Research on low-carbon diffusion considering the game among enterprises in the complex network context

2019 ◽  
Vol 210 ◽  
pp. 1-11 ◽  
Author(s):  
Lu Wang ◽  
Junjun Zheng
Keyword(s):  
Complex Network ◽  
Carbon Diffusion ◽  
Low Carbon

Modeling austenite–ferrite transformation in low carbon steel using the cellular automaton method

2004 ◽  
Vol 19 (10) ◽  
pp. 2877-2886 ◽  
Author(s):  
Y.J. Lan ◽  
D.Z. Li ◽  
Y.Y. Li
Keyword(s):  
Carbon Steel ◽  
Cellular Automaton ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Low Carbon Steel ◽  
Carbon Diffusion ◽  
Cellular Automaton Model ◽  
Low Carbon ◽  
Austenite Grain ◽  
Ferrite Transformation

Austenite–ferrite transformation at different isothermal temperatures in low carbon steel was investigated by a two-dimensional cellular automaton approach, which provides a simple solution for the difficult moving boundary problem that governs the ferrite grain growth. In this paper, a classical model for ferrite nucleation at austenite grain boundaries is adopted, and the kinetics of ferrite grain growth is numerically resolved by coupling carbon diffusion process in austenite and austenite–ferrite (γ–α) interface dynamics. The simulated morphology of ferrite grains shows that the γ–α interface is stable. In this cellular automaton model, the γ–α interface mobility and carbon diffusion rate at austenite grain boundaries are assumed to be higher than those in austenite grain interiors. This has influence on the morphology of ferrite grains. Finally, the modeled ferrite transformation kinetics at different isothermal temperatures is compared with the experiments in the literature and the grid size effects of simulated results are investigated by changing the cell length of cellular automaton model in a set of calculations.

scholarly journals A study of isochronal austenitization kinetics in a low carbon steel

2014 ◽  
Vol 67 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Maximiano Maicon Batista Lopes ◽  
André Barros Cota
Keyword(s):  
Carbon Steel ◽  
Heating Rate ◽  
Low Carbon Steel ◽  
Carbon Diffusion ◽  
Austenite Formation ◽  
Low Carbon ◽  
Heating Rates ◽  
Initial Microstructure ◽  
Ferrite Structure ◽  
Kinetics Of

The austenite formation under isochronal conditions in Nb microalloyed low carbon steel was studied by means of dilatometric analysis and the data was adjusted to the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation, for different heating rates and for three initial microstructures. It was shown that the kinetics of austenitization of a pearlite+ferrite structure is faster than that of martensite (tempered martensite) at a heating rate of 0.1ºC/s. For heating rates higher than 0.1ºC/s, the kinetics of austenitization of a martensite structure is faster than of pearlite+ferrite one. The K parameter of the JMAK equation increases with the heating rate for the three previous microstructures and it is greater for the initial microstructure composed of ferrite+pearlite. At lower heating rates, the formation of austenite in this steel is controlled by carbon diffusion, independently of the initial microstructure. At higher heating rates, the formation of austenite from an initial microstructure composed of pearlite and ferrite is controlled by interface-controlled transformation.

scholarly journals Carbon Diffusion on the Surface of Low Carbon Mild Steel during Its-Annealing

1974 ◽  
Vol 25 (3) ◽  
pp. 131-138 ◽  
Author(s):  
Iwao YANO ◽  
Keiji ARIGA ◽  
Kenichi ARASE ◽  
Kinji SAIJO
Keyword(s):  
Mild Steel ◽  
Carbon Diffusion ◽  
Low Carbon

scholarly journals Molecular Dynamics Study of Carbon Diffusion in Austenite

2006 ◽  
Vol 258-260 ◽  
pp. 253-258
Author(s):  
Alexander V. Evteev ◽  
Elena V. Levchenko ◽  
Irina V. Belova ◽  
Graeme E. Murch
Keyword(s):  
Molecular Dynamics ◽  
Transition Probabilities ◽  
Carbon Diffusion ◽  
Dynamics Simulation ◽  
Low Carbon ◽  
Frequency Model ◽  
Jump Frequencies ◽  
Experimental Data Analysis ◽  
Molecular Dynamics Results

The mmolecular dynamics method is applied to investigate carbon interstitial diffusion in austenite at low carbon content. An approximation that carbon atoms can interact with each other only indirectly (via neighbouring iron atoms) is used. Sets of Arrhenius parameters of interstitial carbon jump frequencies identified by the four-frequency model are determined. Comparison of the molecular dynamics results with experimental data analysis in the context of the four-frequency model is performed. It is shown that the four-frequency model may not be adequate to describe the carbon diffusion process. To improve the analytical model the specific role of the transition probabilities during association and dissociation of the first nearest neighbour carbon pairs through the second neighbour sites should be considered. The direct repulsion between the carbon first neighbour positions should be also taken into account in molecular dynamics simulation.

scholarly journals La educación en tiempos de cambio climático: Facilitar el aprendizaje para construir una cultura de cuidado del clima

2016 ◽  
pp. 65
Author(s):  
Francisco Heras Hernández
Keyword(s):  
Climate Change ◽  
Social Change ◽  
Complex Network ◽  
Global Climate ◽  
Educational Institutions ◽  
Low Carbon ◽  
Climate Risks ◽  
Educational Challenges ◽  
Realistic Perception

Climate change presents significant educational challenges: it is necessary to know about its causes, to recognise the roots of the problem and to be aware of its consequences. This is necessary to build a more realistic perception of climate risks and better understand our vulnerabilities. But it is especially important to know about the solutions; urgent training is needed to build a «low-carbon» culture to prevent dangerous interference with the global climate. Educational institutions – both formal and informal – must consider their contribution to these needs for knowledge and social change, because climate change will impact our future heavily and because everyone plays a role in the complex network of responsibilities that fuel it.  

scholarly journals ANALISA KEKERASAN DAN STRUKTUR MIKRO PADA BAJA AISI 1018 AKIBAT PROSES PACK CARBURIZING DENGAN VARIASI KONSENTRASI SERBUK CANGKANG KEONG EMAS

2011 ◽  
Vol 1 (1) ◽  
Author(s):  
Achmad Zainuri ◽  
Paryanto Dwi Setyawan ◽  
Prayuda Atmam
Keyword(s):  
Heat Treatment ◽  
Low Carbon Steel ◽  
Hardness Test ◽  
Carbon Diffusion ◽  
Low Carbon ◽  
Steel Cylinder ◽  
Microstructure Observation ◽  
Material Hardness ◽  
Powder Addition ◽  
Shell Powder

This research to investigate the effect of Pomacea Canalikulata Lamarck powder addition in the process of carburization box to physical (microstructure) and mechanical properties (hardness test) of AISI 1018 after heat treatment. In this research used a material of low carbon steel cylinder (AISI 1018). The process of making the specimen is done with to cut into several pieces, cutting done to ease in placing the specimen in the carburizing box, then wood charcoal powder and shell powder were weighed in accordance with the desired composition by mixing powder of 5 wt%, 10 wt%, and 15 wt%. The specimen was done heat treatment at a temperature of 9500C with the holding time at 2, 4 and 6 hours. Then, the specimen was done the Vickers hardness test, microstructure and composition test. From this research it can be concluded that the highest hardness value was obtained at 15 wt% addition of shell powder it was 262.26 kg/mm2 and the initial material hardness value was 144.08 kg/mm2. From microstructure observation and composition test show that it subjected surface hardening because carbon diffusion into specimen.

Sign in / Sign up

Export Citation Format

Share Document