Distribution of Stress in Deformation Zone of Niobium Microalloyed Steel

Jandrlić, Ivan; Rešković, Stoja; Brlić, Tin

doi:10.1007/s12540-018-0099-2

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…At the moment of reaching the proportionality limit Rp it was found that there were no temperature changes through the deformation zone, Figure 2. This is confirmed by the results obtained in the research [8].…”

Section: Figure 1 Dependence Stress-strain In Low Carbon Steelsupporting

confidence: 89%

“…Another research indicates that the temperature change, measured by thermography, showed that it is possible to monitor and determine the temperature change distribution, i.e. stress distribution in low carbon steels with the addition and without microalloying element niobium [8]. In the same research, the possibility of quantifying the amount of temperature change during cold deformation at any point of the deformation zone was determined.…”

Section: Introductionmentioning

confidence: 99%

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Stress distribution at different deformation degrees in low carbon steel during cold deformation

et al. 2022

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The temperature change, i.e. stresses of low carbon steel during the cold deformation process was investigated in this study. During static tensile test, temperature changes were examined using thermography at different deformation degrees. It was found that there are temperature changes in the deformation zone during the cold deformation. The increase in temperature changes in the deformation zone during cold deformation occurs with an increase in the deformation degree. The largest localization of temperature change was measured at the moment of the test sample fracture when the maximum temperature change was 8.45 °C. A higher amount of temperature change of 5.39 °C was determined at tensile strength compared to the proportionality limit amount of -0.97 °C. It was found that there are differences between the amounts of temperature changes in the range from 0.87 °C to 1.91 °C with increasing of deformation degree of the tested steel. Calculated stress amounts proved and show the tendency that stress amounts increase as the temperature change increases in low carbon steel by increasing of deformation degree during cold deformation. It was determined deviations of the calculated stress amounts due to using the mathematical model for low carbon with niobium at the start of plastic flow.

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Section: Figure 1 Dependence Stress-strain In Low Carbon Steelsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Stress distribution at different deformation degrees in low carbon steel during cold deformation

et al. 2022

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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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“…The tensile test was carried out at a quasi-static strain rate of 1 × 10 −3 s −1 , using a universal testing machine (UTM, model 1361, Instron Co., Norwood, MA, USA). To measure highly precise tensile strain, a digital image correlation (DIC, ARAMIS 5M, GOM mbH, Germany) was conducted in parallel with the tensile test, after patterning black and white speckles on the surface of each tensile sample [23]. The sample photographs after the tensile tests are represented in Figure S1a in the Supplementary Material.…”

Section: Mechanical Testingmentioning

confidence: 99%

Effect of Processing Route on Microstructure and Mechanical Properties in Single-Roll Angular-Rolling

et al. 2020

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This paper reports the effect of the processing route on the microstructure and mechanical properties in the pure copper sheets processed by single-roll angular-rolling (SRAR). The SRAR process was repeated up to six passes in two processing routes, called routes A and C in equal-channel angular pressing. As the number of passes increased, the heterogeneous evolution of hardness and microstructural heterogeneities between the core and surface regions gradually became intensified in both processing routes. In particular, route A exhibited more prominent partial grain refinement and dislocation localization on the core region than route C. The finite element analysis revealed that the intense microstructural heterogeneities observed in route A were attributed to effective shear strain partitioning between the core and surface regions by the absence of redundant strain. On the other hand, route C induced reverse shearing and cancellation of shear strain over the entire thickness, leading to weak shear strain partitioning and delayed grain refinement. Ultimately, this work suggests that route A is the preferred option to manufacture reverse gradient structures in that the degree of shear strain partitioning and microstructural heterogeneity between the core and surface regions is more efficiently intensified with increasing the number of passes.

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Distribution of Stress in Deformation Zone of Niobium Microalloyed Steel

Cited by 7 publications

References 10 publications

Stress distribution at different deformation degrees in low carbon steel during cold deformation

Stress distribution at different deformation degrees in low carbon steel during cold deformation

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

Effect of Processing Route on Microstructure and Mechanical Properties in Single-Roll Angular-Rolling

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