35][36][37][38][39]. When the interaction energy between dislocations and easily diffused solute atoms (C, N, and Nb) is strong, they gather around dislocations to form Cottrell's atmospheres.…”

Section: Resultsmentioning

confidence: 99%

The Interdependence of the Degree of Precipitation and Dislocation Density during the Thermomechanical Treatment of Microalloyed Niobium Steel

Rešković¹,

Benić²,

Lovrenić-Jugović³

2020

Metals

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In this paper, thermomechanical processing of niobium microalloyed steel was performed with the purpose of determining the interaction between niobium precipitates and dislocations, as well as determining the influence of the temperature of final deformation on the degree of precipitation and dislocation density. Two variants of thermomechanical processing with different final rolling temperatures were carried out. Samples were studied using electrochemical isolation with an atomic absorption spectrometer, transmission electron microscopy, X-ray diffraction analysis, and universal tensile testing with a thermographic camera. The results show that the increase in the density of dislocations before the onset of intense precipitation is insignificant because the recrystallization process takes place simultaneously. It increases with the onset of strain-induced precipitation. In this paper, it is shown that niobium precipitates determine the density of dislocations. The appearance of Lüders bands was noticed as a consequence of the interaction between niobium precipitates and dislocations during the subsequent cold deformation. In both variants of the industrial process performed on the cold deformed strip, Lüders bands appeared.

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Section: Resultsmentioning

confidence: 99%

The Interdependence of the Degree of Precipitation and Dislocation Density during the Thermomechanical Treatment of Microalloyed Niobium Steel

Rešković¹,

Benić²,

Lovrenić-Jugović³

2020

Metals

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“…The macroscopic properties of the composite materials are converted from the material properties of the components by homogenisation techniques, for example, in this case, are taken the parameters of the basic material because the manufacturer did not provide sufficient documentation. The thermal properties of the Onyx are:  density ρ = 1.18 g/cm 3  isotropic thermal conductivity κ = 0.23 W/(m.K)  specific heat cp = 1510 J/(kg.K) Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…Using a camera in the 3-5 um (MWIR) wavelength range with an InSb detector, it is possible to detect events with microsecond integration times. This can be used to detect the occurrence of fast events, for example, Lüders bands [1][2][3], when synchronizing the camera with exciting harmonic loading events, which is useful in thermoelastic analysis (TSA) [4,5], in determining the dissipative energy estimation in fatigue tests [6,7,8], determining crack size [9], in the analysis of vibration and determination of resonance frequencies and modal shapes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Processing of Results From a Thermal Fem Analysis Using the Lock-in Method and Comparison With Experiment

Štalmach¹,

Dekýš²,

Novák³

et al. 2019

SJSUT.ST

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This article dealt with the comparison of results obtained from an experiment and from the numerical thermal FEM analysis. Sample with defects were printed on a 3D printer. A thermal wave from the halogen lamp to excite the front surface of the sample was used in the next step and the response was measured by a thermal camera. After processing the data in the software DisplayIMG, a phase image was created representing the 2D image of the material at a certain depth under the surface of the model. Lock-in method was applied to the results from the numerical thermal FEM analysis and the phase image was created. The programs code were created in MATLAB for a 4 points, multiple points and differential lockin method which were compared with the results from the experiment.

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Hydrogen induced activation of cross slip in Ni-based single crystal superalloy

Yun,

Jeon,

Dao

et al. 2024

Materials Science and Engineering: A

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Influence of strain rate on stress changes during Lüders bands formation and propagation

Cited by 3 publications

References 5 publications

The Interdependence of the Degree of Precipitation and Dislocation Density during the Thermomechanical Treatment of Microalloyed Niobium Steel

The Interdependence of the Degree of Precipitation and Dislocation Density during the Thermomechanical Treatment of Microalloyed Niobium Steel

Processing of Results From a Thermal Fem Analysis Using the Lock-in Method and Comparison With Experiment

Hydrogen induced activation of cross slip in Ni-based single crystal superalloy

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