scholarly journals Influence of Niobium on the Beginning of the Plastic Flow of Material during Cold Deformation

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Stoja Rešković ◽  
Ivan Jandrlić
Keyword(s):  
Plastic Flow ◽  
Deformation Zone ◽  
Microalloyed Steel ◽  
Cold Deformation ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Thermoelastic Effect ◽  
Niobium Microalloyed Steel ◽  
Thermographic Measurement ◽  
Lüders Band

Investigations were conducted on low-carbon steel and the steel with same chemical composition with addition of microalloying element niobium. While tensile testing was carried out, the thermographic measurement was tacking place simultaneously. A specific behavior of niobium microalloyed steel was noticed. Test results have shown that, in the elastic deformation region, thermoelastic effect occurs, which is more pronounced in niobium microalloyed steel. Start of plastic flow in steel which is not microalloyed with niobium begins later in comparison to the microalloyed steel, and it is conducted so that, at the point of maximum stress, deformation zone is formed within which stresses grow. In steel microalloyed with niobium after proportionality limit, comes the occurrence of the localized increase in temperature and the occurrence of Lüders band, which propagate along the sample forming a deformation zone.

Static Softening Behavior of Low Carbon High Niobium Microalloyed Steel

2020 ◽  
Vol 990 ◽  
pp. 36-43
Author(s):  
Dian Xiu Xia ◽  
Heng Ke Du ◽  
Xin En Zhang ◽  
Xiu Cheng Li ◽  
Ying Chao Pei
Keyword(s):  
Deformation Temperature ◽  
Static Recrystallization ◽  
Microalloyed Steel ◽  
Testing Machine ◽  
Low Carbon ◽  
High Deformation ◽  
Softening Behavior ◽  
Test Steel ◽  
Static Softening ◽  
Niobium Microalloyed Steel

The MMS-200 thermal simulation testing machine was used to study the static softening behavior of low carbon high niobium microalloyed steel. The effect of niobium to the static recrystallization softening behavior of the microalloy steel had been analyzed by establishing the kinetics model of static recrystallization and the micro-morphology of precipitates. The results indicated that: the static softening behavior of the tested steel significantly influenced by the deformation temperature and the interval pass time of the rolling processing. At relatively high deformation temperature and long interval pass time, the ratio of static softening was increased. Then the deformation temperature was lower to 950°C, and the static softening behavior of the test steel was ceased. But when the deformation temperature was higher than 1000°C, the static softening behavior of the test steel completely occurred. The activation energy of the test steel was 325·mol-1 by the established model calculated.

scholarly journals Interaction between Recrystallization and Precipitation during Multipass Rolling in a Low Carbon Niobium Microalloyed Steel.

2001 ◽  
Vol 41 (11) ◽  
pp. 1373-1382 ◽  
Author(s):  
R. Abad ◽  
A. I. Fernández ◽  
B. López ◽  
J. M. Rodriguez-Ibabe
Keyword(s):  
Microalloyed Steel ◽  
Low Carbon ◽  
Niobium Microalloyed Steel

Evolution of Macro-Scale Plastic Flow Localization of Tri-Layered Stainless Steel - Low Carbon Steel - Stainless Steel Metal with Digital Image Correlation Method

2016 ◽  
Vol 870 ◽  
pp. 60-65 ◽  
Author(s):  
S.A. Barannikova ◽  
Lev B. Zuev ◽  
A.V. Bochkareva ◽  
A.G. Lunev ◽  
Yu.V. Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Carbon Steel ◽  
Digital Image Correlation ◽  
Plastic Flow ◽  
Low Carbon Steel ◽  
Correlation Method ◽  
Image Correlation ◽  
Low Carbon ◽  
Localized Plastic Deformation

Evolution of localized plastic deformation in tri-layered metal material casting consistng of the working part (layer) from austenitic stainless steel and bearing part from low-carbon steel was investigated. The pictures of localization of the plastic flow during the process of uniaxial tension were obtained by means of the digital image correlation method (DIC). Using optical microscopy methods, the changes in the fracture surface were investigated. The deformation diagrams were examined for deformed samples of tri-layered metal. These were found to show all the plastic flow stages: the linear, parabolic and pre-failure stages would occur for the respective values of the exponent n from the Lüdwik-Holomon equation. The analysis of the plastic flow stages and localized plastic deformation parameters was performed.

scholarly journals Plastic flow and anisotropy of a low-carbon steel over a range of strain-rates

2018 ◽  
Vol 121 ◽  
pp. 157-171 ◽  
Author(s):  
Yannis P. Korkolis ◽  
Benjamin R. Mitchell ◽  
Michael R. Locke ◽  
Brad L. Kinsey
Keyword(s):  
Carbon Steel ◽  
Plastic Flow ◽  
Low Carbon Steel ◽  
Strain Rates ◽  
Low Carbon

Improvement of Mechanical Properties and Structure Modifications of Low Carbon Steel by Inoculations with Nano-Size Silicon Nitride

2017 ◽  
Vol 47 ◽  
pp. 24-32 ◽  
Author(s):  
Ahmed Shash ◽  
Mohamed K. El-Fawkhry ◽  
Sherif Ali Abd El Rahman ◽  
Iman S. Elmahallawi ◽  
Taha Mattar
Keyword(s):  
Mechanical Properties ◽  
Treatment Process ◽  
Adhesive Wear ◽  
Cold Deformation ◽  
Low Carbon Steel ◽  
Structural Steels ◽  
Low Carbon ◽  
Nano Size ◽  
Lamellar Cementite

AISI 1020 steel is considered to be one of the most applicable structural steels, in particular in the cold drawn form. Heating of this grade of steel prior to AC1 must have been applied to spheroidize the lamellar cementite, and consequently enhances the cold formability character of the steel. Si3N4 nanoinoculation of this grade of steel has been used in this study, where it is added to the molten steel, in order to avoid the high cost long term heat treatment process prior to cold deformation process. Optical microscopy and SEM have been used to evaluate the morphology of cementite after nanoinoculation process with Si3N4. Tensile properties of nanoinoculated steels have been investigated. Finally, wear adhesive resistance of investigated samples has been evaluated. The obtained results showed a great enhancement in the mechanical properties, strength, ductility and adhesive wear resistance, as a result of the nucleation of cementite into a new spheroidal phase and grain refinement by Si3N4 inoculation and allow usage of AISI 1020 steels inoculated by nanoinoculant Si3N4 in further technological applications.

Cold Deformation Effect on Microstructure and on the Hydrogen Permeability of Low Carbon Al-Killed Steels

2010 ◽  
Vol 659 ◽  
pp. 7-12 ◽  
Author(s):  
Fábián Enikő-Réka
Keyword(s):  
Cold Rolling ◽  
Hydrogen Permeability ◽  
Cold Deformation ◽  
Low Carbon Steel ◽  
Rolling Process ◽  
Low Carbon ◽  
Deformation Degree ◽  
Steel Sheets ◽  
Texture Modification ◽  
Hot Rolled

The cold rolling effect on the hydrogen permeability (TH value) and on the microstructure have been studied on samples prepared from Al-killed low carbon steel sheets after several cold rolling levels. The TH values of the hot rolled strips were very short, but due to the cold rolling increase exponentially. The fragmentation of large cementite phase has a significant influence on the evolution of texture during the cold rolling process. The cold deformation effects on the TH value were studied on four annealed enamelling grade steel sheets also. Depending on the carbides sizes and carbides position in ferrite grains after annealing the TH values increase or decrease after low deformation degrees, due to the steel texture modification and dislocation character. Dislocations act as major tripping site for hydrogen, if deformation degree is higher than 30%.

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